Canon XLH1 does uncompressed 1080i 4:2:2 over HD-SDI - Page 3 at DVinfo.net

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Canon XL H Series HDV Camcorders
Canon XL H1S (with SDI), Canon XL H1A (without SDI). Also XL H1.


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Old September 16th, 2005, 08:25 AM   #31
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Thanks for the link.
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Old September 18th, 2005, 01:04 PM   #32
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Quote:
Originally Posted by Mike Marriage
Do you mean to capture uncompressed HD!!! At 1.5Gb/s! That would take a serious RAID array, especially with 2.5" drives. That is about 35 times faster that the fastest current Firestore!

If the output was compressed to say a 50Mb/s codec first, that would work.
Two points on this compression issue: 1) if you are putting the SDI to a hard disk, why stick to the data rates imposed by a tape transport? Why not let the rate rise as required to maintain a picture quality level? There would be a certain rate at which MPEG2 would be fine, even for blue screen work and this would be way, way below the raw SDI stream data rate. HDV style compression at 100mBS would look perfect in almost all circumstances...and that would steream to a SATA2 drive...no problem.

2) for blue screen why no go one step further and extract and compress the KEY on the fly and store it as an alpha channel, say a 250 level grey scale using LZW compression, then one could compress the actual image data further without damaging the key as a seperate data stream.

Either way we should start thinking outside the box: Canon have kindly presented us with a great, pre-conformed SDI stream...lets make good use of it!! We just have to take that data and make different decisions to those forced on us by the HDV standard...one that suites OUR needs.

The electronics for decoding SDI is off-the-shelf, just look at cards available for computer systems..they are cheap.
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Old September 28th, 2005, 11:57 PM   #33
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I know the cool kids aren't supposed to stoop to using things like this but dammit I haven't had to do without a flip-out screen for 10 or 15 years, I love the range of camera placement you can get from it that you can't get when the eyepiece is chained to your head. Plus I have a glidecam and... ugh... how do you Xl1 veterans do it?
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Old September 29th, 2005, 01:19 AM   #34
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Betsy, I've talked to several companies that import those little LCD monitors that you can put on top of a camera. I asked for a Canon XL version of something like a 4" screen, native 16:9, on a rotating slide rail that would slip onto the EVF mounting channel on the camera body. So far no dice. I bet it would sell like crazy.
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Old September 29th, 2005, 07:26 AM   #35
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I found a company that sells a mount for the EVF rail... I'll look for it and see if I can't find it again...
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Old September 29th, 2005, 07:28 AM   #36
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Yes please, do tell! I'd love to find out who that is!
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Old September 29th, 2005, 07:48 AM   #37
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It actually took a little looking in some other DVInfo forums for me to find out who it was... It's a company that specializes in LCD monitors, specifically 2.35/2.4:1 and 16:9 LCDs... Anyways, if you look here, you'll notice that the monitor is mounted on the XL1 where the EVF goes... I emailed them at one time and I think it was around $100-$150 for this mount by it's lonesome... of course then you need and LCD that fits the multipin connector on the XL series cams... maybe with a diagram of the pins and someone whos good with soldering you could get something that would work... Or maybe this company sells something, I dunno...
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Old September 29th, 2005, 12:18 PM   #38
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Thanks as always Chris and Kevin, nothing's simple in this life, is it? My main worry is that 24F thing. In the past none of those frame modes has been as good as the cameramaker's claimed; let's hope this is the first exception.
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Old September 29th, 2005, 12:58 PM   #39
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How about a Playstation Portable as an external monitor, it's a great screen, can it accept video in?
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Old October 6th, 2005, 07:00 PM   #40
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Why does the Canon XL H1 not uncompressed 1080i 4:4:4 over HD-SDI?
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Old October 6th, 2005, 07:21 PM   #41
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Quote:
Originally Posted by Robert Niemann
Why does the Canon XL H1 not uncompressed 1080i 4:4:4 over HD-SDI?
That is a dynamite question. Why doesn't it? Circuitry limitation?
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Old October 6th, 2005, 11:40 PM   #42
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4:4:4 requires dual link HDSDI. Single HDSDI feed doesn't have enough bandwidth to support 4:4:4.
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Old October 7th, 2005, 12:33 AM   #43
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David, When you said dual link SDI it hit me like a ton of bricks. That's what Liquid Chrome Editors have been asking for. I didn't make the connection because I've only worked in 422. Thanks for the reminder..
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Old October 12th, 2005, 09:48 AM   #44
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Broken link

the "Introduction" link on
http://www.dvinfo.net/canonxlh1/watchdog.php
is broken.
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Old October 16th, 2005, 03:14 AM   #45
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Is the HD-SDI output 8bit, 10 bit or 12 bit 4:2:2 ?
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