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about capturing 5.1 and 7.1 sources

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Julien Isorce

about capturing 5.1 and 7.1 sources

hi,

There is a ac3iec958 element that can convert a ac" stream to raw int stereo data (audio/x-raw-int, channels=2). Am I correct ?

Well, Is there a rawIntStereo_to_ac3 element ? does it make sense ? (Because I heard tha ac3 can be provided over raw stereo.)

Does anyone can share its experience about capturing 5.1 or 7.1 sources ? (from blueray or any kind of sources)

Maybe there is somewhere a copyright limitation, I mean something like HDCP ....

Sincerely

Julien

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Wim Taymans

Re: about capturing 5.1 and 7.1 sources

On Tue, 2009-09-08 at 17:53 +0200, Julien Isorce wrote:
> hi,
>
> There is a ac3iec958 element that can convert a ac" stream to raw int
> stereo data (audio/x-raw-int, channels=2). Am I correct ?

No, ac3iec958 pads AC3 frames into IEC958 frames suitable for a raw
S/PDIF interface. It does not convert anything to raw audio.

>
> Well, Is there a rawIntStereo_to_ac3 element ? does it make sense ?
> (Because I heard tha ac3 can be provided over raw stereo.)

audio/x-raw-int to ac3 would be ffenc_ac3..

Wim

>
> Does anyone can share its experience about capturing 5.1 or 7.1
> sources ? (from blueray or any kind of sources)
>
> Maybe there is somewhere a copyright limitation, I mean something like
> HDCP ....
>
> Sincerely
>
> Julien
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
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Julien Isorce

Re: about capturing 5.1 and 7.1 sources

2009/9/8 Wim Taymans <[hidden email]>

On Tue, 2009-09-08 at 17:53 +0200, Julien Isorce wrote:
> hi,
>
> There is a ac3iec958 element that can convert a ac" stream to raw int
> stereo data (audio/x-raw-int, channels=2). Am I correct ?

No, ac3iec958 pads AC3 frames into IEC958 frames suitable for a raw
S/PDIF interface. It does not convert anything to raw audio.

This is what I mean: ac3 over raw stereo. I did not talk about decoding like ffdec_ac3
Sorry i was not very precise:
'raw-audio' property on ac3iec958 element

>
> Well, Is there a rawIntStereo_to_ac3 element ? does it make sense ?
> (Because I heard tha ac3 can be provided over raw stereo.)

audio/x-raw-int to ac3 would be ffenc_ac3..

ok there is no iec958ac3 so.

Thx
Julien

Wim

>
> Does anyone can share its experience about capturing 5.1 or 7.1
> sources ? (from blueray or any kind of sources)
>
> Maybe there is somewhere a copyright limitation, I mean something like
> HDCP ....
>
> Sincerely
>
> Julien

> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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Tim-Philipp Müller-2

Re: about capturing 5.1 and 7.1 sources

In reply to this post by Julien Isorce

On Tue, 2009-09-08 at 17:53 +0200, Julien Isorce wrote:

> There is a ac3iec958 element that can convert a ac" stream to raw int
> stereo data (audio/x-raw-int, channels=2). Am I correct ?
>
> Well, Is there a rawIntStereo_to_ac3 element ? does it make sense ?
> (Because I heard that ac3 can be provided over raw stereo.)

Some people put AC3 or DTS data into 16-bit stereo PCM streams, but this
is mostly a "hack" as far as I know. This kind of mis-labelling of the
stream contents should not really be needed.

I don't think there's an iec958ac3 element yet. Alsasrc would probably
need a few fixes before this would work anyway.

Cheers
-Tim

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Julien Isorce

Re: about capturing 5.1 and 7.1 sources

2009/9/8 Tim-Philipp Müller <[hidden email]>

On Tue, 2009-09-08 at 17:53 +0200, Julien Isorce wrote:

> There is a ac3iec958 element that can convert a ac" stream to raw int
> stereo data (audio/x-raw-int, channels=2). Am I correct ?
>
> Well, Is there a rawIntStereo_to_ac3 element ? does it make sense ?

> (Because I heard that ac3 can be provided over raw stereo.)

Some people put AC3 or DTS data into 16-bit stereo PCM streams, but this
is mostly a "hack" as far as I know. This kind of mis-labelling of the
stream contents should not really be needed.

I don't think there's an iec958ac3 element yet.

Alsasrc would probably
need a few fixes before this would work anyway.

Why ? I think spdif input also supports 16 bits stereo raw int.

Well It seems that newer capture devices are responsible for decoding ac3 or dts, in hardware. And so directly provide pcm.

I am currently testing the sound blaster X-Fi extreme audio, but I can't capture and resitute 5.1 or 7.1.
(linux: driver pb, seems to be not correctly reconized by alsa)
win: maximun 2 channels)

If anyone already succedeed to capture 5.1 or 7.1 with a correct restitution, it would be appreciated to share the model of the capture card. (linux or other os)

Sincerely
Julien

Cheers
-Tim

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