Re: Big Canon Announcement

Kennedy McEwen wrote:
In article <LaydnYEM7ILG8EjUnZ2dnUVZ_rDinZ2d@xxxxxxxxxxxx>, Alan Browne <alan.browne@xxxxxxxxxxxxxxxxxxxxx> writes
Kennedy McEwen wrote:

Having used the specs, I'm 99.9999% certain that it isn't. The HD journey tried to reach a single worldwide standard, however it had to settle on a compromise of mutual compatibility. The compromise is that all HD sets must accept the standard frame rates derived from 50Hz and 60Hz respectively. 20fps isn't one of the recognised frame rates in the HD standards and that is the knub of the problem.

I don't think that an HD display cares what the delivered frame rate is as long as the rate is described in the headers of the data stream.

What you think and what I have experience of certainly differ significantly.

That this does not meet _broadcast_ standards is not relevant, IOW.

Yes it is.

Subjective. A film of a moderately moving subject or slow pan will not affect the viewing of it (although rolling shutter would be a pain if it does that).

Nor would my plasma display flicker. I'm able to take a full screen photo of it at 1/8000 - the pixels are never 'off' between frames.

If what you claimed were true then no HD display would ever show a "Mode not supported" or "Out of Range" message - they do, when presented with something that is not at one of the supported frame rates.

As a camera designer (not conventional video, but output to HD screens) I have had the misfortune of having one HD screen be damaged in preparation for a customer demo and have to be replaced by something similar from exactly the same manufacturer. Whilst the first display happily accepted the video output by the camera, the second got no further than an "Out of range" message. The cause of this problem? 37.5Hz frame rate (halved from the camera's native 75Hz). It took some delving into the software to select 1 frame in 3, to achieve a 25fps output which was accepted by the new screen, but not displayed quite as smoothly. 25fps is an HD standard frame rate. 37.5fps isn't - and neither is 20fps.

If it doesn't conform to the standard then there is no guarantee that it will be accepted by the HD (or Full HD) display - it might, but that is by luck, as in the first display in my example, rather than design.

Even if it does not, then I would expect Canon to provide an upsampler (conversion s/w) to a 'standard' frame rate. I would rather that the display do this by itself, however. The manual for my plasma display is mute or ambiguous on the issue.

I'm not, btw, defending Canon on 20 fps (since I would never buy an SLR for its HD video capability). I simply believe that these issues should be engineered out of display products - they should refresh at a rate dictated to them by the data (to a reasonable limit) and not the reverse.

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    ... The HD journey tried to reach a single worldwide standard, however it had to settle on a compromise of mutual compatibility. ... The compromise is that all HD sets must accept the standard frame rates derived from 50Hz and 60Hz respectively. ... If what you claimed were true then no HD display would ever show a "Mode not supported" or "Out of Range" message - they do, when presented with something that is not at one of the supported frame rates. ... As a camera designer (not conventional video, but output to HD screens) I have had the misfortune of having one HD screen be damaged in preparation for a customer demo and have to be replaced by something similar from exactly the same manufacturer. ...
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