RatVega
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Sep 20, 2005, 2:58 PM
Post #2 of 2
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Re: [avguy75] Creating mpeg, avi, or mp4s at a small rate?
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hey, 47MB ain't bad, DV would be about a quarter gig!
Sorry, I couldn't resist...
First of all, you can do everything you need to in QuickTime Pro using MPEG-4. .mov files will always be larger, and MPEG-1 is "totally 20th Century" (i.e., crappy). Compressor will be great for batch processing once you get a handle on your encoding specs.
The biggies for file size are:
Frame size - smaller frames shrink your file size big time.
Quality settings - Check out how bad "medium" is... most web video isn't "best."
Frame rate - Most of the web video I've seen is 15fps and down. Play with the frame rate to see when your video starts jerking unacceptably.
Keyframe frequency - this decides how often actual video frames are inserted vs. frames generated by estimation in the encoder.
Every video clip is a bit unique, so the best approach (until you become familiar with encoding) will be to generate short test clips to evaluate for size and quality. You'll get a sense for what gets you the compromise you're looking for.
As an example of how good it can get, check out the "quicktours" for Final Cut Studio on the Apple web site. Those clips were produced in HD and downsized for the web - the shorter (around a minute) ones are around 3-6 MB as I recall. I can't remember the exact compression specs or who called them (it wasn't me...) but with a little practice you should be able to get similar results.
Finally, H.264 (available in QT7) is even better and definitely the wave of the future, but not as widely supported as you might need immediately. Keep your eye on it!
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Currently on a loaded 2.5GHz G5 dualie/5GB/1TB internal RAID/dual 19" monitors. Final Cut Studio, Adobe Suite, Boris RED. Shooting with Canon.
VU California Crew, Inland Empire Sub-Chapter (paragraph?)
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Creating mpeg, avi, or mp4s at a small rate?
