FCP crashes when capturing uncompressed video/drops frames on playback

Question

I have just started using FCP 6 but had similar problems with 5. FCP seems to work fine with lower data rate captures and playback like DV25. When I try to capture uncompressed 8 or 10 bit SD or HD it will capture for a while then eventually crash. Shorter captures of 20 or so minutes will work ok but then the video will drop frames and stall on playback. It will suggest lowering real time audio tracks, changing the RT settings etc., but it is only a 2 audio track capture with video and RT is already set to dynamic. I have successfully done this before so I know the hardware is capable, I have captured and played back 1.5 hours of continuous 10 bit uncompressed SD without incident. The system hasn't had a lot of other stuff installed on it. It seems like there must be some sort of software conflict.

Answer 1

I am capturing to a Ciprico dual channel U320 array attached to a ATTO UL4D SCSI controller. I don't use the system for these data intensive captures all that often and sometimes I have no problem at all and other times I do. I noticed that the raw movies would play in the quicktime player ok without stalling or dropping frames so the issue seems to be with final cut. The last time I had this problem was with playing back 720p DVCProHD files and it would only play for a few minutes and then give a error message about dropping frames and suggesting lowering the number of audio tracks and changing the RT settings. I am thinking there must be a software conflict. We just installed FCP 6 and this was the first capture I did with it and had the same old problem right off the bat.