#5448(undetermined:new): aac: wrong calculation of duration
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: new Priority: normal | Component: Version: | undetermined unspecified | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 -------------------------------------+------------------------------------- it used to be correct long time ago: {{{ C:\>ffmpeg -i 1.aac ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers built on Jan 21 2014 18:55:26 with gcc 4.8.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable- libfreetyp e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable- libvo-aa cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable- libwavp ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 52. 48.101 / 52. 48.101 libavcodec 55. 39.101 / 55. 39.101 libavformat 55. 19.104 / 55. 19.104 libavdevice 55. 5.100 / 55. 5.100 libavfilter 3. 90.100 / 3. 90.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 17.104 / 0. 17.104 libpostproc 52. 3.100 / 52. 3.100 [aac @ 02a7a980] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from '1.aac': Duration: 00:00:29.58, bitrate: 73 kb/s Stream #0:0: Audio: aac, 88200 Hz, mono, fltp, 73 kb/s At least one output file must be specified }}} {{{ C:\>ffmpeg -i 1.aac out.wav ffmpeg version N-79468-ga676c29 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.0-1.fc14) configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch= x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686 -pc-min gw32-gcc' --enable-pthreads --enable-memalign-hack --enable-runtime- cpudetect -- enable-cross-compile --enable-static --disable-shared --extra- libs='-lws2_32 -lw inmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapsh ots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/sna pshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable- version3 -- enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-li bvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-li bopencore-amrwb --enable-libmp3lame --enable-libfreetype --enable-libvpx --disab le-decoder=libvpx libavutil 55. 22.100 / 55. 22.100 libavcodec 57. 34.102 / 57. 34.102 libavformat 57. 34.101 / 57. 34.101 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 42.100 / 6. 42.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 [aac @ 0x2894160] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from '1.aac': Duration: 00:04:47.72, bitrate: 7 kb/s Stream #0:0: Audio: aac (LC), 88200 Hz, mono, fltp, 7 kb/s File 'out.wav' already exists. Overwrite ? [y/N] y [wav @ 0x2897420] Using AVStream.codec to pass codec parameters to muxers is dep recated, use AVStream.codecpar instead. Output #0, wav, to 'out.wav': Metadata: ISFT : Lavf57.34.101 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 88200 Hz, mono, s16, 1411 kb/s Metadata: encoder : Lavc57.34.102 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 0; changing to 88057. This may result in incorrect timestamps in the output file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 1024; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 2048; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 3072; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 4096; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 5120; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 6144; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 7168; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 8192; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 9216; changing to 88057. This may result in incorrect timestamps in the out put file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 10240; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 11264; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 12288; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 13312; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 14336; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 15360; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 16384; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 17408; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 18432; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 19456; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 20480; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 21504; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 22528; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 23552; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 24576; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 25600; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 26624; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 27648; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 28672; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 29696; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 30720; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 31744; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 32768; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 33792; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 34816; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 35840; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 36864; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 37888; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 38912; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 39936; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 40960; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 41984; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 43008; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 44032; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 45056; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 46080; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 47104; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 48128; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 49152; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 50176; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 51200; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 52224; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 53248; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 54272; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 55296; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 56320; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 57344; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 58368; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 59392; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 60416; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 61440; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 62464; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 63488; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 64512; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 65536; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 66560; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 67584; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 68608; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 69632; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 70656; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 71680; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 72704; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 73728; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 74752; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 75776; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 76800; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 77824; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 78848; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 79872; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 80896; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 81920; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 82944; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 83968; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 84992; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 86016; changing to 88057. This may result in incorrect timestamps in the ou tput file. [wav @ 0x2897420] Non-monotonous DTS in output stream 0:0; previous: 88057, curr ent: 87040; changing to 88057. This may result in incorrect timestamps in the ou tput file. size= 5188kB time=00:00:29.10 bitrate=1460.2kbits/s speed= 133x video:0kB audio:5188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001920% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: open Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by cehoyos): * status: new => open * reproduced: 0 => 1 * component: undetermined => avformat * priority: normal => minor * version: unspecified => git-master * keywords: => aac regression Comment: Regression since 215db293 / b263f8ff -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:1> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: open Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by Balling): Okay, couple of point here: there is some primaing and remainder and yet we cannot say how much due to it being bare aac (.adts). Also it now regressed further and prints Duration: 00:04:38.71, bitrate: 7 kb/s The correct actual duration ('''with''' priming and remainder) is 30 s 116 ms. Non-monotonous DTS in output stream does not happen. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:2> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: open Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by Jozef Chutka): Hi everyone, considering this error exists for 6 years, is there any recent work ongoing? Or should be aac format in ffmpeg considered unstable? Seems I hit a similar issue reported on https://trac.ffmpeg.org/ticket/9708 . I wonder if there is any workaround? -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: open Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by RutD0g): Bottom line: {{{ ffmpeg -i audio.aac[.adts]/video.ts -c copy audio.m4a/video.mp4 }}} The workaround solution is to use a different container. I have found success muxing AAC audio into MP4/M4A. No need to recode, just -c copy. Replying to [comment:3 Jozef Chutka]:
Hi everyone, considering this error exists for 6 years, is there any recent work ongoing? Or should be aac format in ffmpeg considered unstable?
