I installed the latest CM 10.1 "6/12" build from Dhacker. The video issues are resolved but i had a reboot when playing a recorded video from the gallery.
How you can reproduce it is by playing the video then while its playing, and your nav bar is gone, tap the screen to pause it. The phone will soft reboot back to just the CM boot image then back to the lock screen. Same thing happens if you try to watch a video that was recorded horizontally. It all has to do with Gallery..MX player will play anything just fine with this latest Dhacker build.
Its progress though
Also thank you Dhacker for setting the stock default cpu speed back to 1512 MHZ. I was not a fan of having my device come over clocked to 2GHZ and requiring me to "downclock" through performance to the stock settings. Thank you for setting this back