Monty Montgomery wrote:
You allow your DSLR to choose automatically? I run every setting
manual *period* :-)
Unfortunately, my Canon 500D only has automatic mode, or one can freeze
whatever it picked and see the values by pressing the ISO button in
video mode. That's it. Which kind-of shows that the video mode was
mostly intended for those who buy a DSLR but have no idea about exposure
time and aperture. Given the typical video quality, I'm not surprised.
But anyone who's noticed things like...
"Why is it getting noisier each time I work on it? Why are the colors
shifting? Why did it get fuzzier? Why are all the colors shifted
left half a pixel? or a whole pixel? Why did it get washed out when i
exported it? Why does it keep getting brighter (or darker) when I
don't think I changed anything? Why is there all this color banding in
the output? Why are the dark colors blocky/noisy?" and so one and so
forth should start asking, because there are good answers.
Huh? I would say that anything more than having a hardly noticeable
difference in the noise level is either a bug in the transcoder or a
painful (but sometimes necessary) reduction in the bit rate. The latter
should result in chunks, blocks and noise, but changes in colors and
brightness? Pixel shifts?
I am fully aware of the YUV vs. YCbCr flavors issue, but transcoders
should handle that gracefully. As for those 8-bit issues and extra noise
that is added when moving from one lossy format to another, I would say
that as long as the target format is given a generous bitrate, there's
no reason to get a significant difference when the target is MPEG-2 or
MJPEG, possibly even with MPEG-4 derivatives (H.264 and DIVX). And when
I say "significant" I compare with the original noise generated by the
sensor or the camera's own coding. Which may be low with professional
cameras used in good lighting conditions. On a good day.
Eli
--
Web: http://www.billauer.co.il
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