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avidemux: check video stream framerate against avi header frame duration
The former might be bogus in silly cases, and the latter seems to carry more weight.
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1 changed files with 18 additions and 1 deletions
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@ -1502,8 +1502,25 @@ gst_avi_demux_parse_stream (GstAviDemux * avi, GstBuffer * buf)
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GST_WARNING_OBJECT (avi, "Failed to parse strh chunk");
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goto fail;
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}
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/* determine duration as indicated by header */
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strh = stream->strh;
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/* sanity check; stream header frame rate matches global header
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* frame duration */
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if (stream->strh->type == GST_RIFF_FCC_vids) {
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GstClockTime s_dur;
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GstClockTime h_dur = avi->avih->us_frame * GST_USECOND;
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s_dur = gst_util_uint64_scale (GST_SECOND, strh->scale, strh->rate);
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GST_DEBUG_OBJECT (avi, "verifying stream framerate %d/%d, "
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"frame duration = %d ms", strh->rate, strh->scale,
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s_dur / GST_MSECOND);
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if (h_dur > (10 * GST_MSECOND) && (s_dur > 10 * h_dur)) {
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strh->rate = GST_SECOND / GST_USECOND;
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strh->scale = h_dur / GST_USECOND;
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GST_DEBUG_OBJECT (avi, "correcting stream framerate to %d/%d",
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strh->rate, strh->scale);
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}
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}
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/* determine duration as indicated by header */
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stream->hdr_duration = gst_util_uint64_scale ((guint64) strh->length *
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strh->scale, GST_SECOND, (guint64) strh->rate);
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GST_INFO ("Stream duration according to header: %" GST_TIME_FORMAT,
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