[ogg-dev] Fixing ogg vorbis corruption caused by bad metadata

[Adam Rosi-Kessel]

Monty Montgomery wrote, on 6/25/2009 1:10 PM:
> Vorbose -v reports the following for the beginning of the file:
>
> INFO   page: Capture pattern OggS, format version 0
>               Flags: first page of logical stream
>
>               Granule position: 0x0000000000000000
>               Stream serialno : 0x490f5cff
>               Sequence number : 0
>               Checksum        : 0xee9c02b9
>               Total segments  : 1
>               Total packets   : 1 completed
>                                ( 30)
>
> info header: Vorbis identification header parsed:
>               Stream version     : 0
>               Output channels    : 2
>               Output sample rate : 44100 Hz
>               Bitrate targets    : unset/224000/unset
>               Block sizes        : 256/2048 samples
>
> WARN stream: 53638 bytes of garbage before page 1
>
> info stream: All identification header pages parsed.
>               1 logical stream muxed in this link.
>
> INFO   page: Capture pattern OggS, format version 0
>               Flags: packet continued from previous page
>
>               Granule position: 0x0000000000000000
>               Stream serialno : 0x490f5cff
>               Sequence number : 13
>               Checksum        : 0xab096acc
>               Total segments  : 6
>               Total packets   : 1 completed (1 cont)
>                                (255, 255, 255, 255, 255, 113)
>
> In short, this file's Ogg encapsulation is corrupt.  There's no chance
> of this being a vorbis_comment_add_tag() bug as that would be corrupt
> data inside valid Ogg.  The Ogg structure itself is invalid here.

Is there any way to understand exactly how it is invalid? I can 
replicate this corruption simply by adding large album art to any ogg 
file with the latest release of MediaMonkey.

Adam