Gstreamer synch/drop problems.

[Stefan Sauer]

On 09/15/11 11:22, Jaka Hudoklin wrote:
> Hello!
>
> I have the following script to start stream and record to avi file.
> gst-launch-0.10 \
>         v4l2src device=/dev/video0 ! queue ! ffmpegcolorspace ! tee
> name=raw_camera \
>         v4l2src device=/dev/video1 ! queue ! ffmpegcolorspace ! tee
> name=raw_camera2 \
>         raw_camera. ! videorate ! \
>                 video/x-raw-yuv,framerate=20/1 ! tee name=t_video1 \
>         raw_camera2. ! videoscale !
> video/x-raw-yuv,width=133,height=100 ! videorate ! \
>                 video/x-raw-yuv,framerate=20/1 ! tee name=t_video2 \
>         multifilesrc location="logo.png"
> caps="image/png,framerate=1/1" ! pngdec ! freeze ! alpha method=0
> alpha=1 ! ffmpegcolorspace$
>         videomixer name=pip sink_0::xpos=0 sink_0::ypos=0
> sink_0::zorder=0 sink_1::xpos=449 sink_1::ypos=334 sink_1::alpha=0.8
> sink_1$
>         alsasrc device=hw:0,0 ! queue !
> audio/x-raw-int,rate=44100,depth=16,channels=2,signed$
>         t_video1. ! queue ! pip.sink_0 \
>         t_video2. ! queue ! pip.sink_1 \
>         t_logo. ! queue ! pip.sink_2 \
>         t_video. ! queue ! vp8enc ! queue ! avimux name=mux ! filesink
> location=test.avi sync=false \
>         t_audio. ! audioconvert ! alawenc ! .mux
>
> The problem is with mux component, which doesn't want to mix audio and
> video together and just drops frames. If i change last two lines to:
>         t_video. ! queue ! vp8enc ! queue ! filesink location=test.vid
> sync=false \
>         t_audio. ! audioconvert ! alawenc ! filesink location=test.snd
> sync=false
> everything works fine, except that i don't get muxed audio and video.
> I can see in log that videframes have timestamps starting from 0, but
> audio has timestamps, from some higher numbers. Could this be the
> problem? Does anybody have any idea what could be the problem and why
> avimux doesn't mix streams? It's clearly problem with gstreamere and
> not hardware, because in case no. 2 cpu is not nearly fully loaded.

This could be a bug in avimux (file a bug). Try also some more modern
format e.g. mp4mux.

Stefan
>
> Have a nice day, Jaka Hudoklin.
>
>
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