Latest post Tue, Mar 20 2018 4:12 PM by Vadym. 3 replies.
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  • Mon, Mar 19 2018 5:34 PM

    • JamesTV
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    • Joined on Fri, Mar 31 2017
    • Posts 21
    • Points 275

    AMT wont create JFIF with Rec. 709 colour space

    Using our AMT integration, I am trying to get it to produce a JFIF with the colour space flagged as Rec. 709. This is because the source media was a HD asset, and although the JFIF is SD, of course the colour space needs to reference the HD standard.

    When we take a JFIF file created by Avid, it is correctly flagged as Rec. 709 when created from a HD source - but when I alter the XML to CS_YCbCr_709 from CS_YCbCr_601;

        <format>

            <mediaFormat>Uncompressed</mediaFormat>

            <signalStandard>SS_625_50_I</signalStandard>

            <colorSpace>CS_YCbCr_709</colorSpace>

            <colorComponentOrder>CCO_CbYCrY_NoA</colorComponentOrder>

            <chromaSubSampling>CSS_4220</chromaSubSampling>

            <resolution>RS_FULL</resolution>

            <componentDataFormat>CT_UCHAR</componentDataFormat>

            <crtRange>CRT_VideoRange</crtRange>

            <bufferFieldOrder>BFO_Merged_F1_First</bufferFieldOrder>

            <bufferLineOrientation>BLO_Top_Bot</bufferLineOrientation>

            <rasterGeometry>RGT_SignalStandard</rasterGeometry>

            <isAlphaPresent>kAVXFalse</isAlphaPresent>

            <alignment>16</alignment>

            <isAlpha0Transparent>kAVXBool_Max</isAlpha0Transparent>

        </format>

    The process errors. Any suggestions / reasons as to why? The source MXF contains uncompressed SD Rec. 709 video.

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  • Tue, Mar 20 2018 3:14 PM In reply to

    • Vadym
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    • Joined on Thu, Apr 17 2014
    • Posts 198
    • Points 2,455
    • Avid Developer Moderator
      Avid Employee

    Re: AMT wont create JFIF with Rec. 709 colour space

    Hi,

    Please ask production questions on the following forums http://community.avid.com/forums/353.aspx

    AMT XMLs' format tag has to be used as is and cannot be changed at will. The format quoted above is not for JFIF format.

    You may also want to try using the newest version of toolkit to generate your media.

    Thanks

  • Tue, Mar 20 2018 3:16 PM In reply to

    • JamesTV
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    • Joined on Fri, Mar 31 2017
    • Posts 21
    • Points 275

    Re: AMT wont create JFIF with Rec. 709 colour space

    Vadym,

    Thanks - will ensure I post there in future.

    I am confused by your comment regarding the format not being valid for JFIF - Avid Media Composer creates JFIF files with the Rec. 709 colour space - and so how can it not be valid?

    I believe I am using the latest AMT - but will double check this also.

  • Tue, Mar 20 2018 4:12 PM In reply to

    • Vadym
    • Not Ranked
    • Joined on Thu, Apr 17 2014
    • Posts 198
    • Points 2,455
    • Avid Developer Moderator
      Avid Employee

    Re: AMT wont create JFIF with Rec. 709 colour space

    The latest version is AMT3.

    The XML you're quoting above belongs to some kind of RAW media format. AMT2 XMLs have no JFIF samples for the 709 color space, you'd have to use GetAmtFileSpecification first to obtain it from the MediaComposer generated OpAtoms.

    Thanks

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