Opened 14 months ago

Last modified 10 months ago

#10323 open defect

Incorrect decoding of Monkey's Audio 3.80

Reported by: death Owned by: Michael Niedermayer
Priority: normal Component: avcodec
Version: git-master Keywords: audio, decoding, ape
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

How to reproduce:

ffmpeg -i bigfear.ape bigfear.wav
ffmpeg version 2023-04-17-git-65e537b833-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  6.100 / 58.  6.100
  libavcodec     60.  9.100 / 60.  9.100
  libavformat    60.  4.101 / 60.  4.101
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  5.100 /  9.  5.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
(...)

Output file is incorrect, contains blocks of noise.
Offending file was encoded with Monkey's Audio version 3.80.
https://www.foobar2000.org/temp/bigfear.ape

Attachments (2)

24_bit_fixed_mono_44k_insane.ape (653.8 KB ) - added by ami_stuff 10 months ago.
24_bit_fixed_stereo_44k_insane.ape (717.4 KB ) - added by ami_stuff 10 months ago.

Download all attachments as: .zip

Change History (12)

comment:1 by jeeb, 14 months ago

General info on the sample:

[ape @ 0x3e2f980] Decoding file - v3.80, compression level 4000
[ape @ 0x563f000] Compression Level: 4000 - Flags: 14

comment:3 by Balling, 14 months ago

Status: newopen

Looks like duplicate of #9816. But the file does not open in Adobe Audition.

Last edited 14 months ago by Balling (previous) (diff)

comment:4 by Balling, 10 months ago

That is still broken even after 80ad0e2198df4e2961928d8304da58df6db77ec4. The issue is 192 kHz I imagine.

Last edited 10 months ago by Balling (previous) (diff)

comment:5 by Balling, 10 months ago

Owner: set to Michael Niedermayer

comment:6 by Balling, 10 months ago

BTW, official MAC.exe agrees, it produces wav with md5 that is the same as written in flac header: ffmpeg.exe -i bigfear.wav -c:a pcm_s24le -f md5 -

I.e. 5aa528cf3fe80cea68bf7f7cbea3fc45

BTW if you recompress it to insane level of compression, it will result in smaller file, yet it will still cause artefacts.

Last edited 10 months ago by Balling (previous) (diff)

comment:7 by ami_stuff, 10 months ago

I will attach two more samples with "insane" compression level (monkey's audio 3.99) which decodes with noise

stereo file is interim, mono i'm not sure

by ami_stuff, 10 months ago

by ami_stuff, 10 months ago

comment:8 by ami_stuff, 10 months ago

it looks like 24-bit decoding in ffmpeg is just broken and the problem is not related to some outdated version of monkey's audio encoder, bacause I can create such noisy files with the latest version of encoder as well

Last edited 10 months ago by ami_stuff (previous) (diff)

comment:9 by ami_stuff, 10 months ago

"24_bit_fixed_mono_44k_insane.ape​" and "24_bit_fixed_stereo_44k_insane.ape​" files decodes ok with 20130418-git-ee94362 build, more I didn't test

in reply to:  9 comment:10 by ami_stuff, 10 months ago

Replying to ami_stuff:

"24_bit_fixed_mono_44k_insane.ape​" and "24_bit_fixed_stereo_44k_insane.ape​" files decodes ok with 20130418-git-ee94362 build, more I didn't test

this is ticket #10563 now

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