[Libav-user] Synchronising an audio and video streams when muxing
monakov.y at gmail.com
Sat Dec 11 20:11:57 EET 2021
You can derive your video pts from audio pts by rescaling and call
av_interleaved_write_frame. Mixer will do the rest.
пт, 10 дек. 2021 г. в 12:23, Nuno Santos <nuno.santos at imaginando.pt>:
> I’m generating a visual feed that is reacting to audio. Both audio and
> video are being generated in real time, each in its own thread.
> While the audio generation is always steady, video generation is not
> precise and can have fluctuations.
> While the muxing example provides a good start on how to use ffmpeg for
> audio and video muxing, it doesn’t cover synchronisation aspects since the
> video and the audio are generated in the same loop, on demand, without any
> possible fluctuation.
> I’m trying to achieve perfect synchronisation between audio and video but
> I feel I’m navigating uncharted terrains here.
> Some problems that I have identified but don’t have a proper solution at
> the moment:
> - the audio buffer can start having samples sooner than the video buffer
> of vice-versa. Ideally the first frame of video should match the first
> frame of audio.
> - I’m already rescaling the video pts and dts to adjust the video
> generation fluctuations but audio is always a fixed value and cannot
> Are there examples that show how to achieve this? What are the best
> Thank you!
> Best regards,
> Libav-user mailing list
> Libav-user at ffmpeg.org
> To unsubscribe, visit link above, or email
> libav-user-request at ffmpeg.org with subject "unsubscribe".
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Libav-user