Latest post Mon, May 8 2017 4:46 PM by jef. 3 replies.
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  • Mon, May 8 2017 1:55 PM

    • Eric V
    • Not Ranked
    • Joined on Tue, Jun 23 2015
    • Posts 17
    • Points 195

    DNxHR and alpha in QuickTime

    Is alpha stored with DNxHR in QuickTime done the same way as for DNxHD?

    For DNxHD we expect the alpha to follow the rgb in one QuickTime chunk, and the rgb size to be stored in the last 4 bytes of the chunk. With the DNxHR files exported from MC, I don't see the rgb size in those last 4 bytes...

    Eric

  • Mon, May 8 2017 2:25 PM In reply to

    • jef
    • Top 50 Contributor
    • Joined on Sun, Feb 26 2006
    • Maryland
    • Posts 3,486
    • Points 42,040

    Re: DNxHR and alpha in QuickTime

    What tool are you using to create the DNxHR w Alpha?

    Avid DS 11.0.2 R.I.P | MC "Well, it depends ..." mostly 8.11.0 but playing w 2018.12.6|OS 10.14.x - iMac 2017 - home system MacPro Dual 2.8 8core... [view my complete system specs]

    _____________________________________________

    Jef Huey

    Senior Editor

    Old Stuff  http://vimeo.com/album/3037796

  • Mon, May 8 2017 3:00 PM In reply to

    • Eric V
    • Not Ranked
    • Joined on Tue, Jun 23 2015
    • Posts 17
    • Points 195

    Re: DNxHR and alpha in QuickTime

  • Mon, May 8 2017 4:46 PM In reply to

    • jef
    • Top 50 Contributor
    • Joined on Sun, Feb 26 2006
    • Maryland
    • Posts 3,486
    • Points 42,040

    Re: DNxHR and alpha in QuickTime

    As of now, it is not possible to export files with Alpha from Avid.  I believe that feature was shown as "Under Investigation" in a post by Marianna.

    EDIT:  There are some complicated workarounds for this if you are really in a bind.

    Jef

    Avid DS 11.0.2 R.I.P | MC "Well, it depends ..." mostly 8.11.0 but playing w 2018.12.6|OS 10.14.x - iMac 2017 - home system MacPro Dual 2.8 8core... [view my complete system specs]

    _____________________________________________

    Jef Huey

    Senior Editor

    Old Stuff  http://vimeo.com/album/3037796

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