[FFmpeg-trac] #6430(avformat:open): Ogg audio file not detected

[FFmpeg]

#6430: Ogg audio file not detected
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             Reporter:  cgbug        |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  ogg wav      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  1            |
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Changes (by jamrial):

 * analyzed:  0 => 1
 * keywords:  ogg => ogg wav


Comment:

 This file is a pcm WAV file and a Vorbis OGG file stitched together with
 some custom header at the beginning, probably telling whatever handles
 this file (XCom it seems) where to look for either of them.
 ffmpeg is able to parse the ogg part if you force the ogg demuxer because
 ogg_read_header() will search the whole file until it finds the first OggS
 tag, something ogg_probe() does not.

 The chances for this kind of file to ever be properly supported are low to
 null. The ogg probe function could perhaps parse the entire probe buffer
 until it finds the first OggS tag, but even then the pcm WAV part comes
 first so you'd need a big probe buffer for it.

 Just force the ogg demuxer for these files.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6430#comment:2>
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