[BUG] Unable to play FLAC with missing cover art mimetype

[FaridZelli]

Describe the bug:
Moosync skips FLAC files that don't specify a cover art mimetype. Does not apply to ID3/MP3.

Steps to reproduce the behavior:

1. Use any FLAC with front cover art
2. Blank out the cover art mimetype in any tag editor (e.g. Kid3)

Expected behavior:
The song should play normally.

• OS: openSUSE Tumbleweed
• Version 10.2.0 (Flatpak)

Additional context:
I was unable to reproduce this issue with any other player (WMP, VLC, MusicBee).

Screenshots

[Ovenoboyo]

Could you send me the codec information for this file? It seems unlikely that its failing to play due to missing cover art

[FaridZelli]

It seems unlikely that its failing to play due to missing cover art

Yeah it's a weird one, I think it could be a problem with ffmpeg. It's not uncommon for Vorbis tags to be missing the cover art mimetype field. Most players simply ignore it.

Here's the output from ffprobe:

ffprobe version N-67885-gcc86343b96-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      58. 32.100 / 58. 32.100
  libavcodec     60. 35.100 / 60. 35.100
  libavformat    60. 18.100 / 60. 18.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 13.100 /  9. 13.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
  libpostproc    57.  4.100 / 57.  4.100
[flac @ 0x7cdb200] Could not read mimetype from an attached picture.
Input #0, flac, from './Rationale - Tethered.flac':
  Metadata:
    artist          : Rationale
    title           : Tethered
    date            : 2017-02-10
    album           : Vessels
    track           : 4
    disc            : 1
    genre           : Alternative & Pop
    album_artist    : Rationale
    composer        : Tinashé Fazakerley
    bpm             : 112.04
    length          : 206
    organization    : Warner Records/Best Laid Plans
    isrc            : GBAHT1600493
    replaygain_*_gain: -9.1
  Duration: 00:03:26.25, start: 0.000000, bitrate: 732 kb/s
  Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
[STREAM]
index=0
codec_name=flac
codec_long_name=FLAC (Free Lossless Audio Codec)
profile=unknown
codec_type=audio
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=s16
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
initial_padding=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=0
start_time=0.000000
duration_ts=9095625
duration=206.250000
bit_rate=N/A
max_bit_rate=N/A
bits_per_raw_sample=16
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
extradata_size=34
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
DISPOSITION:non_diegetic=0
DISPOSITION:captions=0
DISPOSITION:descriptions=0
DISPOSITION:metadata=0
DISPOSITION:dependent=0
DISPOSITION:still_image=0
[/STREAM]

[Ovenoboyo]

You're right, it does indeed fail to play the audio if the mime-type is missing.
Though it seems its an issue with chromium rather than this app. I tried opening an audio file with missing image mime-type in chromium and even it can't play it. I'd suggest opening up an issue on the chromium bug tracker

I hope to add support for playing audio outside of electron in coming few days which should solve this issue in Moosync