Re: [FFmpeg-user] DASH and Variable framerate
On 07/08/2020 13:25, Moritz Barsnick wrote: On Thu, Aug 06, 2020 at 15:00:55 +0200, Alfred E. Heggestad wrote: I am wondering if DASH muxer supports variable framerate. [...] What I have seen is that DASH and HLS behaves differently regarding variable framerate input. muxer: format: audio delay: DASH:m4s yes DASH w HLS playlist: m4s yes HLS muxer: mpegtsno I suspect this is due to the fact that ffmpeg does not handle variable framerate in MOV/MP4 well (which m4s is a variant of, IIUC). Thanks for the answer. Yes m4s is fragmented MP4. This also seems to match my observations. /alfred in m4s the audio and video track is stored in separate .m4s files. after some time they become out of sync. I don't think the separate files are the issue. HLS can also separate video and audio into separate files, as far as I remember. Cheers, Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] DASH and Variable framerate
On Thu, Aug 06, 2020 at 15:00:55 +0200, Alfred E. Heggestad wrote: > I am wondering if DASH muxer supports variable framerate. [...] > What I have seen is that DASH and HLS behaves differently > regarding variable framerate input. >muxer: format: audio delay: > >DASH:m4s yes >DASH w HLS playlist: m4s yes >HLS muxer: mpegtsno I suspect this is due to the fact that ffmpeg does not handle variable framerate in MOV/MP4 well (which m4s is a variant of, IIUC). > in m4s the audio and video track is stored in separate .m4s files. > after some time they become out of sync. I don't think the separate files are the issue. HLS can also separate video and audio into separate files, as far as I remember. Cheers, Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] DASH and Variable framerate
Hi, I am wondering if DASH muxer supports variable framerate. What I have seen is that DASH and HLS behaves differently regarding variable framerate input. muxer: format: audio delay: DASH:m4s yes DASH w HLS playlist: m4s yes HLS muxer: mpegtsno in m4s the audio and video track is stored in separate .m4s files. after some time they become out of sync. in mpegts the audio/video track is stored in the same .ts file. no issues with a/v sync here The ffmpeg command is used with RTMP as input: $ ffmpeg -listen 1 -i rtmp://127.0.0.1:1935/foo \ -c:v copy \ -c:a copy \ \ -f dash -remove_at_exit false playlist.mpd any feedback is appreciated. /alfred ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
