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Tutorial : BMD Intensity Huffyuv capture with virtualdub

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Anmol Mishra
Tutorial : BMD Intensity Huffyuv capture with virtualdub
on Mar 7, 2010 at 5:33:15 am

ATM this is a placeholder. I am going to fill this thread with details about capturing using Huffyuv and virtualdub.

I will use BMD Intensity - not the pro version, as it seems to work on various mini-itx systems without the required graphics cards.

The purpose is to have a portable battery powered lossless recording system for a film I am making..

Two threads are helpful..
1. http://forums.virtualdub.org/index.php?act=ST&f=6&t=18348

AND

2. http://forums.virtualdub.org/index.php?s=96dad7ba5cf71f5cc786f521ed861dc0&a...



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Anmol Mishra
Re: Tutorial : BMD Intensity Huffyuv capture with virtualdub
on Mar 7, 2010 at 5:34:58 am

I sent an inquiry to Dale who has this working, about colorspace issues..
Here is the email..

I was following your thread on virtualdub.org.
I had a few questions as there were some issues.
1. The build is a fork of virtualdub, and is only in the virtualdub-hdyc that squid_80 put out. Is that correct ?
2. The version in the thread is the non Multithreaded huffy build. Is that right too ?
3. Also, there were issues with the HDYC colorspace outputted by Huffy. The gent here did tests on a vectorscope and found some interesting things..Are you sure this is not occurring in the HDYC build you are using ??

http://www.etfinder.net/capturepics/

And the forum thread where this occurs..

http://forums.virtualdub.org/index.php?act=ST&f=6&t=18348

I do not have access to a vectorscope and my concern would be, that we are having small issues with colorspace using virtualdub and huffy that do not show up until the generated files are carefully observed..


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Dale Mullins
Re: Tutorial : BMD Intensity Huffyuv capture with virtualdub
on Mar 8, 2010 at 3:08:41 am

Hello Anmol.

I just responded to your post on the VirtulDub forums here:
http://forums.virtualdub.org/index.php?act=ST&f=6&t=16116&st=32

In summary, I do not notice any colorspace issues with my capture using the BlackMagic Intensity, VirtualDub and the Huffyuv compression. Details are in the link I posted above.

Good luck,
Dale


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Anmol Mishra
Re: Tutorial : BMD Intensity Huffyuv capture with virtualdub
on Mar 15, 2010 at 11:36:13 am

We did a test posted at vimeo

We played out a SMPTE color bar from a 5d Mark II. It was ingested with a BM Intensity card using Virtualdub. There were 2 files, a special Huffyuv build for HDYC and the default BM MJPEG. As you scroll through the video it can be seen that the colorspace changes when Huffyuv records. This is a confirmation of the problem first noticed at
etfinder.net/capturepics/


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Anmol Mishra
Re: Tutorial : BMD Intensity Huffyuv capture with virtualdub
on Mar 16, 2010 at 2:19:52 pm

On further tests I decided to include the AMV2-MT codec from here..
http://amamaman.hp.infoseek.co.jp/english/amv2_e.html

Its a lossless 8-bit 4:2:2 codec similar to Huffy.
It costs 10 bucks though.

I found it to be the best lossless capture option. It gives 2-4 times compression in realtime. It seems to be a variant of the AMV codec, which is a variant of MJPEG.

I will post a video that shows the colorspace issues with BM MJPEG, Huffy and AMV2-mt.
AMV2-mt is a faithful reproduction of the SMPTE color bars..


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