Well I found why it is happening, but I cannot explain it.
In the asfdemux plugin in gstreamer the framerate is set bizarrely if
not known. The code from gstasfdemux.c in the
gst_asf_demux_process_chunk function shows why 5fps:
...
if (!stream->fps_known) {
if (!stream->cache) {
stream->cache = stream->payload;
} else {
gdouble fps;
gint64 diff;
gint num, denom;
/* why is all this needed anyway? (tpm) */
diff = GST_BUFFER_TIMESTAMP (stream->payload) -
GST_BUFFER_TIMESTAMP (stream->cache);
fps = (gdouble) GST_SECOND / diff;
/* artificial cap */
if (fps >= 50.0) {
num = 50;
denom = 1;
} else if (fps <= 5.0) {
num = 5;
denom = 1;
} else {
/* crack alert */
num = (gint) GST_SECOND;
while (diff > G_MAXINT) {
num = num >> 1;
diff = diff >> 1;
}
denom = (gint) diff;
}
stream->fps_known = TRUE;
stream->caps = gst_caps_make_writable (stream->caps);
gst_caps_set_simple (stream->caps,
"framerate", GST_TYPE_FRACTION, num, denom, NULL);
GST_DEBUG ("set up stream with fps %d/%d", num, denom);
gst_pad_use_fixed_caps (stream->pad);
gst_pad_set_caps (stream->pad, stream->caps);
ret = gst_asf_demux_push_buffer (demux, stream, stream->cache);
stream->cache = NULL;
ret = gst_asf_demux_push_buffer (demux, stream, stream->payload);
stream->payload = NULL;
}
...
So this is a case where it doesn't know the framerate, but sets it
anyway, to the wrong value.
As I said above, I cannot explain why this is the case.
--
Totem uses wrong framerates for streaming video
https://bugs.launchpad.net/bugs/172493
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