Tim Kolb |
June 4th, 2008 09:12 PM |
Quote:
Originally Posted by Steve Phillipps
(Post 879358)
Take a camera that can record 1080P and 720P. Say it's got a codec with a 50mb/sec data rate. If you're shooting a moving subject, or panning or have a scene with a lot of moving details, would you get a better result recording at 720 because the codec is having to process a lot less info and so has less break-up?
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Since you point out that both choices are progressive, the only way that a codec would influence how motion is preserved in the image would be if it was working as temporal compression...like long GOP MPEG or Windows Media. If you had an I-frame codec (no temporal compression), then how motion is captured will have more to do with the camera (aperture, shutter speed, etc...) than the compression.
Now...that's not to say that the choice of framesize has no affect on -overall- image 'quality'...with a fixed data rate, as you point out, the fewer pixels you're handling, the better the image 'quality' (meaning really 'accuracy' I suppose). However motion specifically won't be affected by framesize choice.
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