[CptanPanic]

I got a file which is normal size that I watch, but this one is much slower with CPU at 100%. The only difference I see is the audio is now AAC, would that account for it?

Slow video:

Video Codec: x264 (2-pass)
Video Bitrate: 1000 kb/s
Video Framerate: 29.970 FPS
Resolution: 626x464
Audio Bitrate: NDAAC-HE-90kbps
Container: MKV

[arnova]

AFAIK Xbox can't handle x264 properly (requires too much cpu power). You could try to play it with DVDPlayer instead (default is Mplayer) via the "Play using" context menu...

[cold_realms]

It is the AAC as it takes more cpu cycles to decode that. A good way to think of it is "CPU workload increases as compression increases"

[CptanPanic]

It is the AAC as it takes more cpu cycles to decode that. A good way to think of it is "CPU workload increases as compression increases"

Thanks this is what I thought since I have watched h264 videos before.
Thanks.
CP