[FFmpeg-trac] #6638(avfilter:new): aresample does not work for unknown channel layouts
FFmpeg
trac at avcodec.org
Tue Sep 5 19:19:55 EEST 2017
#6638: aresample does not work for unknown channel layouts
-------------------------------------+-------------------------------------
Reporter: CoRoNe | Type: defect
Status: new | Priority: normal
Component: avfilter | Version:
Keywords: aresample | unspecified
unknown channel layouts | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
FFmpeg used:
{{{
ffmpeg version N-86763-g341f012-Reino Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 7.1.0 (GCC)
configuration: --arch=x86 --target-os=mingw32 --cross-prefix=/cygdrive/m
/ffmpeg-windows-build-helpers-
master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32-
--pkg-config=pkg-config --pkg-config-flags=--static --extra-version=Reino
--enable-gray --enable-version3 --disable-debug --disable-doc --disable-
htmlpages --disable-manpages --disable-podpages --disable-txtpages
--disable-w32threads --disable-schannel --enable-fontconfig --enable-gmp
--enable-gnutls --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libfdk-aac --enable-libflite --enable-
libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-
libilbc --enable-libmodplug --enable-libmp3lame --enable-libmysofa
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopus --enable-libsnappy --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
libzimg --enable-libzvbi --enable-gpl --enable-avisynth --enable-frei0r
--enable-filter=frei0r --enable-librubberband --enable-libvidstab
--enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid
--enable-avresample --extra-cflags='-march=pentium3' --extra-cflags=-O2
--extra-cflags='-mfpmath=sse' --extra-cflags=-msse --enable-static
--disable-shared --prefix=/cygdrive/m/ffmpeg-windows-build-helpers-
master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32
libavutil 55. 67.100 / 55. 67.100
libavcodec 57.100.104 / 57.100.104
libavformat 57. 75.100 / 57. 75.100
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 95.100 / 6. 95.100
libavresample 3. 6. 0 / 3. 6. 0
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
}}}
----
The last couple of days I've been experimenting with the loudnorm-filter,
but only to find out that something fishy is going on with the aresample-
filter:
{{{
ffmpeg -v 40 -i input.wav -af "loudnorm,aresample=44100" -f null NUL
[graph_0_in_0_0 @ 04bc07a0] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04b29540] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[Parsed_aresample_1 @ 04bc0360] Cannot select channel layout for the link
between filters Parsed_aresample_1 and format_out_0_0.
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
}}}
You'd explicitly have to use "aformat=channel_layouts=stereo" or "-ac 2",
or it will fail.
{{{
ffmpeg -v 40 -i input.wav -af
"loudnorm,aresample=44100,aformat=channel_layouts=stereo" -f null NUL
[graph_0_in_0_0 @ 04bc04a0] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04b29560] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[auto_resampler_0 @ 04bd2400] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2
chl:stereo fmt:dbl r:192000Hz
[Parsed_aresample_1 @ 04b754c0] ch:2 chl:stereo fmt:dbl r:192000Hz -> ch:2
chl:stereo fmt:s16 r:44100Hz
Output #0, null, to 'NUL':
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
}}}
For the video I'm trying to encode I use the adelay-filter next. Strange
thing is that somehow in this case "aformat=channel_layouts=stereo" isn't
needed:
{{{
ffmpeg -v 40 -i input.wav -af "loudnorm,aresample=44100,adelay=1000|1000"
-f null NUL
[graph_0_in_0_0 @ 04bb0b40] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04b29520] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[format_out_0_0 @ 04bd22c0] auto-inserting filter 'auto_resampler_1'
between the filter 'Parsed_adelay_2' and the filter 'format_out_0_0'
[auto_resampler_0 @ 04ba0a00] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2
chl:stereo fmt:dbl r:192000Hz
