[FFmpeg-user] Removing a metadata tag from a specfic stream

Fri Feb 5 22:21:07 EET 2021

On Feb 5, 2021, at 11:25 AM, Thibeau <vercruyssen.thibeau at gmail.com> wrote:
> 
> Here's the link to a file with all the metadata tags, the values of them
> might slightly differ but nothing that matters.
> https://ufile.io/bgunj34e <https://ufile.io/bgunj34e> (link is only valid for 30 days sadly)

Oh, interesting, you're right.
The issue isn't the metadata for the audio file per se.
You're trying to remove metadata from the album art (which seems to be held on video track 0 of your file)
So maybe the proper question is how to properly target that album cover art's metadata for change.

The obvious approach (targeting it as the first video track) didn't work:
> ffmpeg -y -i '29 My Girl.flac' -metadata:s:v:0 comment= '29 My GirlB.flac'
> ffprobe '29 My GirlB.flac'
[See output below]
(For reference, OP's source file can be downloaded here: https://ufile.io/bgunj34e <https://ufile.io/bgunj34e> )

ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_9 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, flac, from '29 My Girl.flac':
  Metadata:
    ALBUM           : Prodigal Son: Season 1 (Original Television Soundtrack)
    ARTIST          : Nathaniel Blume
    DATE            : 2020
    TITLE           : My Girl
    track           : 29
  Duration: 00:02:55.60, start: 0.000000, bitrate: 1424 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s32 (24 bit)
    Stream #0:1: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 640x640 [SAR 118:118 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Other
Stream mapping:
  Stream #0:1 -> #0:0 (mjpeg (native) -> png (native))
  Stream #0:0 -> #0:1 (flac (native) -> flac (native))
Press [q] to stop, [?] for help
[swscaler @ 0x7f8fa0008000] deprecated pixel format used, make sure you did set range correctly
[flac @ 0x7f8fd0824000] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
Output #0, flac, to '29 My GirlB.flac':
  Metadata:
    ALBUM           : Prodigal Son: Season 1 (Original Television Soundtrack)
    ARTIST          : Nathaniel Blume
    DATE            : 2020
    TITLE           : My Girl
    track           : 29
    encoder         : Lavf58.45.100
    Stream #0:0: Video: png, rgb24(progressive), 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc (attached pic)
    Metadata:
      encoder         : Lavc58.91.100 png
    Stream #0:1: Audio: flac, 44100 Hz, stereo, s32 (24 bit), 128 kb/s
    Metadata:
      encoder         : Lavc58.91.100 flac
frame=    1 fps=0.0 q=-0.0 Lsize=   31013kB time=00:02:55.60 bitrate=1446.8kbits/s speed= 377x    
video:565kB audio:30440kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.026684%
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_9 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, flac, from '29 My GirlB.flac':
  Metadata:
    ALBUM           : Prodigal Son: Season 1 (Original Television Soundtrack)
    ARTIST          : Nathaniel Blume
    DATE            : 2020
    TITLE           : My Girl
    track           : 29
    encoder         : Lavf58.45.100
  Duration: 00:02:55.60, start: 0.000000, bitrate: 1446 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s32 (24 bit)
    Stream #0:1: Video: png, rgb24(pc), 640x640 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Other