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avformat/matroskadec: only use the track duration if it exists
No need to multiplying/dividing when we know it's zero. Signed-off-by: Anton Khirnov <anton@khirnov.net>
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@ -3547,7 +3547,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf
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uint32_t lace_size[256];
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int n, flags, laces = 0;
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uint64_t num;
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int trust_default_duration = 1;
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int trust_default_duration;
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ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
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@ -3615,7 +3615,8 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf
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return res;
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}
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if (track->audio.samplerate == 8000) {
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trust_default_duration = track->default_duration != 0;
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if (track->audio.samplerate == 8000 && trust_default_duration) {
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// If this is needed for more codecs, then add them here
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if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
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if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
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