New Sanyo CA-100, need converting advice

[Blue407]

Hi Guys

Video conversion is all pretty new to me, previous camera was Hi-8!!

Just bought a new Sanyo HD camcorder Xacti CA-100 Full HD 1920x1080.

Capable at recording in these modes:-

Full-HD 1920x1080 60 field/s
Full-SHQ 1920 X 1080 30fps
HD-HR 1280 X 720 60fps
HD-SHQ 1280 X 720 30fps

I have recorded some test videos at Full-HD in MPEG4 standard. (1920x1080 60 field/s)
Playback on PC is quite jerky.

I have a copy of avidemux and would like to use this to enhance the quality of the videos I record.

Q1: Is the best resolution I should be recording at? Playback will almost always be via PC onto HD TV's.

Q2: Advice on best settings in avidemux to get the most out of my recordings? (Want to produce MKV files at end of conversion)

Thx in advance for help/advice given.

[Blue407]

Any ideas guys?