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Re: AAC not played - No Sound output

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ak.ashwini

Re: AAC not played - No Sound output

Hi All,

I am adding the ADTS header infront of the raw AAC frame and decoding it.

Now I see that the frames are being written to Alsasink, but there is no sound output actually.

The "snd_pcm_writei" function in "gst_alsasink_write" returns same number as input. Can someone point me in the right direction to get the Audio output.

Regards,

Ashwini

On Fri, Jul 22, 2011 at 11:07 AM, Balakrishnan Natarajan <[hidden email]> wrote:

The Elementary AAC can be playable only if it contains ADTS header.

So verify if your demuxer gives you the Elementary AAC stream with ADTS header.

You can verify this by playing with tools like foobar or winamp.

Once you have verified this may be you need to aacparse plugin to extract the ADTS header and pass it to the ffdec_aac plugin
through the codec-data caps field while negotiation.

Regards
Bala

On Thu, Jul 21, 2011 at 11:44 AM, <[hidden email]> wrote:

Send gstreamer-devel mailing list submissions to

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When replying, please edit your Subject line so it is more specific
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Today's Topics:

1. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
2. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
3. Re: AAC not played - Error from decoder (ffdec_aac)
(Ashwini Sharma)

----------------------------------------------------------------------

Message: 1
Date: Thu, 21 Jul 2011 08:23:47 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVYk7woyv+sO3DQcu3W86EkysYwoY60HhX=Rm6TA=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Yes you can insert missing header to raw aac data by writing your own
plugin, and place it before decoder plugin. But you need to have certain
information for header e.g. sampling frequency, channels, profile etc , and
all this you suppose to get from demuxer.

On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:

> HI Sudarshan,
>
> Adding aacparse didn't help. I get the parse error from aacparse.
>
> In my case, the file is read and demuxed by an application, which then
> gives the audio stream data to my pipeline (which consists of aapsrc !
> decoder ! alsasink ) for decoding and rendering.
>
> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
> your inputs, but to no results.
>
> Can't there be case that we provide the missing header data to ffdec_aac
> thru some means..... any inputs please.
>
> Rgds,
> Ashwini
>
> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> If you want to play it dynamically then you don't need to mux it again,
>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>
>>
>>
>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> Hi Sudarshan,
>>>
>>> Thanks for your input.
>>>
>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>> saving it into file.
>>>
>>> Like mux the incoming AAC data buffer and then decode it at the same
>>> time?
>>>
>>> rgds,
>>> -Ashwini
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>>
>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>> thats why you get that error message.
>>>>
>>>> To get the correct playable file, you again need to mux this raw aac
>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>> you need to have qtdemux in your pipeline if you don't use
>>>> decodebin2/playbin2.
>>>>
>>>> I hope this will help you.
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <[hidden email]
>>>> > wrote:
>>>>
>>>>> Hi All,
>>>>>
>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>> an error "FFMpeg can not decode AAC data"
>>>>>
>>>>> The details are as follows:
>>>>>
>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>
>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>
>>>>>
>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>> Someone please provide your inputs in getting it to play.
>>>>>
>>>>> Any help is greatly appreciated.
>>>>>
>>>>> -Ashwini
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 2
Date: Thu, 21 Jul 2011 09:09:18 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVbocRsfvXpG+ZO2sBODaLoouU3a=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Or you can do same in your application also, then no need to write a
plugin.

On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht
<[hidden email]>wrote:

> Yes you can insert missing header to raw aac data by writing your own
> plugin, and place it before decoder plugin. But you need to have certain
> information for header e.g. sampling frequency, channels, profile etc , and
> all this you suppose to get from demuxer.
>
>
>
>
> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>
>> HI Sudarshan,
>>
>> Adding aacparse didn't help. I get the parse error from aacparse.
>>
>> In my case, the file is read and demuxed by an application, which then
>> gives the audio stream data to my pipeline (which consists of aapsrc !
>> decoder ! alsasink ) for decoding and rendering.
>>
>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>> your inputs, but to no results.
>>
>> Can't there be case that we provide the missing header data to ffdec_aac
>> thru some means..... any inputs please.
>>
>> Rgds,
>> Ashwini
>>
>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>> [hidden email]> wrote:
>>
>>> If you want to play it dynamically then you don't need to mux it again,
>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>
>>>> Hi Sudarshan,
>>>>
>>>> Thanks for your input.
>>>>
>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>> saving it into file.
>>>>
>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>> time?
>>>>
>>>> rgds,
>>>> -Ashwini
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>> [hidden email]> wrote:
>>>>
>>>>>
>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>> thats why you get that error message.
>>>>>
>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>> decodebin2/playbin2.
>>>>>
>>>>> I hope this will help you.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>>> an error "FFMpeg can not decode AAC data"
>>>>>>
>>>>>> The details are as follows:
>>>>>>
>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>
>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>>
>>>>>>
>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>
>>>>>> Any help is greatly appreciated.
>>>>>>
>>>>>> -Ashwini
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>>
>>>>> Sudarshan Bisht
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Sudarshan Bisht
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 3
Date: Thu, 21 Jul 2011 11:44:37 +0530
From: Ashwini Sharma <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Hi,

