> I am having a problem with the video / audio sync when recording from an > RTSP stream with ffmpeg.
> The result seems leave the video and audio out of sync in Windows Media > Player (which unfortunately is the application I need to use for this), where > as VLC seems to be able to cope with this and rectifies the problem. Andy, I have a similar (if not exact same) problem when copying an RTSP stream. I've also verified the different behavior in Windows Media Player and VLC. The workaround I found was to run the resultant video through an ffmpeg process using -ss 0 -i input -c copy which seems to bring the audio and video back into sync. It's a quick "copy" process. No need to find the exact offset as -ss 0 seemed to work no matter what amount of offset there was. My theory is that ffmpeg waits until a keyframe before copying video, but audio starts copying right away which causes audio to lag video (video is pulled forward to fill the non-keyframe gap). The -copyinkf (copy initial non-keyframe) parameter didn't have any affect for me. Again, only a theory. I'm just a user, not a developer. Dave _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
