[FFmpeg-user] A/V synchronization question

[Anatol]

Try "-async 1" on input (place it BEFORE th "-i")


On Thu, Aug 21, 2014 at 5:05 PM, Elżbieta Jakubska <
elzbieta.jakubska at gmail.com> wrote:

> Hi,
>
> I have a small problem with A/V synchronization when saving live tv_stream
> to avi. I would need to have very good synchronization, or in the worst
> case - video before audio, but I have video a little bit after audio (video
> goes about half of the video frame after audio, what makes that I can see
> previous video frame wile the audio for next one is playing). I use the
> following command for dumping the stream to file:
>
>  ffmpeg -y -probesize 6000000 -threads 1 -i http://url -vf scale=640:360
> -b:v 800k -acodec libmp3lame -b:a 128k -ac 1 -af aresample=async=1000 -ss 0
> -threads 1 -t 120 -f avi test.avi
>
>
> Please, could you help me to synchronize this? Is it maybe a way to push
> video one frame forward? Or maybe using -vsync option would be useful? I
> was already trying also with vsync option, but I haven't got good results.
>
> Thank you for your answers,
>
> Ela
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