Can you please tell me how to contruct the header from the given data, i.e.
sampling frequency, channels, profile etc

Thanks,
Ashwini

On Thu, Jul 21, 2011 at 11:39 AM, Sudarshan Bisht <[hidden email]
> wrote:

> Or you can do same in your application also, then no need to write a
> plugin.
>
>
>
> On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> Yes you can insert missing header to raw aac data by writing your own
>> plugin, and place it before decoder plugin. But you need to have certain
>> information for header e.g. sampling frequency, channels, profile etc , and
>> all this you suppose to get from demuxer.
>>
>>
>>
>>
>> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> HI Sudarshan,
>>>
>>> Adding aacparse didn't help. I get the parse error from aacparse.
>>>
>>> In my case, the file is read and demuxed by an application, which then
>>> gives the audio stream data to my pipeline (which consists of aapsrc !
>>> decoder ! alsasink ) for decoding and rendering.
>>>
>>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>>> your inputs, but to no results.
>>>
>>> Can't there be case that we provide the missing header data to ffdec_aac
>>> thru some means..... any inputs please.
>>>
>>> Rgds,
>>> Ashwini
>>>
>>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>> If you want to play it dynamically then you don't need to mux it again,
>>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>>
>>>>> Hi Sudarshan,
>>>>>
>>>>> Thanks for your input.
>>>>>
>>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>>> saving it into file.
>>>>>
>>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>>> time?
>>>>>
>>>>> rgds,
>>>>> -Ashwini
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>>
>>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>>> thats why you get that error message.
>>>>>>
>>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>>> decodebin2/playbin2.
>>>>>>
>>>>>> I hope this will help you.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>>> [hidden email]> wrote:
>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i
>>>>>>> get an error "FFMpeg can not decode AAC data"
>>>>>>>
>>>>>>> The details are as follows:
>>>>>>>
>>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>>
>>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works
>>>>>>> fine.
>>>>>>>
>>>>>>>
>>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>>
>>>>>>> Any help is greatly appreciated.
>>>>>>>
>>>>>>> -Ashwini
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> gstreamer-devel mailing list
>>>>>>> [hidden email]
>>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Regards,
>>>>>>
>>>>>> Sudarshan Bisht
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
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_______________________________________________
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[hidden email]
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End of gstreamer-devel Digest, Vol 6, Issue 50
**********************************************

--
- bala

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

Sudarshan Bisht

Re: AAC not played - No Sound output

Did you try dumping PCM samples to a file using filesink and playing through some tool ? If that plays that means at least the data what you are getting out of decoder plugin is correct.
It may be possible that you need audioconvert/audioresample before alsasink.

On Mon, Jul 25, 2011 at 3:51 PM, Ashwini Sharma <[hidden email]> wrote:

Hi All,

I am adding the ADTS header infront of the raw AAC frame and decoding it.

Now I see that the frames are being written to Alsasink, but there is no sound output actually.

The "snd_pcm_writei" function in "gst_alsasink_write" returns same number as input. Can someone point me in the right direction to get the Audio output.

Regards,
Ashwini

On Fri, Jul 22, 2011 at 11:07 AM, Balakrishnan Natarajan <[hidden email]> wrote:

The Elementary AAC can be playable only if it contains ADTS header.

So verify if your demuxer gives you the Elementary AAC stream with ADTS header.

You can verify this by playing with tools like foobar or winamp.

Once you have verified this may be you need to aacparse plugin to extract the ADTS header and pass it to the ffdec_aac plugin
through the codec-data caps field while negotiation.

