Seeking in H.264/AVC streams doesn't seek to I-frames

There seems to be some kind of issue with seeking in H.264/AVC streams. Tested with both the MP4 and MKV containers and with a multitude of files and it's rather reliably reproducible everywhere.

Steps to reproduce are simply:

load h264 encoded file
seek around a bit in it until your seek lands you on a suitable non-keyframe
watch hilarious amounts of blocking and general garbage until the next IDR-frame.

Since H.264 has both IDR- and i-frames I can imagine this issue being related to something counting the i-frames as real I-frames for seeking purposes, but I probably shouldn't speculate.

Example screenshots: http://uppcon.se/thefluff/fansub/vlc/11.png http://uppcon.se/thefluff/fansub/vlc/05.PNG

Edited Apr 12, 2010 by Jean-Baptiste Kempf

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