[gst-devel] dshowvideosrc with a mux

[Julien Moutte]

Try adding a queue between the src elements and the video/audio encoders.

Julien

Andy Sturges wrote:
> Julien,
>
> thanks for replying to this question,  I'll give a bit more detail on
> the problem I am seeing.  The pipeline in the email is not my original
> pipe line - which as you suggested encodes the video and audio mux
> them together and then save them to a file:
>
> gst-launch-0.10.exe dshowvideosrc ! ffmpegcolorspace ! videorate !
> video/x-raw-yuv,framerate=15/1 ! ffmpegcolorspace ! theoraenc ! queue
> ! oggmux name=mux dshowaudiosrc ! audioconvert ! vorbisenc ! queue !
> mux. mux. ! queue ! filesink location=output.ogg
>
> But the encoded video was showing very slow video capture speed but
> good audio capture.  Capturing the video on its own to a file has no
> problems.  The example in my mail was just the simplest pipe I could
> produce which would illustrate the problem.
>
> My video and audio source is a Logitech USB web cam  and I am using
> the latest Windows binary downloads (which look like they may be based
> an older gstreamer release than current source release) so if there
> are some newer binaries available I would like to try them.
>
> thanks Andy
>
> On Mon, Apr 28, 2008 at 6:59 AM, Julien Moutte <julien at moutte.net> wrote:
>   
>> First you probably have a latency issue as this is a live pipeline and
>> avimux / avidemux could add some latency.
>>
>>  Second you should not try to play what you just muxed in the same pipeline.
>> You should compress the video and then store to a file that you can play
>> later on. If you want local feedback from the capture you should use tee
>> after the source and have a preview branch.
>>
>>  Julien
>>
>>
>>  On Apr 23, 2008, at 1:40, Andy Sturges <andy at sturges.me.uk> wrote:
>>
>>
>>     
>>> I am trying to capture video and audio and mux them into a single file
>>> on windows XP, but am seeing very slow video capture when using any form
>>> of mux.  To illustrate the problem here a a couple of simple examples:
>>>
>>> This pipeline works fine:
>>>
>>>   gst-launch-0.10.exe dshowvideosrc ! ffmpegcolorspace  ! directdrawsink
>>>
>>> but adding a mux/demux stage into the pipe causes the video to be very
>>> slow:
>>>
>>>  dshowvideosrc ! ffmpegcolorspace ! avimux ! avidemux !
>>> ffmpegcolorspace ! directdrawsink
>>>
>>> I have tried adding queues and videorate controls but this makes no
>>> difference.
>>>
>>> Any input on this problem welcome,
>>>
>>> Andy
>>>
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