DSLR Video - how does it work? (techincal)

Started Oct 20, 2009 | Discussions thread
BJL Veteran Member • Posts: 9,342
line skipping to due *sensor* analog signal handling speed limits

bob elkind wrote:

Why would anyone do line-skipping if what you say is true?

Perhaps because of sensor speed limitations, in particular moving data off the sensor along its edge, where reading all pixels in the 16:9 HD frame would require that analog signals be handled sequentially at rates like 10MP+ times 24 fps+, faster than sensors designed primarily for still images can handle. (Live View can use quick and dirty subsampling in both directions at lower than HD res., with far lower bandwidth needs.)

Once the image is digitized, video processing speed is easier ... partly because a lot of processing can be done in parallel. Look how cheap HD video cameras like Flips can be.

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Smaller lenses, better in low light, more telephoto reach: choose any TWO.

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