In an MP3 file (container), the album art is stored NOT as metadata but as video stream (with just one frame). When you convert an MP3 file with album art, you might encounter this warning:
Frame rate very high for a muxer not efficiently supporting it. Please consider specifying a lower framerate, a different muxer or setting vsync/fps_mode to vfr.
Obviously, the muxer is confused by the album art. If you use the option c:v copy, that is instruct ffmpeg to copy the album art as is instead of encoding it again, you can avoid this warning.
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