The best I've been able to figure out is that it's not a bug, it's a limitation of the container represented by the .AAC extension. Adding to the confusion is that the .AAC file extension, unlike MP4/M4A, MKV/MKA, etc., is NOT representing a container of the same or similar name. As someone said elsewhere (I can't remember where) "AAC is a codec, not a container." File extension .AAC is just a synonym for .ADTS, the audio version of .TS for video. These are transport stream containers. I'm unclear why, but TS containers do not include the type of time data that other containers include. At least in the .AAC and .TS files I've dealt with. I first encountered this because some media players are error prone when playing .TS videos. Some players can't play them at all, others play but you can't FF or RW. They are also prone to go on "forever", like a 2 hour video that stretches to 8 hours. Recently working with audio files, I noticed my .AAC audio files were displaying inaccurate times. They play fine, but usually the time estimate (see below) is a little low. When the progress bar hits the "end" it just keeps playing, right up to the time that I originally expected Using ffprobe on an .AAC audio file returns the following: {{{ [aac @ 00000186079e0100] Estimating duration from bitrate, this may be inaccurate }}} And a sample .TS video file has a time related error as well: {{{ [mpegts @ 000001298c210100] start time for stream 2 is not set in estimate_timings_from_pts }}} Most media players figure it out and play the media. And Windows OS also estimates the "length" property in Explorer, but at least with audio files the estimates are always a bit off. The workaround solution is to use a different container. I have found success muxing AAC audio (no need to recode, just -c copy) into MP4/M4A. According to [https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio this TRAC guide], you can also use MKV/MKA, FLV/F4V, and RMVB, but I haven't tested any of those. The workaround solution is to use a different container. I have found success muxing AAC audio into MP4/M4A. No need to recode, just -c copy. {{{ ffmpeg -i audio.aac[.adts]/video.ts -c copy audio.m4a/video.mp4 }}} And ffprobe on these .mp4/.m4a files don't produce any messages about time. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:4> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: closed Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | worksforme regression | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by RutD0g): * cc: RutD0g (added) * status: open => closed * resolution: => worksforme Comment: Everything I said (in other comment) about transport streams and time codes is true, but that wasn't directly adddressing this issue, which now seems to have been fixed. {{{ C:\>ffmpeg -i 1.aac 1.wav ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 10.2.1 (GCC) 20200726 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable- fontconfig --enable-gnutls --enable-iconv --enable-libass --enable- libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo- amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable- libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable- ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable- nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 [aac @ 0742cfc0] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from '1.aac': Duration: 00:04:47.72, bitrate: 7 kb/s Stream #0:0: Audio: aac (LC), 88200 Hz, mono, fltp, 7 kb/s Stream mapping: Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, wav, to '1.wav': Metadata: ISFT : Lavf58.45.100 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 88200 Hz, mono, s16, 1411 kb/s Metadata: encoder : Lavc58.91.100 pcm_s16le size= 5188kB time=00:00:30.11 bitrate=1411.2kbits/s speed= 94x video:0kB audio:5188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001920% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: reopened Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by Balling): * status: closed => reopened * resolution: worksforme => Comment: But FFprobe is still broken. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:6> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: reopened Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by RutD0g): Replying to [comment:6 Balling]:
But FFprobe is still broken.
Here's my perspective, though I'm sure I'm less knowledgeable than you. 1) The command the OP ran which generated non-monotonous DTS errors no longer generates errors and generates a usable .wav. 2) The only problem I see with ffprobe is the inaccurate time ''estimate''. 3) As I detailed in my longer post, every single tool I've tried also gives an inaccurate time estimate on all .AAC files. Windows Explorer, VLC, MPC-HC, archive.org video player, etc. etc. If FFmpeg/FFprobe exhibits the same behavior as every other tool, how is that a bug? I'm grateful that FFmpeg stands alone with the alert message (specific to AAC) warning that the estimate is likely inaccurate. If not for that alert I'd still be stumped. {{{ [aac @ 0000021bf26c1400] Estimating duration from bitrate, this may be inaccurate }}} {{{ C:\>ffprobe 1.aac ffprobe version N-112508-g3c5bceb751-20231025 Copyright (c) 2007-2023 the FFmpeg developers built with gcc 13.2.0 (crosstool-NG 1.25.0.232_c175b21) configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable- avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable- schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --enable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable- libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable- libxvid --enable-libzimg --enable-libzvbi --extra- cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20231025 libavutil 58. 27.100 / 58. 27.100 libavcodec 60. 30.102 / 60. 30.102 libavformat 60. 15.101 / 60. 15.101 libavdevice 60. 2.101 / 60. 2.101 libavfilter 9. 11.100 / 9. 11.100 libswscale 7. 4.100 / 7. 4.100 libswresample 4. 11.100 / 4. 11.100 libpostproc 57. 2.100 / 57. 2.100 [aac @ 0000021bf26c1400] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from '1.aac': Duration: 00:04:38.71, bitrate: 7 kb/s Stream #0:0: Audio: aac (LC), 88200 Hz, mono, fltp, 7 kb/s }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:7> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: reopened Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by Balling): Do you know what a regression is? It was correct in version 2.1.3. The bug is likely because it reads bitrate 7 kb/s instead of 73 kb/s. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:8> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5448: aac: wrong calculation of duration -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: (none) Type: defect | Status: reopened Priority: minor | Component: avformat Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by RutD0g): Gotcha. I see now. Thanks for your patience. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5448#comment:9> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
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