#3361: aac_he mono not recogized (reported as stereo)
-------------------------------------+-------------------------------------
Reporter: blacktrash | Owner:
Type: defect | Status: new
Priority: important | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
regression |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by JohnWarburton):
Replying to [ticket:3361 blacktrash]:
> Summary of the bug:
>
> Channel count and channel layout for aac_he mono is always reported
(decoded?) as stereo.
>
Same observed 26 May 2020.
FFmpeg, using libfdk_aac and "profile:a he_aac", believes it is encoding
mono, but on inputting the encoded file, FFmpeg reports stereo and
he_aac_v2.
{{{
ffmpeg -i .\h.mp3 -af dynaudnorm=g=5:r=1:m=20.0:b=1,alimiter=limit=-10dB
-ac 1 -ar 32000 -profile:a aac_he -c:a libfdk_aac mono.aac
ffmpeg version N-97952-g2502e13b07-COMPILED_BY_JohnWarburton Copyright (c)
2000-2020 the FFmpeg developers
built with gcc 10.1.1 (GCC) 20200522
configuration: --arch=x86_64 --target-os=mingw32 --cross-
prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/bin/x86_64-w64-mingw32- --pkg-config
=pkg-config --enable-libjack --disable-doc --enable-libxml2 --enable-
opencl --enable-gpl --enable-libtesseract --enable-libx264 --enable-
avisynth --enable-libxvid --enable-libmp3lame --enable-libmysofa --enable-
version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-
libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-
libgsm --enable-libfreetype --enable-libopus --disable-w32threads
--enable-libcodec2 --enable-frei0r --enable-filter=frei0r --enable-bzlib
--enable-libxavs --enable-libxavs2 --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libvo-amrwbenc --enable-libvpx --enable-libilbc
--enable-libwavpack --enable-libwebp --enable-libgme --enable-libbs2b
--enable-libmfx --enable-librubberband --enable-dxva2 --enable-d3d11va
--enable-nvenc --enable-nonfree --enable-libfdk-aac --enable-libflite
--enable-decoder=aac --enable-libaom --enable-runtime-cpudetect --enable-
libpulse --enable-cuda-nvcc --prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/x86_64-w64-mingw32 --enable-shared
--disable-static --disable-debug --disable-stripping --enable-libsoxr
--enable-fontconfig --enable-libass --enable-libbluray --enable-iconv
--enable-libtwolame --enable-libzvbi --enable-libcaca --enable-libmodplug
--extra-libs=-lstdc++ --extra-libs=-lpsapi --enable-opengl --extra-
libs=-lz --extra-libs=-lpng --enable-libvidstab --enable-decklink --extra-
libs=-loleaut32 --enable-libcdio --enable-libzimg --enable-chromaprint
--enable-libsnappy --enable-libx265 --enable-lv2 --enable-libklvanc
--logfile=/dev/tty --extra-cflags= --extra-
version=COMPILED_BY_JohnWarburton --extra-cxxflags=-Wno-narrowing
libavutil 56. 49.100 / 56. 49.100
libavcodec 58. 87.101 / 58. 87.101
libavformat 58. 43.100 / 58. 43.100
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 83.100 / 7. 83.100
libswscale 5. 6.101 / 5. 6.101
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, mp3, from '.\h.mp3':
Duration: 00:00:44.93, start: 0.025057, bitrate: 103 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, mono, fltp, 103 kb/s
Metadata:
encoder : LAME3.99r
File 'mono.aac' already exists. Overwrite? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (mp3float) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
Output #0, adts, to 'mono.aac':
Metadata:
encoder : Lavf58.43.100
Stream #0:0: Audio: aac (libfdk_aac) (HE-AAC), 32000 Hz, mono, s16, 34
kb/s
Metadata:
encoder : Lavc58.87.101 libfdk_aac
size= 192kB time=00:00:44.89 bitrate= 35.1kbits/s speed=26.3x
video:0kB audio:192kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000000%
}}}
And mediainfo -f reports it's mono:
{{{
$ mediainfo -f mono.aac
General
Count : 308
