#2325: MP4 AAC Audio is delayed by 2ms when converted to PCM -------------------------------------+------------------------------------- Reporter: BChap | Owner: (none) Type: defect | Status: open Priority: important | Component: | undetermined Version: git-master | Resolution: Keywords: aac mov | Blocked By: regression | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by Balling):

mdhd.duration is also different after -c copy. Oogh.

It is actually the same, while post-editlist durations (mvhd and tkhd) become wrong, 238915 vs 238800. Anyway after #9671 '''looks like''' decoding to wav is more correct, i.e. it does not cut off too much good sound in the begenning. By looks like I mean I compared to Don't Shut Me Down.'''flac''' that has 3m 58s 800ms (to get 800 ms info I used Medianfo in "advanced mode"), while after #9671 you get when decoding HE-AAC to WAV 3m 58s 819ms but original aac file in Mediainfo says -19 ms should be done (Duration_LastFrame: -19 ms) due to editlist duration. And that way both are the same. We really need to do https://bugs.chromium.org/p/chromium/issues/detail?id=668999 -- Ticket URL: <https://trac.ffmpeg.org/ticket/2325#comment:23> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker