[FFmpeg-trac] #1346(avcodec:new): -aq makes only a minimal output file size difference for aac

[FFmpeg]

#1346: -aq makes only a minimal output file size difference for aac
------------------------------------+-----------------------------------
             Reporter:  cehoyos     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  aac         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by llogan):

 The behavior has changed, but I am unsure of which commits are
 responsible:

 {{{

 $ ffmpeg -y -i fate-suite/lossless-audio/luckynight-partial.tta -c:a aac
 -strict experimental -q:a 0.1 -t 8 ../0.1.aac
 ffmpeg version N-54901-g55db06a Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jul 23 2013 13:37:06 with gcc 4.8.1 (GCC)
   configuration: --prefix=/usr --extra-libs=-ldl --enable-gpl --enable-
 libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
 --enable-libvorbis --enable-libx264 --enable-nonfree --enable-x11grab
   libavutil      52. 40.100 / 52. 40.100
   libavcodec     55. 19.100 / 55. 19.100
   libavformat    55. 12.102 / 55. 12.102
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 81.102 /  3. 81.102
   libswscale      2.  4.100 /  2.  4.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, tta, from 'fate-suite/lossless-audio/luckynight-partial.tta':
   Duration: 00:01:00.48, start: 0.000000, bitrate: 138 kb/s
     Stream #0:0: Audio: tta, 44100 Hz, stereo, s16
 Output #0, adts, to '../0.1.aac':
   Metadata:
     encoder         : Lavf55.12.102
     Stream #0:0: Audio: aac, 44100 Hz, stereo, fltp, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (tta -> aac)
 Press [q] to stop, [?] for help
 [tta @ 0x250a9c0] CRC error
 [output stream 0:0 @ 0x250a680] 100 buffers queued in output stream 0:0,
 something may be wrong.
 size=      14kB time=00:00:08.01 bitrate=  14.5kbits/s
 video:0kB audio:12kB subtitle:0 global headers:0kB muxing overhead
 20.019879%
 }}}

 {{{
 $ ffmpeg -y -i fate-suite/lossless-audio/luckynight-partial.tta -c:a aac
 -strict experimental -q:a 10 -t 8 ../10.aac
 ffmpeg version N-54901-g55db06a Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jul 23 2013 13:37:06 with gcc 4.8.1 (GCC)
   configuration: --prefix=/usr --extra-libs=-ldl --enable-gpl --enable-
 libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
 --enable-libvorbis --enable-libx264 --enable-nonfree --enable-x11grab
   libavutil      52. 40.100 / 52. 40.100
   libavcodec     55. 19.100 / 55. 19.100
   libavformat    55. 12.102 / 55. 12.102
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 81.102 /  3. 81.102
   libswscale      2.  4.100 /  2.  4.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, tta, from 'fate-suite/lossless-audio/luckynight-partial.tta':
   Duration: 00:01:00.48, start: 0.000000, bitrate: 138 kb/s
     Stream #0:0: Audio: tta, 44100 Hz, stereo, s16
 Output #0, adts, to '../10.aac':
   Metadata:
     encoder         : Lavf55.12.102
     Stream #0:0: Audio: aac, 44100 Hz, stereo, fltp, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (tta -> aac)
 Press [q] to stop, [?] for help
 [tta @ 0x2c899c0] CRC error
 [output stream 0:0 @ 0x2c89680] 100 buffers queued in output stream 0:0,
 something may be wrong.
 size=     464kB time=00:00:08.01 bitrate= 474.7kbits/s
 video:0kB audio:462kB subtitle:0 global headers:0kB muxing overhead
 0.511038%
 }}}

 Ticket #2686 may introduce more changes.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1346#comment:2>
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