[Parsed_aresample_1 @ 04bc0320] ch:2 chl:stereo fmt:dbl r:192000Hz -> ch:2
chl:stereo fmt:dblp r:44100Hz
[auto_resampler_1 @ 04d39ee0] ch:2 chl:stereo fmt:dblp r:44100Hz -> ch:2
chl:stereo fmt:s16 r:44100Hz
Output #0, null, to 'NUL':
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
}}}
But it gets weirder. The following encoders (that I've tested) seem to
accept the adelay-filter's output:
{{{
ffmpeg -v 40 -i input.wav -af "loudnorm,aresample=44100,adelay=1000|1000"
-c:a {libfdk_aac,libmp3lame,libtwolame,ac3,flac,alac,tta} -f null NUL
[graph_0_in_0_0 @ 04bc0220] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[graph_0_in_0_0 @ 04bc0520] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04baf760] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[format_out_0_0 @ 04ba0ba0] auto-inserting filter 'auto_resampler_1'
between the filter 'Parsed_adelay_2' and the filter 'format_out_0_0'
[auto_resampler_0 @ 04b91760] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2
chl:stereo fmt:dbl r:192000Hz
[Parsed_aresample_1 @ 04b29580] ch:2 chl:stereo fmt:dbl r:192000Hz -> ch:2
chl:stereo fmt:dblp r:44100Hz
[auto_resampler_1 @ 04d39e40] ch:2 chl:stereo fmt:dblp r:44100Hz -> ch:2
chl:stereo fmt:s16 r:44100Hz
Output #0, null, to 'NUL':
Stream #0:0: Audio: aac (libfdk_aac), 44100 Hz, stereo, s16, delay
2048, 128 kb/s
Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, delay
1105
Stream #0:0: Audio: mp2 (libtwolame), 44100 Hz, stereo, fltp, delay
481, 384 kb/s
Stream #0:0: Audio: ac3, 44100 Hz, stereo, fltp, delay 256, 192 kb/s
Stream #0:0: Audio: flac, 44100 Hz, stereo, s32 (24 bit), 128 kb/s
Stream #0:0: Audio: alac, 44100 Hz, stereo, s32p (24 bit), 128 kb/s
Stream #0:0: Audio: tta, 44100 Hz, stereo, s32 (24 bit), 128 kb/s
}}}
But the following encoders (that I've tested) don't:
{{{
ffmpeg -v 40 -i input.wav -af "loudnorm,aresample=44100,adelay=1000|1000"
-c:a {libopus,libvorbis,aac,wmav2,wavpack} -f null NUL
[graph_0_in_0_0 @ 04bc0520] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04b29580] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[format_out_0_0 @ 04ba0ba0] auto-inserting filter 'auto_resampler_1'
between the filter 'Parsed_adelay_2' and the filter 'format_out_0_0'
[Parsed_aresample_1 @ 04cdb420] Cannot select channel layout for the link
between filters Parsed_aresample_1 and Parsed_adelay_2.
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
}}}
They again need "aformat=channel_layouts=stereo" or "-ac 2".
{{{
ffmpeg -v 40 -i input.wav -af
"loudnorm,aresample=44100,aformat=channel_layouts=stereo,adelay=1000|1000"
-c:a {libopus,libvorbis,aac,wmav2,wavpack} -f null NUL
[graph_0_in_0_0 @ 04baf7e0] tb:1/44100 samplefmt:s16 samplerate:44100
chlayout:0x3
[Parsed_loudnorm_0 @ 04b29620] auto-inserting filter 'auto_resampler_0'
between the filter 'graph_0_in_0_0' and the filter 'Parsed_loudnorm_0'
[format_out_0_0 @ 04b91f40] auto-inserting filter 'auto_resampler_1'
between the filter 'Parsed_adelay_3' and the filter 'format_out_0_0'
[auto_resampler_0 @ 04b83820] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2
chl:stereo fmt:dbl r:192000Hz
[Parsed_aresample_1 @ 04b906a0] ch:2 chl:stereo fmt:dbl r:192000Hz -> ch:2
chl:stereo fmt:dblp r:44100Hz
[auto_resampler_1 @ 04bc0040] ch:2 chl:stereo fmt:dblp r:44100Hz -> ch:2
chl:stereo fmt:flt r:48000Hz
Output #0, null, to 'NUL':
Stream #0:0: Audio: opus (libopus), 48000 Hz, stereo, flt, delay 312,
96 kb/s
Stream #0:0: Audio: vorbis (libvorbis), 44100 Hz, stereo, fltp
Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, delay 1024, 128
kb/s
Stream #0:0: Audio: wmav2, 44100 Hz, stereo, fltp, delay 2048, 128
kb/s
Stream #0:0: Audio: wavpack, 44100 Hz, stereo, fltp, 128 kb/s
}}}
So it seems (if my judgement is correct) that not only aresample, but also
adelay doesn't work for unknown channel layouts.
I guess this issue is quite similar to
https://trac.ffmpeg.org/ticket/5218.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6638>
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