Help with problem software playback

[ultraman36]

Ok so i took a movie and converted it to mpeg4. When i played the video in Nero showtime the video jumps alot. The jumps are constant. I tried the same video in wmp and it played fine so figured it was nero showtime. However I have a small hd-dvd and blu ray sample file (mkv) and tried playing them in vlc player. One of the videos is fine(blu ray) but the hd-dvd version jumps like it did in Nero. I check my cpu usage and it never goes above 20 percent. Has anyone has this problem? I did a search on the internet and find people have this issue when playing from a dvd drive but not a file on their desktop.


My spec are

Asus P5E wifi
e6600
3 gigs of corsair ram
raptor 150 gig
evga 8600 gts
Vista Home Premium
Audigy x-fi sound card

ps my video drivers are up to date

[Baldrick]

What video and audio codec?

I use haali media splitter, ffdshow, ac3filter and media player classic for mkvs and have no playback problems...or some few 1080p h264 will not work that well.

[ultraman36]

One file is just a nero digital mpg4. I have never had this happen before im starting to think i need to reinstall everything