I have a video file with audio. The file is 850.5 mb, 1 hour 18 minutes long. At 36 minutes 30 seconds, the video portion freezes, but the audio continues to play. When I play the file in Quicktime, it doesn't lock up. I have catalyst v4.10 build 119. the mac is a dual G5, 2Ghz with 2.5 GB of Ram. The video card is ATI Radeon 9800 pro. I'm running a Maxtor Atlas 10K5_147WLS SCSI hard drive. Any thoughts?

thanks,
Johnny