Regards
Bala

On Thu, Jul 21, 2011 at 11:44 AM, <[hidden email]> wrote:

Send gstreamer-devel mailing list submissions to

[hidden email]

To subscribe or unsubscribe via the World Wide Web, visit

http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
or, via email, send a message with subject or body 'help' to
[hidden email]

You can reach the person managing the list at
[hidden email]

When replying, please edit your Subject line so it is more specific
than "Re: Contents of gstreamer-devel digest..."

Today's Topics:

1. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
2. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
3. Re: AAC not played - Error from decoder (ffdec_aac)
(Ashwini Sharma)

----------------------------------------------------------------------

Message: 1
Date: Thu, 21 Jul 2011 08:23:47 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVYk7woyv+sO3DQcu3W86EkysYwoY60HhX=Rm6TA=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Yes you can insert missing header to raw aac data by writing your own
plugin, and place it before decoder plugin. But you need to have certain
information for header e.g. sampling frequency, channels, profile etc , and
all this you suppose to get from demuxer.

On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:

> HI Sudarshan,
>
> Adding aacparse didn't help. I get the parse error from aacparse.
>
> In my case, the file is read and demuxed by an application, which then
> gives the audio stream data to my pipeline (which consists of aapsrc !
> decoder ! alsasink ) for decoding and rendering.
>
> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
> your inputs, but to no results.
>
> Can't there be case that we provide the missing header data to ffdec_aac
> thru some means..... any inputs please.
>
> Rgds,
> Ashwini
>
> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> If you want to play it dynamically then you don't need to mux it again,
>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>
>>
>>
>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> Hi Sudarshan,
>>>
>>> Thanks for your input.
>>>
>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>> saving it into file.
>>>
>>> Like mux the incoming AAC data buffer and then decode it at the same
>>> time?
>>>
>>> rgds,
>>> -Ashwini
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>>
>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>> thats why you get that error message.
>>>>
>>>> To get the correct playable file, you again need to mux this raw aac
>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>> you need to have qtdemux in your pipeline if you don't use
>>>> decodebin2/playbin2.
>>>>
>>>> I hope this will help you.
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <[hidden email]
>>>> > wrote:
>>>>
>>>>> Hi All,
>>>>>
>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>> an error "FFMpeg can not decode AAC data"
>>>>>
>>>>> The details are as follows:
>>>>>
>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>
>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>
>>>>>
>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>> Someone please provide your inputs in getting it to play.
>>>>>
>>>>> Any help is greatly appreciated.
>>>>>
>>>>> -Ashwini
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 2
Date: Thu, 21 Jul 2011 09:09:18 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVbocRsfvXpG+ZO2sBODaLoouU3a=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Or you can do same in your application also, then no need to write a
plugin.

On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht
<[hidden email]>wrote:

> Yes you can insert missing header to raw aac data by writing your own
> plugin, and place it before decoder plugin. But you need to have certain
> information for header e.g. sampling frequency, channels, profile etc , and
> all this you suppose to get from demuxer.
>
>
>
>
> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>
>> HI Sudarshan,
>>
>> Adding aacparse didn't help. I get the parse error from aacparse.
>>
>> In my case, the file is read and demuxed by an application, which then
>> gives the audio stream data to my pipeline (which consists of aapsrc !
>> decoder ! alsasink ) for decoding and rendering.
>>
>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>> your inputs, but to no results.
>>
>> Can't there be case that we provide the missing header data to ffdec_aac
>> thru some means..... any inputs please.
>>
>> Rgds,
>> Ashwini
>>
>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>> [hidden email]> wrote:
>>
>>> If you want to play it dynamically then you don't need to mux it again,
>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>
>>>> Hi Sudarshan,
>>>>
>>>> Thanks for your input.
>>>>
>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>> saving it into file.
>>>>
>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>> time?
>>>>
>>>> rgds,
>>>> -Ashwini
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>> [hidden email]> wrote:
>>>>
>>>>>
>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>> thats why you get that error message.
>>>>>
>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>> decodebin2/playbin2.
>>>>>
>>>>> I hope this will help you.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>>> an error "FFMpeg can not decode AAC data"
>>>>>>
>>>>>> The details are as follows:
>>>>>>
>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>
>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>>
>>>>>>
>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>
>>>>>> Any help is greatly appreciated.
>>>>>>
>>>>>> -Ashwini
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>>
>>>>> Sudarshan Bisht
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Sudarshan Bisht
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 3
Date: Thu, 21 Jul 2011 11:44:37 +0530
From: Ashwini Sharma <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Hi,

