videos choppy on external vga display

[sitlet]

i have a dell vostro laptop (dual core 2.4ghz, gb ram, ati radeon 1150). i use this a lot with a tv tuner to record high def shows to watch later. with the laptop screen, i can playback hd videos perfectly through media player and vlc player, perfect video with no jerky-ness. i recently bought a large lcd tv, and have since hooked up the laptop to the tv via vga. i use the native hd resolution (1280x720) so the hd videos are displayed correctly. but when i try to open the videos with media player, they play fine for a minute or so, then get very jerky and slow down. almost like the cpu cant keep up, but i checked and media player only uses about 20-25%. now, the same videos play ok with vlc, although they arent as smooth and fluid as with media player when its not being jerky. i have went through and changed all video settings to maximum performance, and still nothing helps. i can be watching a video with media player and it starts to get choppy, and if i unplug the vga and open the laptop screen it starts to play fine again. this puzzles me because the vga 1280x720 is less than my laptops screen resolution (1280x800).

anyone know why this is happening? im assuming its the video card, but its just wierd that the video card performs perfectly with the internal screen.

[citanool]

How does MPC-HC compare?

[sitlet]

for some reason, the files dont play with media player classic. i have tried fixing the settings, but can only get audio. the files are all standard mpeg2, aac audio, 1280x720.

[sitlet]

ok i think i may have figured it out. i installed a new mpeg2 codec, and things seems to be working fine now. the only question i have now is, i used gspot and found a bunch of wierd mpg2 codecs on my computer. i tried to unregister them in gspot and get errors in every one. is there another way to uninstall codecs?

[Krispy Kritter]

Give CodecSniper a try.

[sitlet]

well actually i spoke too soon. the videos now play fine in media player classic and still play fine with vlc. but now when i open the video in media player, the video plays fine, its not choppy at all anymore. but the audio is way out of sync, like about 4 seconds. this doesnt happen at all with vlc or classic.

[sitlet]

still cannot get the videos in sync with windows media player. i think i have traced this problem to a "dscaler mpeg2 codec" i found on my machine. i searched and found many other people that have the same problem with this codec. COdec sniper saw the codec, but when i hit delete, nothing happened. i went into safe mode and tried, but it still wouldnt work. i was able to actually find the file that codec sniper listed, and in safe mode i deleted it. is that the same thing that codec sniper would have done? because when i open codec sniper, it still actually shows the dscaler coded listed. i really dont know what else to do here, these files play fine on my other computer with windows media player

EDIT: i think i got it working now. i found a link to the K-lite codec pack, a separate program with that pack scans for bad codecs and gets rid of them. that seemed to get rid of a few broken ones that gspot couldnt. i opened up the file in media player, and at the bottom i saw it said "acquiring codec". it found one and now seems to work fine.