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too much CPU for what it is doing. You can help us by confirming this
observation. I came to that conclusion by running oprofile over my
pipeline. The symbole that was using all the CPU was
scan_for_start_code() within the mpegvideo parser.

Let me know if that is the same issue, that would greatly help. Please
report any useful information on the bug report,
https://bugzilla.gnome.org/show_bug.cgi?id=672701

cheers,
Nicolas