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matroskadec: sanitize track time_scale before using it
fix issue628 Originally committed as revision 15280 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -1274,6 +1274,8 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
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av_log(matroska->ctx, AV_LOG_INFO,
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"Unknown/unsupported CodecID %s.\n", track->codec_id);
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if (track->time_scale < 0.01)
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track->time_scale = 1.0;
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av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
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st->codec->codec_id = codec_id;
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