Thanks to the help of musicdvd and chienworks and others, I now know what source to edit from (VOB) and what to render it to (MOV, not MP4, turns out to be necessary, apparently). But I still have a problem trying to perform only one lossy conversion.
Sorry, but I'll have to describe the situation in detail before you see my (hopefully interesting?) problem...
I have a great many regions (hundreds?) established in a Vegas file that points to an AVI file that I digitized from a VHS tape in 2003. From those regions I have rendered a great many little MOV files (one ASL sign language sentence per MOV file), and each one of those MOV files has its own Vegas file in which I did cropping to focus on the signer producing that sentence, plus subtitles at the bottom (text events), one for each sign in the sentence. All that took years and cannot simply be recreated from scratch.
But now I have come across a VOB of the same material that's of much higher quality, and I want to get better versions of all the little MOVs. It ought to work to simply load the whole long VOB file to each little sentence-length Vegas file and trim the VOB file in the Trimmer to show just the area matching the region from which that excerpted sentence was built. This could be done with two Vegas windows: One would show the original big Vegas file with the VOB loaded into it in addition to the AVI it already has; I would copy down the start and finish points of each region. Then I would go to the second Vegas window, the one showing the cropping and sub-titles for the sentence rendered from that region, and key those numbers into the start and finish points in the Trimmer. Then from there, I would have just one lossy conversion for each little MOV file.
But now the PROBLEM: When I made the original AVI file I chopped off the first part (that showed titles, credits, copyrights, etc). If I just load the VOB to the Vegas file in which I built all the many little regions just mentioned, the AVI and VOB files don't line up, so the regions don't pick out the correct material on in the VOB. If only it were possible to slide the VOB track leftward so it lined up with the exiting AVI! But one cannot slide material on the timeline leftward past the timeline's left edge. So what I have done there in the 'big' Vegas file so far has been to Trim the VOB appropriately on its left edge so it lines up with the old AVI file on the timeline.
But that's pointless for each little Vegas file since the numbers of the start and end points I copy down won't match the ones in the actual VOB file loaded there, which still has its actual size, since as you know, trimming doesn't change the original file.
ONE OPTION would be to perform some arithmetic on the start and end numbers for each successive region in the 'big' file to convert them to the appropriate start and end numbers for the corresponding 'little' Vegas file, but that's a lot of math to have to do again and again for each one!
THE OTHER OPTION - at least the only one I can see - is apparently to accept that I must have two lossy conversions, and make them as little lossy as possible. For example if I could chop off the start of the VOB file so that it perfectly matches the start of the AVI this would solve it. The start and end points of each region that I would read off the 'big' Vegas file would then be the correct ones for specifying to the Trimmer in the 'little' Vegas files.
But is there any way to make that first conversion not be lossy at all?
I understand that the video inside a VOB file is MPEG, but after all our earlier discussion about this, I feel skeptical that just Matching Project Properties to the VOB would do the job. Apparently, there would still be choices I'd have to make at render time?
Sorry, but I'll have to describe the situation in detail before you see my (hopefully interesting?) problem...
I have a great many regions (hundreds?) established in a Vegas file that points to an AVI file that I digitized from a VHS tape in 2003. From those regions I have rendered a great many little MOV files (one ASL sign language sentence per MOV file), and each one of those MOV files has its own Vegas file in which I did cropping to focus on the signer producing that sentence, plus subtitles at the bottom (text events), one for each sign in the sentence. All that took years and cannot simply be recreated from scratch.
But now I have come across a VOB of the same material that's of much higher quality, and I want to get better versions of all the little MOVs. It ought to work to simply load the whole long VOB file to each little sentence-length Vegas file and trim the VOB file in the Trimmer to show just the area matching the region from which that excerpted sentence was built. This could be done with two Vegas windows: One would show the original big Vegas file with the VOB loaded into it in addition to the AVI it already has; I would copy down the start and finish points of each region. Then I would go to the second Vegas window, the one showing the cropping and sub-titles for the sentence rendered from that region, and key those numbers into the start and finish points in the Trimmer. Then from there, I would have just one lossy conversion for each little MOV file.
But now the PROBLEM: When I made the original AVI file I chopped off the first part (that showed titles, credits, copyrights, etc). If I just load the VOB to the Vegas file in which I built all the many little regions just mentioned, the AVI and VOB files don't line up, so the regions don't pick out the correct material on in the VOB. If only it were possible to slide the VOB track leftward so it lined up with the exiting AVI! But one cannot slide material on the timeline leftward past the timeline's left edge. So what I have done there in the 'big' Vegas file so far has been to Trim the VOB appropriately on its left edge so it lines up with the old AVI file on the timeline.
But that's pointless for each little Vegas file since the numbers of the start and end points I copy down won't match the ones in the actual VOB file loaded there, which still has its actual size, since as you know, trimming doesn't change the original file.
ONE OPTION would be to perform some arithmetic on the start and end numbers for each successive region in the 'big' file to convert them to the appropriate start and end numbers for the corresponding 'little' Vegas file, but that's a lot of math to have to do again and again for each one!
THE OTHER OPTION - at least the only one I can see - is apparently to accept that I must have two lossy conversions, and make them as little lossy as possible. For example if I could chop off the start of the VOB file so that it perfectly matches the start of the AVI this would solve it. The start and end points of each region that I would read off the 'big' Vegas file would then be the correct ones for specifying to the Trimmer in the 'little' Vegas files.
But is there any way to make that first conversion not be lossy at all?
I understand that the video inside a VOB file is MPEG, but after all our earlier discussion about this, I feel skeptical that just Matching Project Properties to the VOB would do the job. Apparently, there would still be choices I'd have to make at render time?