It appears that most files except ones I convert using ffmpeg on my system (usually to webm) only show up as white and create the following output in melt:
VDPAU surface underrun [h264 @ 0x7f1f3c0044a0] get_buffer() failed [h264 @ 0x7f1f3c0044a0] thread_get_buffer() failed [h264 @ 0x7f1f3c0044a0] decode_slice_header error [h264 @ 0x7f1f3c0044a0] no frame!
webm files downloaded from youtube using youtube-dl have the same issue.
An example file is https://app.box.com/s/dpiuc8kifodgp7scnfi7
This happens in melt 0.9.0 as well as git20120912.
I run arch linux 64bit with xf86-video-ati 1:7.2.0-1.
Any idea what is happening or how I can provide useful information?
Note: I had reported this as a Kdenlive issue on http://forum.kde.org/viewtopic.php?f=265&t=117076&p=291018