* Mark Burton on Friday, April 14, 2017 at 21:45:07 +0100 >> * Mark Burton on Friday, April 14, 2017 at 16:57:06 +0100 >>> Here is the basic command to reproduce. I have attached the uncut loglevel >>> 99 console output for this command: >>> ffmpeg -i SyncTest24p.mov -c:v libx264 -pix_fmt yuv420p -movflags faststart >>> -c:a aac -b:a 128k ffmpeg.mp4 >> >> Can you try: >> >> -filter:a aresample=first_pts=0 > > Thanks for your reply and these options to test. This first one does not > appear to change the outcome. ffprobe for ffmpeg_v2 attached. > >> Also, when you run with -v verbose, you'll see a delay (depends >> on audio codec), for you case it's probably 1024. Maybe try: >> >> -filter:a aresample=first_pts=0,asetpts=PTS-STARTPTS+1024 >> >> Especially the latter could be exactly the wrong thing for your >> purpose, but it doesn't hurt trying. > > 1024 looks correct. This method successfully changes the start, and the > encoded audio plays, almost, 100% in sync. Its slightly cut off at the head, > but only very slightly. However the downside of this method is that the audio > now overruns the end of the picture further and is not trimmed from remaining > samples I’m guessing. This results in a blank video frame being added to the > tail of clip. ffprobe for ffmpeg_v3 attached > . > > I tried using -shortest, but that didn’t help address the above issue.
Inserting -t `ffprobe -v quiet -of default=nw=1:nk=1 -select_streams V -show_entries stream=duration SyncTest24p.mov` into your commandline should do the trick. imho this is a muxing bug in dealing with aac priming in many situations, but making my case fell on deaf ears. -- \black\trash movie _SAME TIME SAME PLACE_ --->> https://blacktrash.org/underdogma/stsp.php \black\trash audio _ANOTHER TIME ANOTHER PLACE_ --->> https://blacktrash.org/underdogma/atap.html _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
