Hello Martin, after after a few months I decided to try again vMix. Unfortunately not everything went well ... There are many problems for the use that I do. The setup is this:

Asus P8P67 WAS Revolution
Intel i5 2310
8Gb RAM (Dual Channel 4x2) Corsair
HDD 500 GB Seagate SATA 6Gb / s
nVidia GeForce GTS450 1GB DDR5
4 x BlackMagic Intensity Pro
Windows 7 ultimate 64-bit

input:
1 - SONY AX-2000 connected via HDMI to Blackmagic Intensity Pro (1)
1 - SONY V1 connected via Composite to Blackmagic Intensity Pro (2)
1 - JVC 110 ProHD connected via Composite to Blackmagic Intensity Pro (3)

output:
1 - External CRT monitor connected via Composite to Blackmagic Intensity Pro (4)

record on file with Decklink MJPEG codec


and these are some problems I found, I hope you can help me:

1 - recording stops by itself randomly, with error "codec has stopped working". This happens after 1 minute or after 30 or after 2 hours. I have to click OK and restart recording. I tried different codecs and happens to everyone. Now I use MJPEG deckling because that's what gives me better results in terms of video quality. This of course does not go so well because I lose my job. In this specific case I solved it using a DVD recorder but I'd rather have a file on which to work.

2 - vMix freezes. During an event, vMix is frozen and the recording file is unreadable. It is a recording of 2 hours and 38 minutes (63 Gb) that SHOULD recover in some way. How can I do?

I stop for now because the list is quite long, but these are the two most serious problems. When I tried vMix few months ago was much more stable in my opinion. I also bought it because I wanted to buy a dedicated PC vMix full. But because there are these problems, I look for now.

Regards