Flac header parse error

[cgbug]

Sample file:
​https://www.sendspace.com/file/58v4t1

Plays correctly with VLC.

ffmpeg version N-100618-gdb738f51de-gca21cb1e36+2 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration:  --cc='ccache gcc' --cxx='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-librtmp --enable-mbedtls --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
  libavutil      56. 63.100 / 56. 63.100
  libavcodec     58.116.100 / 58.116.100
  libavformat    58. 65.101 / 58. 65.101
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 95.100 /  7. 95.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[flac @ 0000000000374d40] invalid sync code
[flac @ 0000000000374d40] invalid frame header
[flac @ 0000000000374d40] decode_frame() failed
Input #0, flac, from 'header_parse_error.flac':
  Metadata:
    DISCTOTAL       : 1
    TRACKTOTAL      : 4
    TITLE           : ラブソング
    ARTIST          : テレサ・ワーグナー(CV:石見舞菜香)
    ALBUM           : ラブソング
    GENRE           : Anime
    album_artist    : テレサ・ワーグナー(CV:石見舞菜香)
    disc            : 1
    DATE            : 2018
    track           : 1
  Duration: 00:05:19.29, start: -0.092880, bitrate: 1073 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
    Stream #0:1: Video: png, rgb24(pc), 1080x1080, 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Cover (front)

[Balling]

And it plays in ffplay too, what is your point?

[Balling]

He just did not like the warnings, I suppose.

[cgbug]

Playback failed with LAV Filters. I will contact its dev about the issue.

Can you confirm if the "decode_frame() failed" error is due to corrupt data? I was concerned there possibly might be a bug when parsing the first frame.

[cgbug]

Sorry for re-opening this. But I think the errors shown in the log might be due to a bug in the coverart parsing causing it to look in wrong position for first frame.

[Carl Eugen Hoyos]

What do you mean with I think?
Which application can deal with the file you provided?

[Elon Musk]

File is not supported at all with reference flac implementation.
File is 100% invalid.

[cgbug]

For example Audacity has not issue opening it (with libflac) and shows no errors in its log.

There have been other bugs in FFmpeg in the past with parsing coverart/id3/metadata. So I am just trying to be helpful with identifying potential bugs, as this looked similar in my eyes. Not wanting to be annoying.

[Carl Eugen Hoyos]

Replying to richardpl:

File is not supported at all with reference flac implementation.

I get bit-identical output with the reference decoder and FFmpeg.