Can you please tell me how to contruct the header from the given data, i.e.
sampling frequency, channels, profile etc

Thanks,
Ashwini

On Thu, Jul 21, 2011 at 11:39 AM, Sudarshan Bisht <[hidden email]
> wrote:

> Or you can do same in your application also, then no need to write a
> plugin.
>
>
>
> On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> Yes you can insert missing header to raw aac data by writing your own
>> plugin, and place it before decoder plugin. But you need to have certain
>> information for header e.g. sampling frequency, channels, profile etc , and
>> all this you suppose to get from demuxer.
>>
>>
>>
>>
>> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> HI Sudarshan,
>>>
>>> Adding aacparse didn't help. I get the parse error from aacparse.
>>>
>>> In my case, the file is read and demuxed by an application, which then
>>> gives the audio stream data to my pipeline (which consists of aapsrc !
>>> decoder ! alsasink ) for decoding and rendering.
>>>
>>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>>> your inputs, but to no results.
>>>
>>> Can't there be case that we provide the missing header data to ffdec_aac
>>> thru some means..... any inputs please.
>>>
>>> Rgds,
>>> Ashwini
>>>
>>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>> If you want to play it dynamically then you don't need to mux it again,
>>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>>
>>>>> Hi Sudarshan,
>>>>>
>>>>> Thanks for your input.
>>>>>
>>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>>> saving it into file.
>>>>>
>>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>>> time?
>>>>>
>>>>> rgds,
>>>>> -Ashwini
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>>
>>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>>> thats why you get that error message.
>>>>>>
>>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>>> decodebin2/playbin2.
>>>>>>
>>>>>> I hope this will help you.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>>> [hidden email]> wrote:
>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i
>>>>>>> get an error "FFMpeg can not decode AAC data"
>>>>>>>
>>>>>>> The details are as follows:
>>>>>>>
>>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>>
>>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works
>>>>>>> fine.
>>>>>>>
>>>>>>>
>>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>>
>>>>>>> Any help is greatly appreciated.
>>>>>>>
>>>>>>> -Ashwini
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> gstreamer-devel mailing list
>>>>>>> [hidden email]
>>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Regards,
>>>>>>
>>>>>> Sudarshan Bisht
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
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------------------------------

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

End of gstreamer-devel Digest, Vol 6, Issue 50
**********************************************

--
- bala

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

--
Regards,

Sudarshan Bisht

_______________________________________________
gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

ak.ashwini

Re: AAC not played - No Sound output

Hi Guys,

Thank you all for your valuable inputs. This is working fine now.

Rgds,

Ashwini

On Mon, Jul 25, 2011 at 7:11 PM, Sudarshan Bisht <[hidden email]> wrote:

Did you try dumping PCM samples to a file using filesink and playing through some tool ? If that plays that means at least the data what you are getting out of decoder plugin is correct.
It may be possible that you need audioconvert/audioresample before alsasink.

On Mon, Jul 25, 2011 at 3:51 PM, Ashwini Sharma <[hidden email]> wrote:
Hi All,

I am adding the ADTS header infront of the raw AAC frame and decoding it.

Now I see that the frames are being written to Alsasink, but there is no sound output actually.

The "snd_pcm_writei" function in "gst_alsasink_write" returns same number as input. Can someone point me in the right direction to get the Audio output.

Regards,
Ashwini

On Fri, Jul 22, 2011 at 11:07 AM, Balakrishnan Natarajan <[hidden email]> wrote:

The Elementary AAC can be playable only if it contains ADTS header.

So verify if your demuxer gives you the Elementary AAC stream with ADTS header.

You can verify this by playing with tools like foobar or winamp.

Once you have verified this may be you need to aacparse plugin to extract the ADTS header and pass it to the ffdec_aac plugin
through the codec-data caps field while negotiation.

Regards
Bala

On Thu, Jul 21, 2011 at 11:44 AM, <[hidden email]> wrote:

Send gstreamer-devel mailing list submissions to

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To subscribe or unsubscribe via the World Wide Web, visit

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When replying, please edit your Subject line so it is more specific
than "Re: Contents of gstreamer-devel digest..."

