looking for Canon XH G1 and SDI example at DVinfo.net

Mikael Westerstedt · April 23rd, 2007, 01:33 PM

Does anyone have short movie/stills examples from G1 and made from SDI uncompressed.

Have one HV20 pal and thinking about G1 and a decklink card.

Chris Hurd · April 23rd, 2007, 01:50 PM

Uncompressed SDI output is 1.5 Gigabits per second. Surely you don't expect someone to upload a video clip that large to the web? Besides, the primary advantage of SDI output is not that it's uncompressed, but rather the freedom it allows to be captured as any one of a number of different SD and HD formats.

Curt Wrigley · April 23rd, 2007, 02:21 PM

Quote:

Originally Posted by Chris Hurd

Uncompressed SDI output is 1.5 Gigabits per second. Surely you don't expect someone to upload a video clip that large to the web? Besides, the primary advantage of SDI output is not that it's uncompressed, but rather the freedom it allows to be captured as any one of a number of different SD and HD formats.

And; as I understand it would uncompressed played back from video already compressed to hdv on tape. So, I dont think you will see much if any difference in frame grabs vs hdv grabs. Unless you are capturing live?

Mikael Westerstedt · April 23rd, 2007, 02:43 PM

No was a little unclear. Movie clip that been processed and edit from SDI output.
or more how much easier it would be to handle in post than HDV compression.
less noise and so. I do know about the amount Gb to handle. I have started to build a portable raid with 2300 Watt Portable Generator for computer and a few lights. for this project i dont need sound so no problem with loud Generator . Have looked at some XL H1 clip that is probably from SDI.

Barlow Elton · April 23rd, 2007, 03:43 PM

Mikael,

Consider waiting for the new AJA I/O HD. I've captured real 4:2:2 uncompressed from an XL-H1, and even from the analog output of the XH-A1, and there are indeed advantages to this alternative acquisition method if you need the absolute best the camera's are capable of. There really isn't any difference in noise between HDV and SDI, but there is slightly perceptually better color rendition...however...when you have a real 4:2:2 acquisition it does give you a bit more latitude to really push the image in post.

If you're FCP based, the AJA will allow you to capture to a MacBook Pro laptop to the new ProRes codec via Firewire 800. You wouldn't even need a RAID, just and external FW drive or SATA drive. The I/O HD is a cool little box weighing about 7 lbs that has every kind of input and output, and will even cross convert to different HD standards on the fly. This means you can capture 1080i as 720 50p if you want for slow motion overcrank, or just to get out of the interlaced realm.

Just a few thoughts

Curt Wrigley · April 23rd, 2007, 04:22 PM

Barlow,

I am just transitioning to HDV myself. What benefits do you see from capturing "uncompressed" from an hdv tape, when you are just loading it into FCP's new ProRes codec (which is highly compressed hd) Would you not archive the exact same results loading hdv into FCP PRO RES Codec directly via firewire? PRO Res is just acting as an intermediate codec in FCP so FC does not have to deal with the mpg nature of hdv. Mush the way Cineform does in the PC world.

I am curious the benefits you see by capturing "uncompressed" from and HDV source to a compressed PROS RES codec. VS capturing hdv directly tp fcp pro res codec. The key being that unless you are recoding live, the video from your A1 is compressed hdv regardless what port you capture from.

Curt Wrigley

Ian G. Thompson · April 23rd, 2007, 05:18 PM

Curt, I believe he was talking about capturing live from the analog component output and not from the recorded tape..

Mike Gorski · April 23rd, 2007, 10:14 PM

Well when the the HD signal is sent to the tape, isn't it converted to 4:2:0 coloring and 1440X1080i resolution signal? Being able to recorded the image uncompressed at 4:2:2 at 1920 X1080 would be a serious advantage down the road to get maximum quality out of the camcorder with increased computer processing power with portability.

Curt Wrigley · April 24th, 2007, 06:04 AM

Quote:

Originally Posted by Mike Gorski

Well when the the HD signal is sent to the tape, isn't it converted to 4:2:0 coloring and 1440X1080i resolution signal? Being able to recorded the image uncompressed at 4:2:2 at 1920 X1080 would be a serious advantage down the road to get maximum quality out of the camcorder with increased computer processing power with portability.

Yes. But that only occurs if recording live. If you are playing back from tape, you are just capturing an "uncompressed" version of an HDV compressed video.

