[FFmpeg-trac] #5448(avformat:closed): aac: wrong calculation of duration

[FFmpeg]

#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>
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