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matroska: do not set invalid default duration if frame rate is zero 

If a video track specifies a zero frame rate (invalid but occurs),
this results in a division by zero and subsequent undefined conversion
to integer.  Setting the default duration from the frame rate only
if the latter is greater than zero avoids such problems.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-04-18 13:48:20 +01:00
parent ac97d47d9b
commit 3c58300269
1 changed files with 1 additions and 1 deletions
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2
libavformat/matroskadec.c
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@ -1342,7 +1342,7 @@ static int matroska_read_header(AVFormatContext *s)
continue;
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
if (!track->default_duration)
if (!track->default_duration && track->video.frame_rate > 0)
track->default_duration = 1000000000/track->video.frame_rate;
if (!track->video.display_width)
track->video.display_width = track->video.pixel_width;