[FFmpeg-devel] Patch: add sanity checks for bitrate

[Christian P. Schmidt]

I've encountered a .ogm that triggered assertions in libavformat's
estimate_timings_from_bitrate. The root cause was a negative value (-1)
in the vorbis headers of the audio tracks.

Attached patch adds sanity checks to the ogg vorbis parser as well as
the estimate_timings_from_bitrate function.

Regards,
Christian
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