Transcode fails when album art is a video track with odd numbered width/height.

chaos commented

2023-10-18 15:02:49 +01:00

Owner

To fix this we need to transcode the album art to a more supported format which requires analyzing first with ffprobe and adding extra arguments or transcode steps to convert the video track to a suitable format, applying slight downscale/crop to match format-appropriate values.

We should also add a command which fixes album art on all files to be the appropriate album art format for the container so that album art doesn't need to be re-transcoded every time transcode is run. This should also be added to the process command as well.

We should aim to only use static image formats where possible as this should be more efficient. For example use JPEG or PNG when using mka/mkv only.

Failed Example:

Transcoding
Input #0, flac, from '/home/chaos/Music/vibes/speedy/slower/Akira Complex - Ether Strike.flac':
  Metadata:
    ORGANIZATION    : lowiro
    ARTIST          : Akira Complex
    ENCODER         : reference libFLAC 1.3.1 20141125
    REPLAYGAIN_TRACK_GAIN: -10.90 dB
    DISPLAY ARTIST  : Akira Complex
    DISCTOTAL       : 1
    CONTENTGROUP    : arcaea
    REPLAYGAIN_TRACK_PEAK: 1.244515
    TITLE           : Ether Strike
    COMMENT         : English tracklist https://vgmdb.net/album/91876
    TRACKTOTAL      : 25
    ALBUMSORT       : Arcaea 01
  Duration: 00:02:22.15, start: 0.000000, bitrate: 1178 kb/s
  Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
    Side data:
      replaygain: track gain - -10.900000, track peak - 0.000029, album gain - unknown, album peak - unknown, 
  Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 843x750 [SAR 96:96 DAR 281:250], 90k tbr, 90k tbn (attached pic)
    Metadata:
      comment         : Cover (front)
Stream mapping:
  Stream #0:1 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (flac (native) -> adpcm_g726 (g726))
Press [q] to stop, [?] for help
[libx264 @ 0xc842c0] width not divisible by 2 (843x750)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

To fix this we need to transcode the album art to a more supported format which requires analyzing first with ffprobe and adding extra arguments or transcode steps to convert the video track to a suitable format, applying slight downscale/crop to match format-appropriate values. We should also add a command which fixes album art on all files to be the appropriate album art format for the container so that album art doesn't need to be re-transcoded every time transcode is run. This should also be added to the process command as well. We should aim to only use static image formats where possible as this should be more efficient. For example use JPEG or PNG when using mka/mkv only. Failed Example: ``` Transcoding Input #0, flac, from '/home/chaos/Music/vibes/speedy/slower/Akira Complex - Ether Strike.flac': Metadata: ORGANIZATION : lowiro ARTIST : Akira Complex ENCODER : reference libFLAC 1.3.1 20141125 REPLAYGAIN_TRACK_GAIN: -10.90 dB DISPLAY ARTIST : Akira Complex DISCTOTAL : 1 CONTENTGROUP : arcaea REPLAYGAIN_TRACK_PEAK: 1.244515 TITLE : Ether Strike COMMENT : English tracklist https://vgmdb.net/album/91876 TRACKTOTAL : 25 ALBUMSORT : Arcaea 01 Duration: 00:02:22.15, start: 0.000000, bitrate: 1178 kb/s Stream #0:0: Audio: flac, 44100 Hz, stereo, s16 Side data: replaygain: track gain - -10.900000, track peak - 0.000029, album gain - unknown, album peak - unknown, Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 843x750 [SAR 96:96 DAR 281:250], 90k tbr, 90k tbn (attached pic) Metadata: comment : Cover (front) Stream mapping: Stream #0:1 -> #0:0 (mjpeg (native) -> h264 (libx264)) Stream #0:0 -> #0:1 (flac (native) -> adpcm_g726 (g726)) Press [q] to stop, [?] for help [libx264 @ 0xc842c0] width not divisible by 2 (843x750) Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height ```