Multistream support in gst-launch

[Neil Jones]

Hi,

Could someone explain how to describe multi path streams in gst-launch syntax,
I want to test a multi-stream (hardware) audio decoder with an inbuilt mixer,
the gst  component has 2 input pads and 3 outputs pads.

There are 2 scenarios I want to test:

1) connect 2 filesrc’s to the input pads (0 & 1) and alsasink to the
mixed output pad (pad1)

2) connect 2 filesrc’s to the input pad (0 & 1), alsa sink to the
mixed output pad (pad 1) and 2 filesinks to the other 2 pads (0 and
1).

The component looks like:

 ____       ________                 _____
|SRC0|_____|Decoder0|_______________|SINK0|
|____|     |________|  |            |_____|
                       |   _____     _____
                       ---|MIXER|___|SINK1|
                       ---|_____|   |_____|
 ____       ________   |             _____
|SRC1|_____|Decoder1|__|____________|SINK2|
|____|     |________|               |_____|


Cheers for the help,

Neil
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[Luis de Bethencourt]

so something like:

gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink  filesrc !
decoder ! mix.

notice the lack of "!" between sink and second filesrc, equivalent to:

gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink \
filesrc ! decoder ! mix.

Luis

On 17 May 2012 10:18, Neil Jones <[hidden email]> wrote:

> Hi,
>
> Could someone explain how to describe multi path streams in gst-launch syntax,
> I want to test a multi-stream (hardware) audio decoder with an inbuilt mixer,
> the gst  component has 2 input pads and 3 outputs pads.
>
> There are 2 scenarios I want to test:
>
> 1) connect 2 filesrc’s to the input pads (0 & 1) and alsasink to the
> mixed output pad (pad1)
>
> 2) connect 2 filesrc’s to the input pad (0 & 1), alsa sink to the
> mixed output pad (pad 1) and 2 filesinks to the other 2 pads (0 and
> 1).
>
> The component looks like:
>
>  ____       ________                 _____
> |SRC0|_____|Decoder0|_______________|SINK0|
> |____|     |________|  |            |_____|
>                       |   _____     _____
>                       ---|MIXER|___|SINK1|
>                       ---|_____|   |_____|
>  ____       ________   |             _____
> |SRC1|_____|Decoder1|__|____________|SINK2|
> |____|     |________|               |_____|
>
>
> Cheers for the help,
>
> Neil
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Neil Jones]

Cheers,

I have given this a try, my decoder and mixer are a single component
so my pipeline looks like:

gst-launch-0.10 filesrc  ! decoder_and_mix ! sink  filesrc ! decoder_and_mix

the syntax seems to work, but I get 2 seperate calls to the init and
change_state functions as If gstreame rhas created 2 seprate
decode_and_mix components, I would have only expected 1 call to both
of these functions ?

Cheers

Neil


On Fri, May 18, 2012 at 12:58 PM, Luis de Bethencourt
<[hidden email]> wrote:

> so something like:
>
> gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink  filesrc !
> decoder ! mix.
>
> notice the lack of "!" between sink and second filesrc, equivalent to:
>
> gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink \
> filesrc ! decoder ! mix.
>
> Luis
>
> On 17 May 2012 10:18, Neil Jones <[hidden email]> wrote:
>> Hi,
>>
>> Could someone explain how to describe multi path streams in gst-launch syntax,
>> I want to test a multi-stream (hardware) audio decoder with an inbuilt mixer,
>> the gst  component has 2 input pads and 3 outputs pads.
>>
>> There are 2 scenarios I want to test:
>>
>> 1) connect 2 filesrc’s to the input pads (0 & 1) and alsasink to the
>> mixed output pad (pad1)
>>
>> 2) connect 2 filesrc’s to the input pad (0 & 1), alsa sink to the
>> mixed output pad (pad 1) and 2 filesinks to the other 2 pads (0 and
>> 1).
>>
>> The component looks like:
>>
>>  ____       ________                 _____
>> |SRC0|_____|Decoder0|_______________|SINK0|
>> |____|     |________|  |            |_____|
>>                       |   _____     _____
>>                       ---|MIXER|___|SINK1|
>>                       ---|_____|   |_____|
>>  ____       ________   |             _____
>> |SRC1|_____|Decoder1|__|____________|SINK2|
>> |____|     |________|               |_____|
>>
>>
>> Cheers for the help,
>>
>> Neil
>> _______________________________________________
>> 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

_______________________________________________
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[Neil Jones]

Ah I see what im doing wrong I need to name my element and use that
name for the 2nd stream eg:

gst-launch-0.10 filesrc  ! decoder_and_mix name=mix ! sink  filesrc ! mix.

Neil


On Wed, May 23, 2012 at 10:42 AM, Neil Jones <[hidden email]> wrote:

> Cheers,
>
> I have given this a try, my decoder and mixer are a single component
> so my pipeline looks like:
>
> gst-launch-0.10 filesrc  ! decoder_and_mix ! sink  filesrc ! decoder_and_mix
>
> the syntax seems to work, but I get 2 seperate calls to the init and
> change_state functions as If gstreame rhas created 2 seprate
> decode_and_mix components, I would have only expected 1 call to both
> of these functions ?
>
> Cheers
>
> Neil
>
>
> On Fri, May 18, 2012 at 12:58 PM, Luis de Bethencourt
> <[hidden email]> wrote:
>> so something like:
>>
>> gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink  filesrc !
>> decoder ! mix.
>>
>> notice the lack of "!" between sink and second filesrc, equivalent to:
>>
>> gst-launch-0.10 filesrc  ! decoder ! mixer name=mix ! sink \
>> filesrc ! decoder ! mix.
>>
>> Luis
>>
>> On 17 May 2012 10:18, Neil Jones <[hidden email]> wrote:
>>> Hi,
>>>
>>> Could someone explain how to describe multi path streams in gst-launch syntax,
>>> I want to test a multi-stream (hardware) audio decoder with an inbuilt mixer,
>>> the gst  component has 2 input pads and 3 outputs pads.
>>>
>>> There are 2 scenarios I want to test:
>>>
>>> 1) connect 2 filesrc’s to the input pads (0 & 1) and alsasink to the
>>> mixed output pad (pad1)
>>>
>>> 2) connect 2 filesrc’s to the input pad (0 & 1), alsa sink to the
>>> mixed output pad (pad 1) and 2 filesinks to the other 2 pads (0 and
>>> 1).
>>>
>>> The component looks like:
>>>
>>>  ____       ________                 _____
>>> |SRC0|_____|Decoder0|_______________|SINK0|
>>> |____|     |________|  |            |_____|
>>>                       |   _____     _____
>>>                       ---|MIXER|___|SINK1|
>>>                       ---|_____|   |_____|
>>>  ____       ________   |             _____
>>> |SRC1|_____|Decoder1|__|____________|SINK2|
>>> |____|     |________|               |_____|
>>>
>>>
>>> Cheers for the help,
>>>
>>> Neil
>>> _______________________________________________
>>> 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

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