Opened 11 years ago
Closed 8 years ago
#5179 closed enhancement (fixed)
Native AAC encoder does not respect channelmap assignments
| Reported by: | Mulvya | Owned by: | |
|---|---|---|---|
| Priority: | wish | Component: | avcodec |
| Version: | git-master | Keywords: | aac |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Tried to generate a 4-channel AAC stream with quad(side) layout, but the output MP4 reports stream layout as 4.0. WAV is generated with correct layout. Using Zeranoe static binary.
Generation of dummy stereo source.
ffmpeg -f lavfi -i "aevalsrc=0|0:d=5" null0.mp4 -report 2> null0.log
ffmpeg version N-77715-gfc703f5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, lavfi, from 'aevalsrc=0|0:d=5':
Duration: N/A, start: 0.000000, bitrate: 5644 kb/s
Stream #0:0: Audio: pcm_f64le, 44100 Hz, stereo, dbl, 5644 kb/s
Output #0, mp4, to 'null0.mp4':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.21.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_f64le (native) -> aac (native))
Press [q] to stop, [?] for help
size= 3kB time=00:00:05.01 bitrate= 4.7kbits/s speed=79.6x
video:0kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 122.289612%
[aac @ 00000000003ad8c0] Qavg: 65536.000
Generation of 4 channel AAC in MP4
ffmpeg -i null0.mp4 -lavfi "[0]asplit[a][b];[a][b]amerge[o];[o]channelmap=0|1|2|3:quad(side)[out]" -map "[out]" null1.mp4 2> null1.log
ffmpeg version N-77715-gfc703f5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'null0.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf57.21.101
Duration: 00:00:05.04, start: 0.023220, bitrate: 4 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
Metadata:
handler_name : SoundHandler
[Parsed_amerge_1 @ 00000000029a3cc0] No channel layout for input 1
[Parsed_amerge_1 @ 00000000029a3cc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
Output #0, mp4, to 'null1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf57.21.101
Stream #0:0: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, quad(side), fltp, 128 kb/s (default)
Metadata:
encoder : Lavc57.21.100 aac
Stream mapping:
Stream #0:0 (aac) -> asplit
channelmap -> Stream #0:0 (aac)
Press [q] to stop, [?] for help
size= 4kB time=00:00:05.03 bitrate= 7.1kbits/s speed=46.7x
video:0kB audio:3kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 56.716942%
[aac @ 00000000029a22c0] Qavg: 65536.000
ffprobe null1.mp4
=================
ffprobe version N-77715-gfc703f5 Copyright (c) 2007-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'null1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf57.21.101
Duration: 00:00:05.06, start: 0.023220, bitrate: 7 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, 4.0, fltp, 4 kb/s (default)
Metadata:
handler_name : SoundHandler
Generation of 4-channel WAV
ffmpeg -i null0.mp4 -lavfi "[0]asplit[a][b];[a][b]amerge[o];[o]channelmap=0|1|2|3:quad(side)[out]" -map [out] null1.wav 2> null1wav.log
ffmpeg version N-77715-gfc703f5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'null0.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf57.21.101
Duration: 00:00:05.04, start: 0.023220, bitrate: 4 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
Metadata:
handler_name : SoundHandler
[Parsed_amerge_1 @ 0000000002613c20] No channel layout for input 1
[Parsed_amerge_1 @ 0000000002613c20] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
Output #0, wav, to 'null1.wav':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
ISFT : Lavf57.21.101
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, quad(side), s16, 2822 kb/s (default)
Metadata:
encoder : Lavc57.21.100 pcm_s16le
Stream mapping:
Stream #0:0 (aac) -> asplit
channelmap -> Stream #0:0 (pcm_s16le)
Press [q] to stop, [?] for help
size= 1736kB time=00:00:05.03 bitrate=2822.6kbits/s speed= 157x
video:0kB audio:1736kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005738%
ffprobe null1.wav
=================
ffprobe version N-77715-gfc703f5 Copyright (c) 2007-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, wav, from 'null1.wav':
Metadata:
encoder : Lavf57.21.101
Duration: 00:00:05.04, bitrate: 2822 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, quad(side), s16, 2822 kb/s
Change History (4)
comment:1 by , 11 years ago
comment:2 by , 11 years ago
At least some encoder seems to, according to http://stackoverflow.com/questions/34938715/ffmpeg-mapping-4-audio-channels-to-1-audio-track
specifically
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '4chan.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2016-01-19 04:11:52
Duration: 00:19:58.00, start: 0.000000, bitrate: 5118 kb/s
Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte1
70m/smpte170m/bt709), 768x576, 4955 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc (defa
ult)
Metadata:
creation_time : 2016-01-19 04:11:52
handler_name : Apple Alias Data Handler
encoder : H.264
timecode : 00:28:33:21
Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, quad, fltp,
157 kb/s (default)
Metadata:
creation_time : 2016-01-19 04:11:52
handler_name : Apple Alias Data Handler
Stream #1:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
rotate : 0
creation_time : 2016-01-19 04:11:52
handler_name : Apple Alias Data Handler
timecode : 00:28:33:21
comment:3 by , 8 years ago
| Component: | undetermined → avcodec |
|---|---|
| Priority: | normal → wish |
| Status: | new → open |
| Type: | defect → enhancement |
| Version: | unspecified → git-master |
comment:4 by , 8 years ago
| Keywords: | aac added |
|---|---|
| Resolution: | → fixed |
| Status: | open → closed |
Fixed by Rostislav in fbf295e2bd4d48d7a0a094ed5afce2fa5b6cf35a
See also tickets #7266 and #7273
Note:
See TracTickets
for help on using tickets.
The AAC specifications define only the most common channel map per a given number of channels.
From the code:
So without support for Programmable Channel Elements (PCE) which theoretically allow for custom mapping the encoder cannot output anything outside of those defined presets. Our encoder doesn't support those, and I doubt any other encoder does. I also doubt many decoders support these and correctly do the mapping. So you're out of luck if you still want to use AAC.