[FFmpeg-trac] #929(avcodec:open): AAC decoder does not respect request_channels (was: AAC 5.1 channel decoding issue)
FFmpeg
trac at avcodec.org
Fri Jan 27 01:08:02 CET 2012
#929: AAC decoder does not respect request_channels
-------------------------------------+-----------------------------------
Reporter: kaijun61 | Owner:
Type: enhancement | Status: open
Priority: wish | Component: avcodec
Version: git-master | Resolution:
Keywords: AAC | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
-------------------------------------+-----------------------------------
Changes (by cehoyos):
* priority: normal => wish
* status: new => open
* type: defect => enhancement
* reproduced: 0 => 1
Comment:
This works at least for ac-3 and eac-3.
{{{
$ ffmpeg -request_channels 1 -i fate-suite/aac/al_sbr_cm_48_5.1.mp4
out.wav
ffmpeg version N-37197-ga8ae00b Copyright (c) 2000-2012 the FFmpeg
developers
built on Jan 27 2012 00:29:41 with gcc 4.5.3
configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
libavutil 51. 34.101 / 51. 34.101
libavcodec 53. 60.100 / 53. 60.100
libavformat 53. 31.100 / 53. 31.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 60.100 / 2. 60.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate-
suite/aac/al_sbr_cm_48_5.1.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
creation_time : 2008-01-22 11:26:59
Duration: 00:00:32.17, start: 0.000000, bitrate: 129 kb/s
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 6
channels, s16, 128 kb/s
Metadata:
creation_time : 2008-01-22 11:26:59
handler_name : soun
Output #0, wav, to 'out.wav':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
creation_time : 2008-01-22 11:26:59
encoder : Lavf53.31.100
Stream #0:0(und): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
6 channels, s16, 4608 kb/s
Metadata:
creation_time : 2008-01-22 11:26:59
handler_name : soun
Stream mapping:
Stream #0:0 -> #0:0 (aac -> pcm_s16le)
Press [q] to stop, [?] for help
size= 18096kB time=00:00:32.17 bitrate=4608.0kbits/s
video:0kB audio:18096kB global headers:0kB muxing overhead 0.000248%
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/929#comment:14>
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