Latest post Thu, Jun 22 2006 9:52 PM by Kevin Klimek. 8 replies.
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  • Fri, Jun 16 2006 6:33 PM

    • FMPedit1
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    Clamped video on imported files

    Here is my problem,

    When I export video from my XP Adrenaline 2.2.3 with 6.5.2 Quicktime and then re-import that same file to campare with the original video footage I loaded into the Avid, I see, both on the screen and the video scope, a clamping of the video in the highlights.  It's about 5 IRE.  This happens with .mov(same a source) .mov(custom) and AVI.

    Has this happed to anyone? 

    Thanks

    Ed

    HPxw8600 Workstation, Windows7 Professional SP1, Intel Xeon CPU, X5450 @ 3.00GHz (2 processors), 12 GB of installed RAM,64-bit OS, NVDIA Quadro FX 3700... [view my complete system specs]
  • Fri, Jun 16 2006 7:18 PM In reply to

    Re: Clamped video on imported files

    are you exporting RGB or 601?  are you importing RGB or 601?  whatever you use you have to use for both. I would suggest 601 as it doesn't effect the video on import. RBG import will clamp the video down. 


    basically 601 levels are from 16-235 on the RGB scale. RGB runs from 0-255. so when you import something that is made with RGB levels, and tell the avid to import with RGB levels, then it squashes the levels down to 16-235.  But if you have something that is 601 (16-235) and then import with RGB setting, then it gets squashed down to about 32-205 or so.




    Follow me at www.twitter.com/redarrowryan Avid 1- z400 6-Core, with Nitris DX Symphony 6.0.3 Win 7 64 Bit [view my complete system specs]
  • Fri, Jun 16 2006 8:04 PM In reply to

    Re: Clamped video on imported files

    You will especially notice the difference Mr. Difficult describes when you import color bars at first RGB, then 601 (the correct choice) and compare the two.
    Newscutter Nitris DX 9.5.3.5 * Media Composer 5.5.3.6 (At Home on PC running XP Pro) * Symphony 6.5.2.1 (At home on MacBook Pro3,1 running 10.7.2) * Interplay... [view my complete system specs]

    Larry Rubin

    Senior Editor

    The Pentagon Channel

    www.pentagonchannel.mil

  • Fri, Jun 16 2006 8:10 PM In reply to

    • FMPedit1
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    Re: Clamped video on imported files

    I am capturing into MC 1:1 RGB and exporting as RGB.  The clamping is only on the highest video level in the frame.  If the scope shows the highlights at 85 IRE on the original media, the imported file will show just the areas of the frame that are in the 85 IRE space clamped to about 80 IRE.  Everything else is unchanged.

     

    HPxw8600 Workstation, Windows7 Professional SP1, Intel Xeon CPU, X5450 @ 3.00GHz (2 processors), 12 GB of installed RAM,64-bit OS, NVDIA Quadro FX 3700... [view my complete system specs]
  • Fri, Jun 16 2006 8:19 PM In reply to

    Re: Clamped video on imported files

    Ok, you say you're capturing into MC, not importing so that means your captured material is at 601 (video) color levels, not RGB (graphics) color levels.  Have you tried exporting at 601 levels? If not, do so and then compare.
    Newscutter Nitris DX 9.5.3.5 * Media Composer 5.5.3.6 (At Home on PC running XP Pro) * Symphony 6.5.2.1 (At home on MacBook Pro3,1 running 10.7.2) * Interplay... [view my complete system specs]

    Larry Rubin

    Senior Editor

    The Pentagon Channel

    www.pentagonchannel.mil

  • Mon, Jun 19 2006 1:06 PM In reply to

    • FMPedit1
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    Re: Clamped video on imported files

    Yes, I am Capturing at 601.  I did an export at 601, with no luck.

     

    HPxw8600 Workstation, Windows7 Professional SP1, Intel Xeon CPU, X5450 @ 3.00GHz (2 processors), 12 GB of installed RAM,64-bit OS, NVDIA Quadro FX 3700... [view my complete system specs]
  • Wed, Jun 21 2006 8:49 AM In reply to

    Re: Clamped video on imported files

    Are you exporting Avid Same as source? Or are you using another codec?

    We have found issues with Animation QTs not translating their color levels properly, but Avid QTs have been OK.

    Symphony v8.8 | OS 10.11.6 • Nitris DX • 12-core MacPro (Mid 2012) • 36 GB RAM • Facilis Terrablock 24EX [view my complete system specs]

    -- Kevin

  • Thu, Jun 22 2006 1:29 PM In reply to

    • FMPedit1
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    Re: Clamped video on imported files

    Hi Kevin,

    Yes, I did the same as source, QT reference and an uncompressed .mov and we get the same clamping on the highlights.  We are using the animation codec on the .mov files, so I'll try another setting.

    HPxw8600 Workstation, Windows7 Professional SP1, Intel Xeon CPU, X5450 @ 3.00GHz (2 processors), 12 GB of installed RAM,64-bit OS, NVDIA Quadro FX 3700... [view my complete system specs]
  • Thu, Jun 22 2006 9:52 PM In reply to

    Re: Clamped video on imported files

    Is you original video level legal?

    When you say its clamping 5 IRE, it's going from what IRE to what IRE?
    Symphony v8.8 | OS 10.11.6 • Nitris DX • 12-core MacPro (Mid 2012) • 36 GB RAM • Facilis Terrablock 24EX [view my complete system specs]

    -- Kevin

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