Today's Topics:

1. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
2. Re: AAC not played - Error from decoder (ffdec_aac)
(Sudarshan Bisht)
3. Re: AAC not played - Error from decoder (ffdec_aac)
(Ashwini Sharma)

----------------------------------------------------------------------

Message: 1
Date: Thu, 21 Jul 2011 08:23:47 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVYk7woyv+sO3DQcu3W86EkysYwoY60HhX=Rm6TA=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Yes you can insert missing header to raw aac data by writing your own
plugin, and place it before decoder plugin. But you need to have certain
information for header e.g. sampling frequency, channels, profile etc , and
all this you suppose to get from demuxer.

On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:

> HI Sudarshan,
>
> Adding aacparse didn't help. I get the parse error from aacparse.
>
> In my case, the file is read and demuxed by an application, which then
> gives the audio stream data to my pipeline (which consists of aapsrc !
> decoder ! alsasink ) for decoding and rendering.
>
> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
> your inputs, but to no results.
>
> Can't there be case that we provide the missing header data to ffdec_aac
> thru some means..... any inputs please.
>
> Rgds,
> Ashwini
>
> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> If you want to play it dynamically then you don't need to mux it again,
>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>
>>
>>
>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> Hi Sudarshan,
>>>
>>> Thanks for your input.
>>>
>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>> saving it into file.
>>>
>>> Like mux the incoming AAC data buffer and then decode it at the same
>>> time?
>>>
>>> rgds,
>>> -Ashwini
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>>
>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>> thats why you get that error message.
>>>>
>>>> To get the correct playable file, you again need to mux this raw aac
>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>> you need to have qtdemux in your pipeline if you don't use
>>>> decodebin2/playbin2.
>>>>
>>>> I hope this will help you.
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <[hidden email]
>>>> > wrote:
>>>>
>>>>> Hi All,
>>>>>
>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>> an error "FFMpeg can not decode AAC data"
>>>>>
>>>>> The details are as follows:
>>>>>
>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>
>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>
>>>>>
>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>> Someone please provide your inputs in getting it to play.
>>>>>
>>>>> Any help is greatly appreciated.
>>>>>
>>>>> -Ashwini
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 2
Date: Thu, 21 Jul 2011 09:09:18 +0300
From: Sudarshan Bisht <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<CACdEgVbocRsfvXpG+ZO2sBODaLoouU3a=[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Or you can do same in your application also, then no need to write a
plugin.

On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht
<[hidden email]>wrote:

> Yes you can insert missing header to raw aac data by writing your own
> plugin, and place it before decoder plugin. But you need to have certain
> information for header e.g. sampling frequency, channels, profile etc , and
> all this you suppose to get from demuxer.
>
>
>
>
> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>
>> HI Sudarshan,
>>
>> Adding aacparse didn't help. I get the parse error from aacparse.
>>
>> In my case, the file is read and demuxed by an application, which then
>> gives the audio stream data to my pipeline (which consists of aapsrc !
>> decoder ! alsasink ) for decoding and rendering.
>>
>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>> your inputs, but to no results.
>>
>> Can't there be case that we provide the missing header data to ffdec_aac
>> thru some means..... any inputs please.
>>
>> Rgds,
>> Ashwini
>>
>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>> [hidden email]> wrote:
>>
>>> If you want to play it dynamically then you don't need to mux it again,
>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>
>>>
>>>
>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>
>>>> Hi Sudarshan,
>>>>
>>>> Thanks for your input.
>>>>
>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>> saving it into file.
>>>>
>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>> time?
>>>>
>>>> rgds,
>>>> -Ashwini
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>> [hidden email]> wrote:
>>>>
>>>>>
>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>> thats why you get that error message.
>>>>>
>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>> decodebin2/playbin2.
>>>>>
>>>>> I hope this will help you.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i get
>>>>>> an error "FFMpeg can not decode AAC data"
>>>>>>
>>>>>> The details are as follows:
>>>>>>
>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>
>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works fine.
>>>>>>
>>>>>>
>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>
>>>>>> Any help is greatly appreciated.
>>>>>>
>>>>>> -Ashwini
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>>
>>>>> Sudarshan Bisht
>>>>>
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> [hidden email]
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Sudarshan Bisht
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> [hidden email]
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>

--
Regards,

Sudarshan Bisht
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------------------------------

