VOBs are a form of MPEG2. They have certain parameters that make them DVD ready, however -- 720x480 resolution, 29.97i frame rate, etc.
You can change a VOBs suffix to .mpg and it will still be the same file. An mpeg. The .vob suffix just identifies as a DVD file.
You're not really clear what you're trying to do with this fil. But, if you're planning to use DVD files or even standard definition MPEGs, make sure your project is properly set up for them or you're not going to get good results.
Likewise, if your "progressive scan MPEGs" are not 720x480 resolution, you may want to proceed cautiously. Prior to version 11, the program did not handle a mix of formats or resolutions well.
Thank you Steve. My focus is on the word "parameters". You mention the 720x480 resolution, 29.97 frame rate. What does GSpot focus on that triggers it to say"DVD Ready "VOB" format" as opposed to just saying it is an mpeg stream. AC3 audio? upper or lower field first? etc. Which combination makes it dvd ready vob format?
As I said, it's basically its resolution, frame rate and bit rate.
There may be something else. The Wikipedia article does a great job going into more detail.
The main point is that all VOBs are MPEG2s -- but not all MPEG2s are VOBs.
Besides the acutal MPEG-2 DVD, inside the VOB container, and the Wiki article, this article goes into some detail on VOB's, and what can be inside them: http://forums.adobe.com/message/2298534#2298534
Besides the MPEG-2 format, there are other DVD considerations, such as the Bit-Rate. Also, the Audio can be PCM/WAV, or DD AC3 - it just depends.
Steve & Bill,
Thank you for your info. I am still puzzled but will probably learn more later. These files are .mpg files from my camcorder. I have a screenshot of GSpot which I am hoping you can tell me about.
I guess my basic question after you view this is, do you think I need to do any converting before importing into PrE9? Or will the program produce the same quality of dvd by just importing them as they are?
You can import them as they are, however you need to choose the widescreen preset from the Hard Disk folder and not the DV folder,
as you footage is upper fields first (TFF).