Philips DVP5140: stuttery XviD playback

[MrFriendly]

Happy New Year,

I'm having an infuriating problem with my DVP5140/12 (with 12.06.18.17 firmware) and I'm hoping someone here can help out. The problem occurs with XviD files, which play just fine until the last few (3-15 or so) minutes, when the framerate drops nearly to a halt. It drives me up the wall to watch an entire movie and then not see the end

• It happened with two Verbatim DVD+R's, a Traxdata DVD+RW and a TDK CD-RW. Nero Burning ROM data verification reported everything OK. I also played the problematic portions on my computer and noticed no issues.
• The files don't seem to be to blame either. It happened with 3 different files.
• It happened with both UDF and ISO file systems.

I don't know what the issue could be. I didn't notice "packed bitstream" anywhere in G-spot and I don't know how to find out about consecutive B-frames or even what they are. Help!

[max2]

I do not know but if it makes you feel any better I had slow playback on a few of mine as well but only around the middle of the movie and it doesn't last long. I have no idea what causes it but it is annoying but I can live with it for now.

I wish I knew as well how to fix it maybe we can find a fix.

[MrFriendly]

Maybe if I was a little more sadistic, it would be comforting that other people are having problems too I'm not as lucky as you: after the framerate drops, it doesn't pick up again. That makes the last few minutes of the movies unwatchable.
I enabled the export function in G-spot, then tossed the resulting files in a comparison tool and from what I can tell, the only thing in common is the VIDEO_MPEG4_BVOP value, which is present for the problematic files, but not for the ones that play properly.
Since it looks like I'll have to re-encode, I've taken this to the Newbie conversion forum. I've seen a post about this problem for the DVP642 too, so it doesn't look like fixing it is a priority for Philips. For shame