As you can see buffer only lasts about 2 seconds at resolution 1152 x 500. I still haven't tested if that is down to memory card speed.
If skipping frames option is switched on there are some pink frames popping up.
Firmware is still in development so don't be surprised if camera crashes. I had several crashes. At one point switching off and on the camera didn't help so battery had to be removed.
Magic Lantern team are doing amazing job giving us all this amazing functionality no matter how limited it is. Keep up good work.