Latest post Tue, Dec 31 2013 7:04 PM by Dino Eyeball. 8 replies.
Page 1 of 1 (9 items)
Sort Posts: Previous Next
  • Tue, Mar 5 2013 12:22 AM

    • Robert
    • Not Ranked
    • Joined on Tue, Mar 5 2013
    • SC, USA
    • Posts 3
    • Points 25

    AVID DNxHD CODEC artifacts

    I have just begun using the Avid DNxHD CODEC upon the recommendation of a friend within After Effects and Premiere CS6.  When exporting from After Effects, a 10bit 23.976fps 1080p file looks great.  When loaded into premiere, it looks great, however, when rendered out of premiere into another file (using the same CODEC or another), there are problems.  The resulting file is useless as a miriad of artifacts are created in the bright areas of the frame.  What is going on, and how can I correct this?  Thank you for the help.

     

    Comparison

    Windows 7 Pro Intel i7 2600k 3.4GHz 16GB RAM [view my complete system specs]
  • Tue, Mar 5 2013 12:50 AM In reply to

    • jwrl
    • Top 25 Contributor
    • Joined on Thu, Oct 13 2005
    • Melbourne, Australia
    • Posts 8,420
    • Points 97,425

    Re: AVID DNxHD CODEC artifacts

    Not really help, more of a comment.  I routinely bounce work between Avid MC 5.5 and AE CS5 using DNxHD 185X and don't see problems like that.

    However, I also have a Matrox Mini on that system.  Its initial drivers seriously impaired AE.  I could only work with 8-bit color depth.  16-bit or higher gave a weird fractal-like break up of the image.  Is it possible that you have a similar issue?

    In my case a Matrox driver update was the only fix necessary.

    MC 7.0.4 - Asus P6T Deluxe V2 mobo - Intel i7 920 2.66GHz - Windows 7 Ult64 SP1 - nVidia Quadro FX 1800 - 16 Gbyte low latency DDR3 RAM - Internal 8 Tb... [view my complete system specs]
  • Tue, Mar 5 2013 7:24 AM In reply to

    Re: AVID DNxHD CODEC artifacts

    The artifacts are a known problem with the DNxHD 10 bit codec.

    They occur when a 422 file with high luminance has colour, which when matrixed to 444 exceeds the RGB values gamut.

    (422 colourspace exceeds 444 colourspace unless the signal is 709 legal)

    Try another codec by transcoding to say DNxHD 444 and exporting same as source.

    BTW, You are using the "709" tab for export and re-import? Re-mapping the levels will make matters worse.

    Do not change codecs on import or export or your files will be converted to 8 bit by invoking the quicktime engine.

    Here is an earlier heated discussion...

    http://community.avid.com/forums/t/111343.aspx?PageIndex=2

    Symphony 7.06 OS 10.9.5 QT 7.6.3 Mac Pro 2x2.66 6-core 32GB Ram Aja Kona Lhi. MC 7.0.6 OS 10.9.5 Mac Pro 5.1 2x2.97 6-core 32GB ram Aja I/O express, Apple... [view my complete system specs]
  • Tue, Mar 5 2013 6:41 PM In reply to

    • Robert
    • Not Ranked
    • Joined on Tue, Mar 5 2013
    • SC, USA
    • Posts 3
    • Points 25

    Re: AVID DNxHD CODEC artifacts

    Thank you for the thought.  I'm not using any hardware other than a nVidia video card and ASUS motherboard... both have the latest updates.

    Windows 7 Pro Intel i7 2600k 3.4GHz 16GB RAM [view my complete system specs]
  • Tue, Mar 5 2013 6:45 PM In reply to

    • Robert
    • Not Ranked
    • Joined on Tue, Mar 5 2013
    • SC, USA
    • Posts 3
    • Points 25

    Re: AVID DNxHD CODEC artifacts

    Thank you, David.

    I tried a fast color correction of the problematic footage - it seemed to work just fine.  I concentrated on the white levels, not the black.  Black seems to render perfectly no matter how far below 7.5 ire it goes, and thw white, I just adjusted to a max of 100.

    Also, I used the 709 on export, and I am not presented with an option on import.  Upon recompression, I choose either the same CODEC options or a different CODEC based upon application.

    Windows 7 Pro Intel i7 2600k 3.4GHz 16GB RAM [view my complete system specs]
  • Tue, Mar 5 2013 10:38 PM In reply to

    • jwrl
    • Top 25 Contributor
    • Joined on Thu, Oct 13 2005
    • Melbourne, Australia
    • Posts 8,420
    • Points 97,425

    Re: AVID DNxHD CODEC artifacts

    David Yardley:
    The artifacts are a known problem with the DNxHD 10 bit codec.

    They occur when a 422 file with high luminance has colour, which when matrixed to 444 exceeds the RGB values gamut.

    Great bit of information to have stored away.  Thanks, David.

    MC 7.0.4 - Asus P6T Deluxe V2 mobo - Intel i7 920 2.66GHz - Windows 7 Ult64 SP1 - nVidia Quadro FX 1800 - 16 Gbyte low latency DDR3 RAM - Internal 8 Tb... [view my complete system specs]
  • Tue, Mar 5 2013 11:04 PM In reply to

    Re: AVID DNxHD CODEC artifacts

    John,

    Psst. Perhaps I sound a bit too sure of myself; It's just a conjecture...

     

    Symphony 7.06 OS 10.9.5 QT 7.6.3 Mac Pro 2x2.66 6-core 32GB Ram Aja Kona Lhi. MC 7.0.6 OS 10.9.5 Mac Pro 5.1 2x2.97 6-core 32GB ram Aja I/O express, Apple... [view my complete system specs]
  • Wed, Mar 6 2013 11:02 PM In reply to

    • jwrl
    • Top 25 Contributor
    • Joined on Thu, Oct 13 2005
    • Melbourne, Australia
    • Posts 8,420
    • Points 97,425

    Re: AVID DNxHD CODEC artifacts

    ...still good to know that there is a history.

    MC 7.0.4 - Asus P6T Deluxe V2 mobo - Intel i7 920 2.66GHz - Windows 7 Ult64 SP1 - nVidia Quadro FX 1800 - 16 Gbyte low latency DDR3 RAM - Internal 8 Tb... [view my complete system specs]
  • Tue, Dec 31 2013 7:04 PM In reply to

    Re: AVID DNxHD CODEC artifacts

    Will this issue ever be resolved?  Any updates or fixes on this?  It looks like the Avid codecs are in a terrible state and never a peep from Avid themselves.  I've been waiting for years to make the switch back to Avid but every time I take a serious look, I find something else that just brings it all to a stop.  This codec business is probably the worst of it.  Help.

Page 1 of 1 (9 items)

© Copyright 2011 Avid Technology, Inc.  Terms of Use |  Privacy Policy |  Site Map |  Find a Reseller