gst_element_query_duration on http stream

[Patrick Fischer]

Hello

I have a problem with determining the duration of a file which is accessed via http. I have a basic question.

My pipeline looks like this:

souphttpsrc -> queue -> typefind -> tsdemux -> queue -> h264parse -> capsfilter -> appsink

the video is a Mpeg-TS which I address in this way:
http://192.168.1.1/test.ts

If I now want to determine the length of the video I use:
gint64 duration = 0;
if (!gst_element_query_duration (pipeline, GST_FORMAT_TIME, &duration)) {
g_print("Could not query current duration.\n");
return 0;
}

I would expect the web server to load the first packets, determine the PTS or PCR and then try to sprint to the end of the file to determine the PTS or PCR there. The duration is then determined from the different. Of course this method would still have the problem with the overrun but apparently GStreamer uses a different method to determine the length.


On the one hand, however, I can see that the end of the file is never loaded and that the calculated duration fluctuates greatly. Every time I query the duration from the pipeline, I get different values. Fluctuate by a few seconds.
I have a file here that is supposedly about 25 minutes long. Only after I have seen the file for 10 minutes, the calculated duration jumps slowly to 30 minutes (which is the correct duration).

How can I get gstreamer to calculate a better duration?
Downloading completely is not an option.

Regards
Patrick

Patrick Fischer
Software Developer
o: 
+49 4307 8358 0
patrick.fischer at vitec.com
www.vitec.com


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