krystabegnalie Wrote:hmm i have not successfully played mkv files in PMPlayer advance, might resolution of the video affects it?

To be honest, I dunno why he really bothered with MKV.  You can't just put in any MKV.  It's basically got to be the same as an MP4, except in an MKV container.

If you didn't understand that, convert an MP4 for the PSP, then load it into MKVMergeGUI and make an MKV.  That should work on PPA. (though, as you probably noticed, there's really no point in this extra step)