• AJA Video Systems

  Workflow opinions solicited

  Posted by Jerry Witt on January 31, 2006 at 1:58 am

  I hope people with Kona cards and experience with HD can give me their opinions on this.

  I directed a feature-length movie a few years ago. Although we shot 60i mini-DV, the intent was always to combine multiple angles into a big 24P HD canvas. While assembling the movie I rendered a 24P 1920 by 1080 QuickTime movie to the Photo JPEG codec. This was rendered at precisely 24 frames per second (not 23.98). An SD version was also rendered and that is what I’ve been using to fine-tune the cut, sweeten the audio and compose music. Now I’d like to conform my HD renders to the SD cut. My questions are as follows:

  1.) Can I use my Kona 2 card to play back 24 frame per second video and display it on my consumer HD CRT monitor?

  2.) I see the Kona 2 supports JPEG compressed QuickTime. What would be a better codec choice, PhotoJPEG or DVCPro HD?

  3.) If I intend to master back to either D5 and /or HD Cam, will my frame rate be a problem? Doesn’t the HD spec support 24 AND 23.98 frames per second?

  As an aside, I’ve done some experimentation on #1 above. It seems that I can create a 1920 by 1080, 24 frame per second QuickTime movie that uses the DVCPro HD codec. If I put it in a 29.97 FCP timeline, it will play back through the Kona to the HD monitor (without rendering). If I try and put it into a 24 frame per second timeline it will display still frames, but will not play back full motion. Hmmmmm… Why?

  Any opinions or feedback would be greatly appreciated.

  Jerry Witt replied 20 years, 3 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Bob Zelin

  January 31, 2006 at 2:43 am

  you can’t see the 24p playback, because you are asking your monitor to have a scan rate of 48Hz, as opposed to 60Hz, and most monitors can’t playback a signal with a 48Hz scan rate (one exception to this is the Sony SDM-P234b 23″ monitor). If you allow for a conversion to a normal video frame rate, you can play it back in most monitors.

  Bob Zelin
• 

  Jerry Witt

  January 31, 2006 at 3:23 am

  So is it possible to set the frame buffer of the Kona to accept 24P and output 29.97? If so, how? Am I doing it right when I nest 24P material in a 29.97 FCP timeline?

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