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How to maintain source file quality in final project?
1. If I’m working with an MPEG-2 source file that is small enough to fit on a finished DVD as is (i.e. less than 4.7GB or whatever the true number is), should I always be trying to maintain those same source file specs — frame pixel dimensions, frame rate, audio and video bitrates, anything else? — so that the video file on the finished DVD has the same specs as the source?
Because theoretically, it seems that there’s no reason to upsample a shorter clip just because there’s room on the DVD to do it, because the quality isn’t going to get any better (like taking a bad Kodak Instamatic negative and blowing it up). And any downsampling is going to compromise quality (and there wouldn’t be any reason to make it smaller, assuming I have room on the finished DVD). Is that all correct?
2. If the answer to #1 is yes, how can I guarantee that I maintain those source file specs when (a) creating renderings in Vegas (for example, if I need to resequence the video without using correction filters or just add chapter markers), or (b) when using the entire source file in a DVDA project?
3. Where in Vegas can I get a source file’s complete specs? When I click on a clip on the timeline and select properties, I get pixel dimensions and ratio, and frame rate. But MPEG Streamclip provides more information, notably two different bitrates, one for the entire file, and a different one for the video track (and what does THAT mean? how can it have two different bitrates in the same file?).
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1 Reply
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If you check no recompression for long GOP rendering in your Preferences, and your rendering to the exact format with no effects, resising or transitions you should see no recrompression needed on your preview screen as your rendering, at least in Vegas Pro 8.
At least thats been my experience. Hope this helps, Danny Hays
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