Don't do crazy things with 0/1 framerates
We use 0/1 framerates to mark variable framerates and matroskamux should not try to calculate a frame duration for it. Fixes #571294.
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@ -650,7 +650,8 @@ gst_matroska_mux_video_pad_setcaps (GstPad * pad, GstCaps * caps)
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gst_structure_get_int (structure, "height", &height);
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videocontext->pixel_width = width;
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videocontext->pixel_height = height;
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if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
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if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)
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&& fps_n > 0) {
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context->default_duration =
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gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
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GST_LOG_OBJECT (pad, "default duration = %" GST_TIME_FORMAT,
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