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Activity Forums Blackmagic Design Tutorial : BMD Intensity Huffyuv capture with virtualdub

  • Anmol Mishra

    March 7, 2010 at 5:34 am

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

    I was following your thread on
    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 ??

    And the forum thread where this occurs..

    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..

  • Dale Mullins

    March 8, 2010 at 3:08 am

    Hello Anmol.

    I just responded to your post on the VirtulDub forums here:

    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,

  • Anmol Mishra

    March 15, 2010 at 11:36 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

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  • Anmol Mishra

    March 16, 2010 at 2:19 pm

    On further tests I decided to include the AMV2-MT codec from here..

    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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