• Blackmagic Design

  AE6.5 to 10bituncompressed codec/FCP5

  Posted by Felix Mack on July 21, 2005 at 7:31 pm

  Hi –

  I’d really appreciate it if you could try this quick test:

  1. In AE, make a 720×486 comp, create a solid, and apply the ramp filter. Make the ramp go from black on the left to white on the right.
  2. Render this comp in the Uncompressed 10bit codec (the apple FCP ones, not Black Magic or other).
  3. Import the clip you just made, drop it into the same comp, and render the clip again with the same settings.
  4. Import both quicktimes into FCP, make a Uncompressed 10bit Sequence, drop the clips on the time line and look at the scope.

  And here are the questions:
  1. When you look at the original clip, does the waveform monitor show a perfectly straight line, or is it curved?
  2. When you look at the rerendered clip, does the waveform monitor look the same as the previous clip?

  That’s all. I am noticing rendering to the 10bit codec seems to make everything brighter via a gamma boost.

  Thanks.

  Accountneedsrealnameupdate replied 20 years, 9 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Chris Tomberlin

  July 21, 2005 at 11:01 pm

  Felix,

  I’m seeing some related problems with uncompressed 10-bit codecs. Can you tell me whether or not you are working in 8 or 16 bits in AE? When you render, are you rendering to millions of colors or trillions of colors?

  Thanks
  Chris Tomberlin
  OutPost Pictures
• 

  Felix Mack

  July 21, 2005 at 11:26 pm

  i have tried both 8 and 16bits when going to 10bit uncompressed, and the results have been the same for me. I think there’s something whack with the rgb to yuv conversion with the apple codecs. All other codecs seem to work fine for me.

  https://www.kenstone.net/fcp_homepage/video_levels_nattress.html

  If you check here in the article, towards the end he mentions that FCP adds a gamma increase to all still brought in. He says to fix it you have to apply a 0.8 gamma setting with the levels filter in PS. I have tried doing the same in AE with the levels filter, and it does indeed compensate for the FCP gamma increase to fix it.

  https://www.highend2d.com/boards/showflat.php?Cat=1,6,7,8,9&Board=shakeforum&Number=192693&page=20&view=collapsed&sb=5&o=&fpart=

  I think people are having a lot of issues with this. . .

  https://docs.info.apple.com/article.html?artnum=93794

  The above is also interesting to read. Maybe there are some clues in there. Why can’t we just have a preference to turn off ‘gamma assumptions’?

  Cheers,
  Felix
• 

  Accountneedsrealnameupdate

  July 29, 2005 at 1:49 am

  We’ve had all kinds of problems with the apple codecs in the past, I was hoping that the version in FCP5 was fixed but judging from you guys it isn’t and I’m dreading having to switch when we upgrade the systems.
  This is really serious, we produce DVD menus and I’d rather stick with FCPHD than deal with Gamma corrections to our stuff. Why can’t we stick with the blackmagic codec?
  Glenn Stewart
  1k studios

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