[FFmpeg-devel] [PATCH] common ID3v2 support for all formats

[Reimar Döffinger]

Hello,
considering issue 2258 I think it is a valid conclusion that people
will prepend a ID3v2 header to anything that can't run aways fast enough
(and then give it a .mp3 extension...).
So I propose attached patch that moves that parsing to common code.
Note that is assume that due to buffering the ID3 parsing attempt
will not cause any issues even on non-seekable input.
Note that I have no idea WTF the mpc demuxer code is doing there,
my conclusion was that it should be safe to just throw it all away,
but I'm not 100% sure I don't miss some subtlety.
Mostly unrelated, but one issue with this whole ID3 handling is
that AFAICT it will use the file-specific metadata conversion
instead of using always the ID3 one.
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