Latest post Tue, Aug 5 2014 3:41 PM by Nick Ridley. 0 replies.
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  • Tue, Aug 5 2014 3:41 PM

    • Nick Ridley
    • Not Ranked
    • Joined on Mon, Aug 4 2014
    • London
    • Posts 10
    • Points 110

    720x1152i raster dimension for 35:1 with AMT

    Hi

    I'm making 35:1 JFIF and have tried all sorts of combinations of input xml parameters, but whenever I load my AAF into a 25i PAL project the raster dimenstion comes up as 720x1152i. Is this something I should worry about?
    I'm presenting 720x592 YUV frames using an input XML of

    <?xml version="1.0" encoding="utf-16"?>
    <AmtMediaAttributes>
      <format>
        <mediaFormat>Uncompressed</mediaFormat>
        <signalStandard>SS_625_50_I</signalStandard>
        <dropFrame>kAVXFalse</dropFrame>
        <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_Progressive</bufferFieldOrder>
        <bufferLineOrientation>BLO_Top_Bot</bufferLineOrientation>
        <rasterGeometry>RGT_NativeCompressed</rasterGeometry>
        <isAlphaPresent>kAVXFalse</isAlphaPresent>
        <alignment>16</alignment>
        <isAlpha0Transparent>kAVXBool_Max</isAlpha0Transparent>
        <compressionType></compressionType>
      </format>
      <timecode>10:00:00:00</timecode>
      <bitRateMode>CONSTANT BIT RATE</bitRateMode>
      <framesPerSecond>25</framesPerSecond>
      <storedHeight>592</storedHeight>
      <storedWidth>720</storedWidth>
      <audioTracks>2</audioTracks>
      <audioBits>16</audioBits>
      <audioBitRate>48000</audioBitRate>
      <audioCompressionType>Avid::WAVE::Uncompressed</audioCompressionType>
      <extendedAttributes>
        <attribute1>This is an attribute (#1)</attribute1>
        <attribute2>This is another attribute (#2)</attribute2>
      </extendedAttributes>
    </AmtMediaAttributes>

    and an output XML:

    <?xml version="1.0" encoding="utf-16"?>
    <AmtMediaAttributes>
      <format>
        <mediaFormat>Compressed</mediaFormat>
        <signalStandard>SS_625_50_I</signalStandard>
        <dropFrame>kAVXTrue</dropFrame>
        <compressionType>Avid::JFIF::Meridien::35_1</compressionType>
      </format>
      <timecode>10:00:00:00</timecode>
      <bitRateMode>CONSTANT BIT RATE</bitRateMode>
      <framesPerSecond>25</framesPerSecond>
      <storedHeight>592</storedHeight>
      <storedWidth>720</storedWidth>
      <audioTracks>2</audioTracks>
      <audioBits>16</audioBits>
      <audioBitRate>48000</audioBitRate>
      <audioCompressionType>Avid::WAVE::Uncompressed</audioCompressionType>
      <extendedAttributes></extendedAttributes>
       <tapeName>TEST1454</tapeName>
    </AmtMediaAttributes>

    These XMLs are copied from the SDK directories and matched using the spreadsheet in the documentation folder.
    I'm a little confused as to why, in the input XML:

    we have SS_625_50_I and then BFO_Progressive - does that matter? Wouldn't SS_625_50_P be better?

    In UNC_SD_PAL_2A.XML the signal standard SS_625_50_I and BFO_Merged_F1_First is set but this time the frame size is 720x288. Why is that? Surely BFO_Merged_F1_First implies that a full frame is being presented?

    Why is <rasterGeometry>RGT_SignalStandard</rasterGeometry> set in the UNC_SD_PAL_2A.XML but in UNC_720_592_PAL_2A.XML <rasterGeometry>RGT_NativeCompressed</rasterGeometry> is used? The signal standard is the same, so what are the criteria for when to use one or the other?

    I'd love to know more about this, but the documentation doesn't seem to help here unless I'm missing something. The xsd is useful for syntax but there are very few comments to explain when anything should actually be set. The AMT_Overview pdf says 'For some formats, not all combinations of codec, raster and frame rate are supported. For more details on the supported codec, raster and frame rate combinations please see AMT Functions Reference Guide, Section 2'. Section 2 of that PDF doesn't seem to offer that information, unless I'm again missing something.

    Any answers gratefully received.

    Many thanks

    Nick

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