Count of stream of this kind : 1
Kind of stream : General
Kind of stream : General
Stream identifier : 0
Count of audio streams : 1
Audio_Format_List : AAC
Audio_Format_WithHint_List : AAC
Audio codecs : AAC LC-SBR
Complete name : mono.aac
File name : mono
File extension : aac
Format : ADTS
Format : ADTS
Format/Info : Audio Data Transport Stream
Format/Extensions usually used : aac
Commercial name : ADTS
Codec : ADTS
Codec : ADTS
Codec/Info : Audio Data Transport Stream
Codec/Extensions usually used : aac
File size : 196779
File size : 192 KiB
File size : 192 KiB
File size : 192 KiB
File size : 192 KiB
File size : 192.2 KiB
Overall bit rate mode : VBR
Overall bit rate mode : Variable
Stream size : 0
Stream size : 0.00 Byte (0%)
Stream size : Byte0
Stream size : 0.0 Byte
Stream size : 0.00 Byte
Stream size : 0.000 Byte
Stream size : 0.00 Byte (0%)
Proportion of this stream : 0.00000
File creation date : UTC 2020-05-26 15:01:25.297
File creation date (local) : 2020-05-26 16:01:25.297
File last modification date : UTC 2020-05-26 15:06:00.284
File last modification date (local) : 2020-05-26 16:06:00.284
Audio
Count : 254
Count of stream of this kind : 1
Kind of stream : Audio
Kind of stream : Audio
Stream identifier : 0
Format : AAC
Format/Info : Advanced Audio Codec
Commercial name : AAC
Format version : Version 4
Format profile : HE-AAC / LC
Format settings, SBR : Yes (Implicit)
Format settings, SBR : Yes (Implicit)
Codec : AAC LC-SBR
Codec : AAC LC-SBR
Bit rate mode : VBR
Bit rate mode : Variable
Channel(s) : 1
Channel(s) : 1 channel
Channel positions : Front: C
Channel positions : 1/0/0
ChannelLayout : C
Sampling rate : 32000 / 16000
Sampling rate : 32.0 KHz / 16.0 KHz
Compression mode : Lossy
Compression mode : Lossy
Stream size : 196779
Stream size : 192 KiB (100%)
Stream size : 192 KiB
Stream size : 192 KiB
Stream size : 192 KiB
Stream size : 192.2 KiB
Stream size : 192 KiB (100%)
Proportion of this stream : 1.00000
}}}
But ffmpeg and ffprobe report the file is stereo:
{{{
ffprobe .\mono.aac
ffprobe version N-97952-g2502e13b07-COMPILED_BY_JohnWarburton Copyright
(c) 2007-2020 the FFmpeg developers
built with gcc 10.1.1 (GCC) 20200522
configuration: --arch=x86_64 --target-os=mingw32 --cross-
prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/bin/x86_64-w64-mingw32- --pkg-config
=pkg-config --enable-libjack --disable-doc --enable-libxml2 --enable-
opencl --enable-gpl --enable-libtesseract --enable-libx264 --enable-
avisynth --enable-libxvid --enable-libmp3lame --enable-libmysofa --enable-
version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-
libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-
libgsm --enable-libfreetype --enable-libopus --disable-w32threads
--enable-libcodec2 --enable-frei0r --enable-filter=frei0r --enable-bzlib
--enable-libxavs --enable-libxavs2 --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libvo-amrwbenc --enable-libvpx --enable-libilbc
--enable-libwavpack --enable-libwebp --enable-libgme --enable-libbs2b
--enable-libmfx --enable-librubberband --enable-dxva2 --enable-d3d11va
--enable-nvenc --enable-nonfree --enable-libfdk-aac --enable-libflite
--enable-decoder=aac --enable-libaom --enable-runtime-cpudetect --enable-
libpulse --enable-cuda-nvcc --prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/x86_64-w64-mingw32 --enable-shared
--disable-static --disable-debug --disable-stripping --enable-libsoxr
--enable-fontconfig --enable-libass --enable-libbluray --enable-iconv
--enable-libtwolame --enable-libzvbi --enable-libcaca --enable-libmodplug
--extra-libs=-lstdc++ --extra-libs=-lpsapi --enable-opengl --extra-
libs=-lz --extra-libs=-lpng --enable-libvidstab --enable-decklink --extra-
libs=-loleaut32 --enable-libcdio --enable-libzimg --enable-chromaprint
