[FFmpeg-trac] #1346(avcodec:new): -aq makes only a minimal output file size difference for aac
FFmpeg
trac at avcodec.org
Tue Jul 23 23:55:35 CEST 2013
#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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