>> yes, I thought about it before, but it's only usable for
>> very short video - do you know how big will be 60 minutes avi or raw?
>> I think buying so big memory is not worth results...
True, uncompressed video gets big quickly:
720*480 = 345600 pixels/frame
345600 * 30 frames/s = about 10 megapixels/second
10 Mpix/s * 60 s = 600 Mpix/minute
600 Mpix/min * 60 min = 36000 Mpix/hour
If you're working in black and white then 1 pixel = 1 byte, which works out to 36
GB/hour. If you keep 16 bits per pixel, eg. 4:2:2 or RGB565, then that's 72 GB/hour.
And 24 bit RGB would be 108 GB/hour.
Clearly 100 gigabytes of RAM is out of the question, but 100 gigabytes of disk is not
wildly expensive anymore. And data rates of 20-30MB/s are not hard to achieve either.
But most people would recommend compression to bring both data rates and size down to
a more reasonable level.
n
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