[FFmpeg-devel] [PATCH] Fix bad ID3v2 tag length

[misc at atomas.com]

(this time with the attached git-format patch !)

The Id3v2 tag is set to a wrong size (14 bytes too large), when a CTOC
frame is included. It makes decoders believe the first MP3 frame is inside
the ID3v2 tag, and hence mungle the first mp3 frame.
The code source uses a hardcoded "16" magic value that is incorrect. (it
should be "2")

This patch fixes this bug *without* using magic values.

See:
https://github.com/gbouthenot/mp3splitter-js/issues/2
https://github.com/openaudible/openaudible/issues/258

Thank you !
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