Prior to posting, I read numerous posts related to importing vob files in Premiere. None of them seemed to address the particular problem I am experiencing, and I was hoping to find an answer here in the forums. Here's what I am attempting to accomplish:
1) Export the vob files (there are 4 of them) from a commercial movie DVD to hard disk
2) Import the vob files into a Premiere Pro CS4 4.1 project
3) Build a sequence out of the 4 vob files
4) Replace the sound in two very short segments to eliminate profane language so that my children may watch the movie
5) Import the sequence into Encore CS4 and burn a standard DVD
I was successful in all of the above steps 1-5. So what's the problem? I noticed, when viewing the output DVD, that at a certain point (only a single point) in the movie, the sound was garbled and the frames got 'wonky' (a technical term I picked up from Deke McClelland). My first assumption, was that I had messed something up somewhere in my editing process. When I navigated to the problematic time in my Premiere project, I saw that there was a problem in that at a certain point, the video would flicker, after which the audio would be out of sync with the video and would remain so until the end of the sequence. If instead, I simply navigated within the sequence to a few seconds past where the problematic frames seemed to be, all would be well (audio and video in sync). So, this means to me, that at the point where the problematic frames seem to be, Premiere has trouble interpreting them, and from that point on, the sequence is affected. If the seemingly problematic frames are skipped, then Premiere does not enter its bad state.
The next troubleshooting step was to start afresh, and see if the problem existed prior to making any edits to the sequence (i.e. steps 1-3 above). The problem still existed.
The next troubleshooting step was to see if a media player exhibited the same behavior as Premiere. So I took the same vobs and viewed them with Windows Media Player 11. There was no problem viewing the exact same vob in Media Player 11 that essentially is not viewable in Premiere Pro CS4 4.1. Hmm.
The next troubleshooting step was to see if an encoding program would exhibit the same behavior as Premiere. I imported the same vobs into TmpEnc, and when viewing them, no problems were exhibited.
Although not conclusive, it appears that there is a bug in Premiere Pro CS4 4.1.
Another problem that I noticed with vobs, is that sometimes, Premiere Pro CS4 4.1 does not recognize the proper frame rate of a standard DVD vob file, e.g. given 5 vobs that comprise a single movie, the first vob is shown as simply a video file (i.e. no audio at all) @ 29.97 fps in the Project panel, but the subsequent 4 vobs are recognized correctly as having both audio and video @ 23.976 fps. As before, I validated that the apparently problematic vob (from the Premiere Pro CS4 4.1 point of view) renders/plays perfectly fine in other applications (i.e. no audio or video problems). I attempted to use 'Interpret Footage' to rectify the problem with the vob, and when I type in 23.976 fps, it takes it, but then displays in the Project panel as 23.98 fps. It didn't fix the problem, but I was wondering if diplaying 23.976 as 23.98 (as opposed to 23.976 which is shown for the non-problematic vobs) is another problem.
Thanks much for any and all help,
My system specs, if needed:
OS - Vista Ultimate SP2, x64, fully updated
CPU - Xeon e5440 x 2
RAM - 16 Gb
Master Collection CS4 with all updates installed