Mikael Westerstedt · April 24th, 2007, 01:40 PM

analog output of the XH-A1 from looks intrresting, but i using Pc.
could i have same quality with analog A1 as SDI with G1 then i would save lot of money.
of course i will record live.

April 23rd, 2007, 01:33 PM	#1
Mikael Westerstedt Tourist Join Date: Apr 2007 Location: Stockholm, Sweden Posts: 3	looking for Canon XH G1 and SDI example Does anyone have short movie/stills examples from G1 and made from SDI uncompressed. Have one HV20 pal and thinking about G1 and a decklink card.

April 23rd, 2007, 01:50 PM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	Uncompressed SDI output is 1.5 Gigabits per second. Surely you don't expect someone to upload a video clip that large to the web? Besides, the primary advantage of SDI output is not that it's uncompressed, but rather the freedom it allows to be captured as any one of a number of different SD and HD formats. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

April 23rd, 2007, 02:43 PM	#4
Mikael Westerstedt Tourist Join Date: Apr 2007 Location: Stockholm, Sweden Posts: 3	No was a little unclear. Movie clip that been processed and edit from SDI output. or more how much easier it would be to handle in post than HDV compression. less noise and so. I do know about the amount Gb to handle. I have started to build a portable raid with 2300 Watt Portable Generator for computer and a few lights. for this project i dont need sound so no problem with loud Generator . Have looked at some XL H1 clip that is probably from SDI.

April 23rd, 2007, 03:43 PM	#5
Barlow Elton Major Player Join Date: Mar 2005 Location: UT Posts: 945	Mikael, Consider waiting for the new AJA I/O HD. I've captured real 4:2:2 uncompressed from an XL-H1, and even from the analog output of the XH-A1, and there are indeed advantages to this alternative acquisition method if you need the absolute best the camera's are capable of. There really isn't any difference in noise between HDV and SDI, but there is slightly perceptually better color rendition...however...when you have a real 4:2:2 acquisition it does give you a bit more latitude to really push the image in post. If you're FCP based, the AJA will allow you to capture to a MacBook Pro laptop to the new ProRes codec via Firewire 800. You wouldn't even need a RAID, just and external FW drive or SATA drive. The I/O HD is a cool little box weighing about 7 lbs that has every kind of input and output, and will even cross convert to different HD standards on the fly. This means you can capture 1080i as 720 50p if you want for slow motion overcrank, or just to get out of the interlaced realm. Just a few thoughts

April 23rd, 2007, 04:22 PM	#6
Curt Wrigley Regular Crew Join Date: Feb 2005 Posts: 27	Barlow, I am just transitioning to HDV myself. What benefits do you see from capturing "uncompressed" from an hdv tape, when you are just loading it into FCP's new ProRes codec (which is highly compressed hd) Would you not archive the exact same results loading hdv into FCP PRO RES Codec directly via firewire? PRO Res is just acting as an intermediate codec in FCP so FC does not have to deal with the mpg nature of hdv. Mush the way Cineform does in the PC world. I am curious the benefits you see by capturing "uncompressed" from and HDV source to a compressed PROS RES codec. VS capturing hdv directly tp fcp pro res codec. The key being that unless you are recoding live, the video from your A1 is compressed hdv regardless what port you capture from. Curt Wrigley

April 23rd, 2007, 05:18 PM	#7
Ian G. Thompson Major Player Join Date: Jan 2007 Location: Rockledge, Florida Posts: 351	Curt, I believe he was talking about capturing live from the analog component output and not from the recorded tape..

April 23rd, 2007, 10:14 PM	#8
Mike Gorski Regular Crew Join Date: Mar 2007 Location: Hermosa Beach, CA Posts: 163	Well when the the HD signal is sent to the tape, isn't it converted to 4:2:0 coloring and 1440X1080i resolution signal? Being able to recorded the image uncompressed at 4:2:2 at 1920 X1080 would be a serious advantage down the road to get maximum quality out of the camcorder with increased computer processing power with portability.

April 24th, 2007, 01:40 PM	#10
Mikael Westerstedt Tourist Join Date: Apr 2007 Location: Stockholm, Sweden Posts: 3	analog output of the XH-A1 from looks intrresting, but i using Pc. could i have same quality with analog A1 as SDI with G1 then i would save lot of money. of course i will record live.