Message: 3
Date: Thu, 21 Jul 2011 11:44:37 +0530
From: Ashwini Sharma <[hidden email]>
Subject: Re: AAC not played - Error from decoder (ffdec_aac)
To: Discussion of the development of and with GStreamer

<[hidden email]>
Message-ID:
<[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Hi,

Can you please tell me how to contruct the header from the given data, i.e.
sampling frequency, channels, profile etc

Thanks,
Ashwini

On Thu, Jul 21, 2011 at 11:39 AM, Sudarshan Bisht <[hidden email]
> wrote:

> Or you can do same in your application also, then no need to write a
> plugin.
>
>
>
> On Thu, Jul 21, 2011 at 8:23 AM, Sudarshan Bisht <
> [hidden email]> wrote:
>
>> Yes you can insert missing header to raw aac data by writing your own
>> plugin, and place it before decoder plugin. But you need to have certain
>> information for header e.g. sampling frequency, channels, profile etc , and
>> all this you suppose to get from demuxer.
>>
>>
>>
>>
>> On Thu, Jul 21, 2011 at 7:43 AM, Ashwini Sharma <[hidden email]>wrote:
>>
>>> HI Sudarshan,
>>>
>>> Adding aacparse didn't help. I get the parse error from aacparse.
>>>
>>> In my case, the file is read and demuxed by an application, which then
>>> gives the audio stream data to my pipeline (which consists of aapsrc !
>>> decoder ! alsasink ) for decoding and rendering.
>>>
>>> I am able to play ac3 and mp3. But AAC i am having failure still. I tried
>>> your inputs, but to no results.
>>>
>>> Can't there be case that we provide the missing header data to ffdec_aac
>>> thru some means..... any inputs please.
>>>
>>> Rgds,
>>> Ashwini
>>>
>>> On Wed, Jul 20, 2011 at 8:19 PM, Sudarshan Bisht <
>>> [hidden email]> wrote:
>>>
>>>> If you want to play it dynamically then you don't need to mux it again,
>>>> maybe you can use aacparse between demuxer and aac decoder plugin.
>>>>
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 4:06 PM, Ashwini Sharma <[hidden email]>wrote:
>>>>
>>>>> Hi Sudarshan,
>>>>>
>>>>> Thanks for your input.
>>>>>
>>>>> Can I play the AAC data dynamically, as suggested by you, instead of
>>>>> saving it into file.
>>>>>
>>>>> Like mux the incoming AAC data buffer and then decode it at the same
>>>>> time?
>>>>>
>>>>> rgds,
>>>>> -Ashwini
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 20, 2011 at 5:59 PM, Sudarshan Bisht <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>>
>>>>>> Demuxer outputs raw aac data, it does not have any header(ADIF/ADTS)
>>>>>> thats why you get that error message.
>>>>>>
>>>>>> To get the correct playable file, you again need to mux this raw aac
>>>>>> data using qtmux and then you get .m4a file. And to play this .m4a file
>>>>>> you need to have qtdemux in your pipeline if you don't use
>>>>>> decodebin2/playbin2.
>>>>>>
>>>>>> I hope this will help you.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Jul 20, 2011 at 1:52 PM, Ashwini Sharma <
>>>>>> [hidden email]> wrote:
>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> I have a demuxed audio stream (AAC encoded). When I try to play, i
>>>>>>> get an error "FFMpeg can not decode AAC data"
>>>>>>>
>>>>>>> The details are as follows:
>>>>>>>
>>>>>>> I have a video file which contain mpeg4 video and AAC audio. I Demux
>>>>>>> the file into Audio and video files. When i play the demuxed audio it fails.
>>>>>>>
>>>>>>> But when i reapeat the same test for AC3 or MP3 audios, it works
>>>>>>> fine.
>>>>>>>
>>>>>>>
>>>>>>> I think there is some mistake on my part when playing the AAC file.
>>>>>>> Someone please provide your inputs in getting it to play.
>>>>>>>
>>>>>>> Any help is greatly appreciated.
>>>>>>>
>>>>>>> -Ashwini
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> gstreamer-devel mailing list
>>>>>>> [hidden email]
>>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Regards,
>>>>>>
>>>>>> Sudarshan Bisht
>>>>>>
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> [hidden email]
>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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>>>>
>>>>
>>>> --
>>>> Regards,
>>>>
>>>> Sudarshan Bisht
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> [hidden email]
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>> _______________________________________________
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>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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--
- bala

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