Broken alac_at since 5.1

[mertozan]

OS: macOS 11.7
ffmpeg5.1.2 and 5.0.1

5.0.1 working perfectly by this command, but 5.1, 5.1.1 and 5.1.2 is broken

I'm using this command:

./ffmpeg -i Safari_\ Dolby_Digital_Plus.m2ts -map 0:0 -vcodec copy -map 0:1 -acodec alac_at Safari_\ Dolby_Digital_Plus_Out.mkv

ffmpeg 5.0.1 result (success)

./ffmpeg -i Safari_\ Dolby_Digital_Plus.m2ts -map 0:0 -vcodec copy -map 0:1 -acodec alac_at Safari_\ Dolby_Digital_Plus_Out.mkv
ffmpeg version 5.0.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, mpegts, from 'Safari_ Dolby_Digital_Plus.m2ts':
  Duration: 00:01:34.16, start: 600.000000, bitrate: 27062 kb/s
  Program 1 
  Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
  Stream #0:1[0x1100]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1664 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (eac3 (native) -> alac (alac_at))
Press [q] to stop, [?] for help
Output #0, matroska, to 'Safari_ Dolby_Digital_Plus_Out.mkv':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 1k tbn
  Stream #0:1: Audio: alac ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 7.1, s16, 128 kb/s
    Metadata:
      encoder         : Lavc59.18.100 alac_at
frame=    2 fps=0.0 q=-1.0 size=       1kB time=00:00:00.00 bitrate=6432.0kbits/frame=  446 fps=0.0 q=-1.0 size=   23808kB time=00:00:14.81 bitrate=13163.8kbitsframe=  694 fps=686 q=-1.0 size=   54528kB time=00:00:23.09 bitrate=19344.9kbitsframe=  988 fps=653 q=-1.0 size=   90112kB time=00:00:32.90 bitrate=22436.9kbitsframe= 1326 fps=659 q=-1.0 size=  130560kB time=00:00:44.17 bitrate=24210.0kbitsframe= 1594 fps=634 q=-1.0 size=  164608kB time=00:00:53.12 bitrate=25384.9kbitsframe= 1934 fps=641 q=-1.0 size=  203008kB time=00:01:04.46 bitrate=25797.6kbitsframe= 2269 fps=645 q=-1.0 size=  241920kB time=00:01:15.64 bitrate=26199.5kbitsframe= 2615 fps=651 q=-1.0 size=  274176kB time=00:01:27.18 bitrate=25761.0kbitsframe= 2822 fps=646 q=-1.0 Lsize=  294879kB time=00:01:34.20 bitrate=25641.6kbits/s speed=21.6x    
video:277141kB audio:17703kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.011910%

But 5.1 and higher versions gives this result (error)
Assertion ret <= 0 failed at libavcodec/encode.c:220 -->this error message showing

./ffmpeg -i Safari_\ Dolby_Digital_Plus.m2ts -map 0:0 -vcodec copy -map 0:1 -acodec alac_at Safari_\ Dolby_Digital_Plus_Out.mkv
ffmpeg version 5.1.2-tessus Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mpegts, from 'Safari_ Dolby_Digital_Plus.m2ts':
  Duration: 00:01:34.16, start: 600.000000, bitrate: 27062 kb/s
  Program 1 
  Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
  Stream #0:1[0x1100]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1664 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (eac3 (native) -> alac (alac_at))
Press [q] to stop, [?] for help
Output #0, matroska, to 'Safari_ Dolby_Digital_Plus_Out.mkv':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 1k tbn
  Stream #0:1: Audio: alac ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 7.1, s16, 128 kb/s
    Metadata:
      encoder         : Lavc59.37.100 alac_at
Assertion ret <= 0 failed at libavcodec/encode.c:220
zsh: abort      ./ffmpeg -i Safari_\ Dolby_Digital_Plus.m2ts -map 0:0 -vcodec copy -map 0:1

[Carl Eugen Hoyos]

Please confirm that the issue you see is reproducible with current FFmpeg git head, the only version supported on this bug tracker.

[mertozan]

Replying to Carl Eugen Hoyos:

Please confirm that the issue you see is reproducible with current FFmpeg git head, the only version supported on this bug tracker.

-

Latest ffmpeg (ffmpeg-108513-gf1f78e3cf4) 2022-10-04 working successfully.

I didn't think to look at that part. :) Thank you. Ticket can be closed.

Success Log

./ffmpeg -i Safari_\ Dolby_Digital_Plus.m2ts -map 0:0 -vcodec copy -map 0:1 -acodec alac_at Output.mkv
ffmpeg version N-108513-gf1f78e3cf4-tessus Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57. 38.100 / 57. 38.100
  libavcodec     59. 50.100 / 59. 50.100
  libavformat    59. 34.100 / 59. 34.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 49.101 /  8. 49.101
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, mpegts, from 'Safari_ Dolby_Digital_Plus.m2ts':
  Duration: 00:01:34.16, start: 600.000000, bitrate: 27062 kb/s
  Program 1 
  Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
  Stream #0:1[0x1100]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1664 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (eac3 (native) -> alac (alac_at))
Press [q] to stop, [?] for help
Output #0, matroska, to 'Output.mkv':
  Metadata:
    encoder         : Lavf59.34.100
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 1k tbn
  Stream #0:1: Audio: alac ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 7.1, s16, 128 kb/s
    Metadata:
      encoder         : Lavc59.50.100 alac_at
frame=    2 fps=0.0 q=-1.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=  frame=  526 fps=0.0 q=-1.0 size=   30720kB time=00:00:17.51 bitrate=14366.1kbitsframe=  902 fps=899 q=-1.0 size=   78848kB time=00:00:30.06 bitrate=21485.4kbitsframe= 1131 fps=752 q=-1.0 size=  104960kB time=00:00:37.70 bitrate=22804.6kbitsframe= 1409 fps=703 q=-1.0 size=  138752kB time=00:00:46.98 bitrate=24194.3kbitsframe= 1620 fps=647 q=-1.0 size=  168448kB time=00:00:54.02 bitrate=25544.4kbitsframe= 1960 fps=646 q=-1.0 size=  204544kB time=00:01:05.36 bitrate=25634.8kbitsframe= 2255 fps=638 q=-1.0 size=  241920kB time=00:01:15.20 bitrate=26350.9kbitsframe= 2708 fps=668 q=-1.0 size=  283648kB time=00:01:30.32 bitrate=25725.8kbitsframe= 2822 fps=670 q=-1.0 Lsize=  294876kB time=00:01:34.12 bitrate=25664.6kbits/s speed=22.3x    
video:277141kB audio:17700kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.011897%

[mkver]

This makes me believe that 627543f58a3166810b9cd9c8b483678c82a99be9 (fixing a regression caused by 7c05b7951cb47716230c95744240bc60ec5f9433) should be backported to 5.1.

[mkver]

Duplicate of #9866.

[Carl Eugen Hoyos]

But this (valid) report is not fixed yet, no?

[mkver]

It has been fixed in 79bd6a21a04c7c457bfeb53fddc157bbd80cdaac just now.