Wearable Computer System for HD Capture

[Andrew Plumb]

Have you tried playing around with setting CPU affinity?

The encoder may not be multi-threaded, but if you can set the capture process to one core and the encoder process to the other, you might be able to speed things up a bit more.

[David Newman]

The CineForm encoder is N-way threaded, it use all the cores it finds for improved performance.

[Andrew Plumb]

Thanks for the clarification, David.

...And looking back through the thread I see that Kevin did have better success with the Cineform encoder. It was just the BlackMagic codec that didn't appear to be multi-threaded. D'oh!

[Serge Victorovich]

Originally Posted by Kevin Kondra

Serge,

I don't understand why I would want to capture the HDMI/1080i signal with NeoHDV? Was there ever a consensus on how the HV20 processes the video signal internally to HDMI and HDV (is HDMI output just an upconverted HDV signal?)

Because:
a) you have cpu usage 99% when do capture upscaled 1920x1080 10 bit stream.
b) cost of codec - NeoHDV $249 vs NeoHD $599.

NeoHD is pretty expensive so I'm not buying it quite yet.

c) HDMI output from HV20 is 1440x1080/4:2:2/8 bit. NO 1920x1080 10 bit ! HDV is heavy compressed mpeg2 4:2:0 8bit
NeoHDV can remove 2:3 puldown (do inverse telecine) and fully utilize output 1440x1080/4:2:2/8 bit from HV20.

But after intensive tests you already have own opinion, and money for right choice :)

[Kevin Kondra]

Serge,

The HDMI output on my HV20 runs at 1920*1080/60i. That's part of the reason to record the HDMI output, aside from the higher quality 4:2:2/8 bit color. Only the HDV is 1440*1080.

[Serge Victorovich]

Originally Posted by Kevin Kondra

Serge,

The HDMI output on my HV20 runs at 1920*1080/60i.

I have different information from people who have measuring devices :)
Its same mistake as 10 bit output from HV20 and 10 bit input of Intensity.

David Newman wrote on blog: "Other HV20 misinformation : when recording the Canon HV20 to tape, the image is 1440x1080, that is the HDV standard used. It is not 1920x1080, you only get that out of the HDMI port, and even then the image is likely upsized from an internal 1440x1080 image (which is still very nice.) The 1920x1080 native image is only available in the still camera mode."

That's part of the reason to record the HDMI output, aside from the higher quality 4:2:2/8 bit color. Only the HDV is 1440*1080.

We have different preferences:) For me is color 4:2:2 with 1440x1080 better than 4:2:0 with 1920x1080. Also i prefer 1280x720p60 to 1920x1080i60.

[Kevin Kondra]

Yes, thank-you for pointing this out for me. It's likely the HV20 upsamples a 1440*1080 image to 1920*1080 for HDMI output. I found Heinz Bihlmeir's review of this done in March. Luckily this limitation is on the camera, not on my computer.

[Serge Victorovich]

Kevin, i've seen screenshots. You do not set "remove pulldown" option on HDlink preset for 24p?

[Ian G. Thompson]

Originally Posted by Serge Victorovich

I have different information from people who have measuring devices :)
Its same mistake as 10 bit output from HV20 and 10 bit input of Intensity.

David Newman wrote on blog: "Other HV20 misinformation : when recording the Canon HV20 to tape, the image is 1440x1080, that is the HDV standard used. It is not 1920x1080, you only get that out of the HDMI port, and even then the image is likely upsized from an internal 1440x1080 image (which is still very nice.) The 1920x1080 native image is only available in the still camera mode."



We have different preferences:) For me is color 4:2:2 with 1440x1080 better than 4:2:0 with 1920x1080. Also i prefer 1280x720p60 to 1920x1080i60.

If you read on David only suggests that it "might" be 1440x1080 through HDMI (blown up to 1920x1080). It is still unknown whether it is true 1920x1080 from the sensors to HDMI out. Personally I believe it's the latter.

[Joseph H. Moore]

When considering the whole 1920 vs 1440 debate, it is important to remember that the 1440 pixels are video pixels (i.e. taller than wide) and the 1920 pixels are computer pixels (square.) Remarkably, when you correct the aspect ratio 1440 becomes 1920 ... crazy how that works, huh? ;-)

My point is, you're looking at the relative loss of horizontal detail equivalent to a modest anamorphic squeeze, which is minimal.

That said, after monitoring a test image live via HDMI on a 37" 1080P monitor, and knowing that the HV20's sensor captures and even larger image, I'm left with the opinion that the HV20 is not uprez'ing on the way out to HDMI -- the image is just too clean and sharp. It's really quite amazing how much better the image is before being mangled by HDV ... enough to convince me that I had to buy and Intensity and build a capture station.

[Serge Victorovich]

Originally Posted by Ian G. Thompson

If you read on David only suggests that it "might" be 1440x1080 through HDMI (blown up to 1920x1080). It is still unknown whether it is true 1920x1080 from the sensors to HDMI out. Personally I believe it's the latter.

DIGIC DV II processes the HD signal at 1440 x 1080 with 4:2:2 color sampling.

[Solomon Chase]

Kevin, could you email me? my email is sc "at" batteryfire.com. I need to get in contact with you and don't have your email address.

[Wayne Morellini]

I thought there was an link here to an thread on an external PCIE box for laptops, but I can't find it. Here is another, and hopefully much cheaper:

http://www.theinquirer.net/?article=41876

[Serge Victorovich]

Thank you, Wayne. Good find!

[Richard Leadbetter]

Originally Posted by Serge Victorovich

Thank you, Wayne. Good find!

The Advanced Dock that's compatible with a whole range of Core 2-powered IBM/Lenovo notebooks has a PCIe slot...