How to delete the embedded picture and add lyrics in flac?

Question

According to FLAC Documentation, pictures can be stored in flac audio format, but lyrics (maybe lrc, srt, or even ass/ssa) isn't mentioned in that documentation.

So, how to delete the embedded picture from flac and add lyrics into flac by software run in Linux platform?

(FFmpeg/avconv are preferred.)

Answer 1

Assuming that the embedded artwork is in a flac standard PICTURE block then:

metaflac --remove --block-type=PICTURE flacfile.flac

...ought to do it.

If the artwork is in the old, non-standard b64 encoded format, then:

metaflac --remove-tag=COVERART flacfile.flac

..ought to do it. No idea about the lyrics though.

Source

Relevant: http://linux.die.net/man/1/metaflac