[FFmpeg-trac] #7058(undetermined:new): FLAC to AAC sound falls

[FFmpeg]

#7058: FLAC to AAC sound falls
--------------------------------------+----------------------------------
             Reporter:  nol2ter       |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  3.4
             Keywords:  sound falls   |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+----------------------------------
 Summary of the bug:
 AAC At 00:59, the sound goes down.


 How to reproduce #first:
 {{{
 % ffmpeg.exe -i 59s_sound_falls_original.flac -y -c:a aac -b:a 320k -ar
 44100 -movflags +faststart -map 0:a -map_metadata -1 -report
 59s_sound_falls.m4a
 ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 7.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
 --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enab
 le-libsnappy --enable-libsoxr --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-libvorbis --enable-libvo-
 amrwbenc --enable-libmysofa --enabl
 e-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-cuvid
 --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
   libavutil      55. 78.100 / 55. 78.100
   libavcodec     57.107.100 / 57.107.100
   libavformat    57. 83.100 / 57. 83.100
   libavdevice    57. 10.100 / 57. 10.100
   libavfilter     6.107.100 /  6.107.100
   libswscale      4.  8.100 /  4.  8.100
   libswresample   2.  9.100 /  2.  9.100
   libpostproc    54.  7.100 / 54.  7.100
 Input #0, flac, from '59s_sound_falls_original.flac':
   Metadata:
     TITLE           : *deleted
     ARTIST          : *deleted
     ALBUMTITLE      : *deleted
     COMMENT         : *deleted
   Duration: 00:04:31.43, start: 0.000000, bitrate: 1046 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 Stream mapping:
   Stream #0:0 -> #0:0 (flac (native) -> aac (native))
 Press [q] to stop, [?] for help
 Output #0, ipod, to '59s_sound_falls.m4a':
   Metadata:
     encoder         : Lavf57.83.100
     Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
 fltp (16 bit), 320 kb/s
     Metadata:
       encoder         : Lavc57.107.100 aac
 [ipod @ 00000000004d6b40] Starting second pass: moving the moov atom to
 the beginning of the file
 size=   10796kB time=00:04:31.44 bitrate= 325.8kbits/s speed=21.1x
 video:0kB audio:10749kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.433493%
 [aac @ 00000000004abac0] Qavg: 3600.476
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7058>
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