I use Adobe Premiere Pro CS5.5 on a MacBook Pro with 4GB RAM.
I have a few MPEG-2 (.VOB) files that I want to edit. They are 576i files whose bit-rate is about 8/9 Mbps. When I play them in Quicktime, they are normal, but when I import them into Premiere Pro and play them in the Source Monitor, they become visibly pixelated and distorted for about a second after most shot changes and at other random intervals. The sound can also go out of sync. The problem remains when I export from Premiere. As seen as the file is fine before import, it seems that the problem happens during import.
The project's settings is the "DV - PAL" "Standard 48kHz" preset. I'm not sure what the field dominance is, and I don't know how to find out. Strangely (and this could be important), Premiere Pro seems to think that the video is progressive scan, even though 1) it isn't and 2) the project's settings are interlaced with lower field dominance.
I've been struggling for weeks to find a solution to the problem but nothing seems to work. I have a feeling that it's something simple that I've missed, but I need help, as I'm new to Premiere Pro.
That didn't work. The problems remain - the picture randomly alternates between low and high quality, and the sound is out of sync with the video. Could it be a problem that occurs during import, or whilst it's "indexing" or "conforming" the file? Although, I have tried to play it in the source monitor whilst it was being "conformed" and the problems were evident. What else is there that it could be?
Next question would be what is the source of those VOB files?
Read Bill Hunt on editing a VOB/MPG file http://forums.adobe.com/thread/464549
I am on Win, not Mac, so what is the size of your 2nd, video data, hard drive... and what CPU?
VOB files are compressed, so need a "strong" CPU to decode and edit... in the Win world, an i7 does well
Go to the CS5 Benchmark http://ppbm5.com/ and see how your computer compares
I've discovered an acceptable solution: I convert the MPEG-2 files to DV files and edit them in that format. It isn't ideal - it creates huge files - but it's good enough for now. I've been stressing about this issue for weeks, and now I can stop thinking about it for now. If anybody comes up with a solution, I'll be happy to hear it.