> On 14 Apr 2017, at 22:22, Christian Ebert <blacktr...@gmx.net> wrote: >>> 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.
Adding '-t 2.000000’ to the command does help a little, but ultimately the final audio packet is still too large - 6ms in this case - and the black frame still occurs. [PACKET] codec_type=audio stream_index=1 pts=95232 pts_time=1.984000 dts=95232 dts_time=1.984000 duration=1056 duration_time=0.022000 convergence_duration=N/A convergence_duration_time=N/A size=406 pos=23401 flags=K_ [/PACKET] > imho this is a muxing bug in dealing with aac priming in many > situations, but making my case fell on deaf ears. It feels a bit odd having to chase the output file in this way doesn’t it. I’ve read a number of the reports around this issue (perhaps some from you?) and there does appear to be a real difference of opinion on both sides. How do you work round this in your products? I find it hard having to accept an encode will always play out of sync on certain players. Thank so much for your help, Regards Mark _______________________________________________ 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".
