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  • Blackmagic Design

    Blackmagic and PhotoJpeg luma shifts…Anyone?

    Posted by Mike J. on January 13, 2006 at 2:43 am

    Just curious….the AUDIO VIDEO settings for AV OUTPUT of final cut with the newer Blackmagic Drivers doesn’t have PhotoJpeg as a choice anymore.

    When I choose 8bit…it does play out but then gets excessive brighter when you pause playback…hit play…normal…..pause..brighter.

    What’s the proper playback setting now for Photo Jpeg

    Thanks

    Mike

    Kristian Lam replied 20 years, 1 month ago 8 Members · 16 Replies
  • 16 Replies

  • Kristian Lam

    January 13, 2006 at 4:30 am

    Hi Mike,

    Can you let us know what version of

    1) DeckLink drivers
    2) Final Cut Pro
    3) Quicktime
    4) OS X

    As well as the

    1) format of video you’re playing. SD / HD?
    2) Model of DeckLink card
    3) Type of Mac

    Thanks

    regards

    Kristian
    Blackmagic Design

  • Sean Oneil

    January 13, 2006 at 4:37 am

    I have the same issue but I only see it on unrendered effects.

    Sean

  • Kristian Lam

    January 13, 2006 at 6:34 am

    Hi Sean,

    Does this show up both on the output of the card and in FCP’s canvas window?

    regards

    Kristian
    Blackmagic Design

  • Mike J.

    January 13, 2006 at 4:47 pm

    Sorry…

    Final Cut 5.03_ Decklink 4.8 Drivers ….Photo Jpeg 720×486 OS X TIGER (latest minus the Macworld update) on a G5 1.8 DUAL PCI-X tower.

    it’s a DECKLINK PRO card as well.

    The footage was captured on an old KONA 1 card with blackmagic drivers over a year ago at another shop. I just bought the DECKLINK PRO for home studio and noticed there was no PHOTO JPEG OUTPUT SETTING anymore.

    Mike

  • John Christie

    January 13, 2006 at 7:16 pm

    Mike

    Have you tried turning off overlays on your Canvas window?

    Cheers

    John Christie

    Keyframes Editing

  • Mike J.

    January 14, 2006 at 1:05 am

    Yeah..they’re off

  • Mactrix

    January 15, 2006 at 11:46 am

    The luma/chroma-shifting is a huge problem that occurs with BMD-cards
    since a while. Yet in 2004 I had that problem – not with FCP (4.5) but in
    After Effects and only inside a 16-Bit project using 10-Bit footage. When
    rending out in 10-Bit again there was a luma/chroma-shifting. The image
    was much more brighter and also the saturation of colors changed.

    Since a while the problem occurs in FCP.

    First scenario: 10-Bit BMD sequence, only in rendered files.
    Solution: Turn off HDR-Rendering (high-precision YUV) in FCP and use
    8-Bit YUV-Rendering instead.

    Second scenario: Other codecs are effected (like DV, DVCPRO HD).
    Solution: Kick off the BMD QuickTime codec-component out of the Library
    folder.
    Alt-Solution: Try to change White and Super-White-Settings for your
    sequence.

    There is also still a problem when working in After Effects with BMD
    10-Bit footage in 16-Bit project. The picture gets vertical lines and
    the colors are totally wrong (like red becomes violett). Change the
    project-settings to 8-Bit than. You can also move the BMD-component
    out of the QuickTime folder and use AJA HD-codec component instead
    inside a 16-Bit project. But you will still have a chroma/luma-shifts
    when rendering out to other codecs than the original one (like Microcosm
    when you want to preserve an alpha-channel).

    If you work only in SD try to not use BMD-codecs. Move them out of the
    QuickTime folder in the System Library. Use only Apples uncompressed
    codecs instead. For HD there is no solution because the Apple codecs are
    not for HD.

    It seems that with AJA cards and AJA-codecs (for HD) this problem does
    not occur. If using AJA but with installed BMD-codecs (QuickTime component)
    the problem occurs also with AJA.

    Difficult to say at his point if it’s a BMD or Apple/QuickTime/FCP-Bug. It has
    something to do with Gamma-Settings and there are reports that QuickTime
    changes Gamma-values in general … but for what reasons?

  • Mark Cookman

    January 21, 2006 at 8:56 pm

    photo jpeg problem: you may need to have “render in rgb” checked in your timeline settings.

  • Mactrix

    January 24, 2006 at 11:01 am

    But Photo-JPEG with exactly 75% quality is YUV 4:2:2, not RGB.
    0-74 and 76-100% is RGB.

  • Kristian Lam

    January 24, 2006 at 12:10 pm

    Hi mactrix,

    When you metioned rendering with the BMD codecs, do you refer to the stand alone codecs or the ones installed by our drivers?

    [mactrix] “There is also still a problem when working in After Effects with BMD
    10-Bit footage in 16-Bit project. The picture gets vertical lines and
    the colors are totally wrong (like red becomes violett).”

    We believe this has been resolved. However, could you please contact us at support[at]blackmagic-design.com?

    [mactrix] “For HD there is no solution because the Apple codecs are
    not for HD.”

    In FCP 5, Apple’s Uncompressed 4:2:2 codecs have HD colourspace and that’s what we’ve been using as well in our default capture setups.

    regards

    Kristian
    Blackmagic Design

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