--enable-libsnappy --enable-libx265 --enable-lv2 --enable-libklvanc
--logfile=/dev/tty --extra-cflags= --extra-
version=COMPILED_BY_JohnWarburton --extra-cxxflags=-Wno-narrowing
libavutil 56. 49.100 / 56. 49.100
libavcodec 58. 87.101 / 58. 87.101
libavformat 58. 43.100 / 58. 43.100
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 83.100 / 7. 83.100
libswscale 5. 6.101 / 5. 6.101
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
[aac @ 0000024422d46a00] Estimating duration from bitrate, this may be
inaccurate
Input #0, aac, from '.\mono.aac':
Duration: 00:00:38.05, bitrate: 41 kb/s
Stream #0:0: Audio: aac (HE-AACv2), 32000 Hz, stereo, fltp, 41 kb/s
}}}
And FFmpeg's stream analysis reports stereo, and HE-AACv2:
{{{
ffprobe -show_streams mono.aac
ffprobe version N-97952-g2502e13b07-COMPILED_BY_JohnWarburton Copyright
(c) 2007-2020 the FFmpeg developers
built with gcc 10.1.1 (GCC) 20200522
configuration: --arch=x86_64 --target-os=mingw32 --cross-
prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/bin/x86_64-w64-mingw32- --pkg-config
=pkg-config --enable-libjack --disable-doc --enable-libxml2 --enable-
opencl --enable-gpl --enable-libtesseract --enable-libx264 --enable-
avisynth --enable-libxvid --enable-libmp3lame --enable-libmysofa --enable-
version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-
libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-
libgsm --enable-libfreetype --enable-libopus --disable-w32threads
--enable-libcodec2 --enable-frei0r --enable-filter=frei0r --enable-bzlib
--enable-libxavs --enable-libxavs2 --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libvo-amrwbenc --enable-libvpx --enable-libilbc
--enable-libwavpack --enable-libwebp --enable-libgme --enable-libbs2b
--enable-libmfx --enable-librubberband --enable-dxva2 --enable-d3d11va
--enable-nvenc --enable-nonfree --enable-libfdk-aac --enable-libflite
--enable-decoder=aac --enable-libaom --enable-runtime-cpudetect --enable-
libpulse --enable-cuda-nvcc --prefix=/home/john/MultimediaTools-
mingw-w64/sandbox/x86_64-w64-mingw32/x86_64-w64-mingw32 --enable-shared
--disable-static --disable-debug --disable-stripping --enable-libsoxr
--enable-fontconfig --enable-libass --enable-libbluray --enable-iconv
--enable-libtwolame --enable-libzvbi --enable-libcaca --enable-libmodplug
--extra-libs=-lstdc++ --extra-libs=-lpsapi --enable-opengl --extra-
libs=-lz --extra-libs=-lpng --enable-libvidstab --enable-decklink --extra-
libs=-loleaut32 --enable-libcdio --enable-libzimg --enable-chromaprint
--enable-libsnappy --enable-libx265 --enable-lv2 --enable-libklvanc
--logfile=/dev/tty --extra-cflags= --extra-
version=COMPILED_BY_JohnWarburton --extra-cxxflags=-Wno-narrowing
libavutil 56. 49.100 / 56. 49.100
libavcodec 58. 87.101 / 58. 87.101
libavformat 58. 43.100 / 58. 43.100
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 83.100 / 7. 83.100
libswscale 5. 6.101 / 5. 6.101
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
[aac @ 0000021fda366b00] Estimating duration from bitrate, this may be
inaccurate
Input #0, aac, from 'mono.aac':
Duration: 00:00:38.05, bitrate: 41 kb/s
Stream #0:0: Audio: aac (HE-AACv2), 32000 Hz, stereo, fltp, 41 kb/s
[STREAM]
index=0
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=HE-AACv2
codec_type=audio
codec_time_base=1/32000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=fltp
sample_rate=32000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/28224000
start_pts=N/A
start_time=N/A
duration_ts=1073864023
duration=38.047903
bit_rate=41375
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
[/STREAM]
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3361#comment:20>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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