[gst-devel] Slight audio/video sync problem - any suggestions?

[Mark Nauwelaerts]

This could be another example of what is mentioned in the Note at the end of
section
http://gentrans.sourceforge.net/docs/head/manual/html/howto.html#sect-recording
(observe that introducing a queue actually entails a "separate thread", as it is
mentioned in this context).

In itself, that may not provide more of an explanation :-(,
but may give some ideas/inspiration to variations/alternatives.

Regards,
Mark.

Jason L. Buberel wrote:
> Oddly enough, that makes things worse :(
> 
> Here is what I have confirmed - the following command will result in a
> VERY clear high quality audio-only recording on my configuration:
> 
>> gst-launch-0.10 alsasrc device="hw:1,0" !
> audio/x-raw-int,rate=16000,channels=1,depth=16 ! audioconvert !
> vorbisenc ! oggmux ! filesink location=audio-only.ogg
> 
> Which you can hear:
> 
> http://www.buberel.org/audio-only.ogg
> 
> But when I use Nei's command below, which has essentially the same audio
> parameters but with the additional 'queue' element to record audio and
> video, I see many of the following error messages:
> 
> WARNING: from element /pipeline0/alsasrc0: Can't record audio fast enough
> Additional debug info:
> gstbaseaudiosrc.c(603): gst_base_audio_src_create (): /pipeline0/alsasrc0:
> dropped 13600 samples
> WARNING: from element /pipeline0/alsasrc0: Can't record audio fast enough
> Additional debug info:
> gstbaseaudiosrc.c(603): gst_base_audio_src_create (): /pipeline0/alsasrc0:
> dropped 12000 samples
> WARNING: from element /pipeline0/alsasrc0: Can't record audio fast enough
> Additional debug info:
> 
> I am going to work on an ascii-art diagram of this pipeline in the hopes
> that it will help others see the mistake I am making.
> 
> -jason
> 
> 
> Nie Jun wrote:
>> gst-launch-0.10 v4l2src ! queue ! videorate !
>> video/x-raw-yuv,width=800,height=600,framerate=15/1  !
>> ffmpegcolorspace ! theoraenc ! queue ! oggmux name=mux alsasrc
>> device="hw:1,0"  ! audiorate !
>> audio/x-raw-int,rate=16000,channels=1,depth=16 ! queue ! audioconvert
>> ! vorbisenc ! QUEUE ! mux. mux. ! queue ! filesink sync=true
>> location=test.ogg
>>
>> hope it helps you.
>>   
> 
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