empty output converting from 8ch .aac

[MartinB]

Summary of the bug:
How to reproduce:

% ffmpeg -i 8ch_lfeFiltering_decodeFails.aac output.wav
ffmpeg 4.2 and newest trunk
built on Windows 64bit

I am trying to convert an 8ch .aac file to .wav. VLC is able to play back the file, but with ffmpeg I get an empty (0 byte size) output and several errors printed out in the console.

Command used:
ffmpeg -i 8ch_lfeFiltering_decodeFails.aac output.wav

Error seen:
[aac @ 0000000002a27400] channel element 0.7 is not allocated
Error while decoding stream #0:0: Invalid data found when processing input

tested on 3.4 release, and also from latest trunk.

Note that 8ch_lfeFiltering_decodeFails.aac (also attached) should be similar but was encoded with LFE prefiltering, and decodes properly in both ffmpeg and VLC.

Output from: ffmpeg.exe -v 9 -loglevel 99 -i 8ch_lfeFiltering_decodeFails.aac

ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers

built with gcc 4.9.2 (GCC)
configuration: --prefix=/usr/local/x86_64-w64-mingw32 --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-shared --disable-static
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100

Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
Reading option '-i' ... matched as input url with argument '8ch_lfeFiltering_decodeFails.aac'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input url 8ch_lfeFiltering_decodeFails.aac.
Successfully parsed a group of options.
Opening an input file: 8ch_lfeFiltering_decodeFails.aac.
[NULL @ 00000000007669c0] Opening '8ch_lfeFiltering_decodeFails.aac' for reading
[file @ 0000000000767340] Setting default whitelist 'file,crypto'
Probing aac score:51 size:2048
Probing flac score:13 size:2048
[aac @ 00000000007669c0] Format aac probed with size=2048 and score=51
[aac @ 00000000007669c0] Before avformat_find_stream_info() pos: 0 bytes read:65696 seeks:4 nb_streams:1
[aac @ 0000000002680140] channel element 0.7 is not allocated

Last message repeated 426 times

[aac @ 00000000007669c0] decoding for stream 0 failed
[aac @ 00000000007669c0] Estimating duration from bitrate, this may be inaccurate
[aac @ 00000000007669c0] stream 0: start_time: -326791809695.818 duration: 9.020
[aac @ 00000000007669c0] format: start_time: -9223372036854.775 duration: 9.020 bitrate=435 kb/s
[aac @ 00000000007669c0] Could not find codec parameters for stream 0 (Audio: aac (LC), 7.1, fltp, 435 kb/s): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[aac @ 00000000007669c0] After avformat_find_stream_info() pos: 490874 bytes read:523802 seeks:4 frames:427
Input #0, aac, from '8ch_lfeFiltering_decodeFails.aac':

Duration: 00:00:09.02, bitrate: 435 kb/s

Stream #0:0, 427, 1/28224000: Audio: aac (LC), 7.1, fltp, 435 kb/s

Successfully opened the file.
At least one output file must be specified
[AVIOContext @ 0000000000768280] Statistics: 523802 bytes read, 4 seeks

[MartinB]

Sorry it should have read the '8ch_noLfeFiltering.aac' (also attached) decodes properly

[Carl Eugen Hoyos]

Please reopen this ticket if the issue is reproducible with current FFmpeg git head, the only version supported here.

[MartinB]

Also reproduced. Output file size is 0 byte. Info about tested build:

ffmpeg.exe -v 9 -loglevel 99 -i 8ch_noLfeFiltering_decodeFails.aac

ffmpeg version N-94664-g0821bc4eee Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190807
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 33.100 / 56. 33.100
  libavcodec     58. 55.101 / 58. 55.101
  libavformat    58. 31.104 / 58. 31.104
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 58.101 /  7. 58.101
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
Reading option '-i' ... matched as input url with argument '8ch_noLfeFiltering_decodeFails.aac'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input url 8ch_noLfeFiltering_decodeFails.aac.
Successfully parsed a group of options.
Opening an input file: 8ch_noLfeFiltering_decodeFails.aac.
[NULL @ 0000024f319b8980] Opening '8ch_noLfeFiltering_decodeFails.aac' for reading
[file @ 0000024f319b9300] Setting default whitelist 'file,crypto'
Probing aac score:51 size:2048
Probing flac score:13 size:2048
[aac @ 0000024f319b8980] Format aac probed with size=2048 and score=51
[aac @ 0000024f319b8980] Before avformat_find_stream_info() pos: 0 bytes read:65696 seeks:4 nb_streams:1
[aac @ 0000024f319cac40] channel element 0.7 is not allocated
    Last message repeated 426 times
[aac @ 0000024f319b8980] decoding for stream 0 failed
[aac @ 0000024f319b8980] Estimating duration from bitrate, this may be inaccurate
[aac @ 0000024f319b8980] stream 0: start_time: -326791809695.818 duration: 9.020
[aac @ 0000024f319b8980] format: start_time: -9223372036854.775 duration: 9.020 bitrate=435 kb/s
[aac @ 0000024f319b8980] Could not find codec parameters for stream 0 (Audio: aac (LC), 7.1, fltp, 435 kb/s): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[aac @ 0000024f319b8980] After avformat_find_stream_info() pos: 490874 bytes read:523802 seeks:4 frames:427
Input #0, aac, from '8ch_noLfeFiltering_decodeFails.aac':
  Duration: 00:00:09.02, bitrate: 435 kb/s
    Stream #0:0, 427, 1/28224000: Audio: aac (LC), 7.1, fltp, 435 kb/s
Successfully opened the file.
At least one output file must be specified
[AVIOContext @ 0000024f319c1dc0] Statistics: 523802 bytes read, 4 seeks

[Carl Eugen Hoyos]

Is it possible that you attached a working file but claimed it does not work?

[MartinB]

Sorry don't know how to modify the attachments, but 8ch_noLfeFiltering_decodeFails.aac is the source that fails to decode.

The original 2 attachments were re-named incorrectly (8ch_lfeFiltering_decodeFails.aac​ decodes properly, and 8ch_noLfeFiltering.aac​ decodes to an empty output file)

[Carl Eugen Hoyos]

Not a regression afaict.