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Old 06-25-2009, 08:05 PM   #1
SonicNinja
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Default ADVC 110 24FPS frame hold in Pro-Tools

Hi everyone,
Im currently new to the canopus and am having problems with the video output from Pro-Tools HD 7.3.1. I have received a 24FPS video file with burnt in time code which I have imported into Pro-Tools.

The video imports and runs successfully and the time code value for the BITC matches the time code in Pro-Tools (the pro tools session is likewise set to 24FPS). However, when i run the video through the canopus it displays the video with what looks like a lagging frame or holding frame every second or so. It is particulary noticable when a long sweeping shot is playing on the video.

The switches on the bottom seem to be set correctly with the first one set to PAL as it should be for this picture.

Hopefully someone has come across this and can help, I hope to hear from you soon.

Oh, and the picture plays fine through quicktime and when outputted directly through Pro-Tools to my TFT monitor.

Thanks

Keith
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Old 06-25-2009, 08:52 PM   #2
GrassValley_BH
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The ADVC only supports DV streams, so it'll depend on how the original 24 fps video is being converted to DV (which is natively 29.97 or 25 fps)
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Old 06-25-2009, 08:59 PM   #3
SonicNinja
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The quicktime .mov is DV PAL. Could you explain to me about the 29.97 and 25, do you mean that the 110 wont support 24 FPS.
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Old 06-25-2009, 10:34 PM   #4
GrassValley_BH
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Much like how DVD MPEG-2 is, DV is natively either 29.97 fps for NTSC or 25 fps for PAL.

Technically 59.94i or 50i as it's interlaced.

Regardless, 24 fps (or 24p or 23.976p) is represented in 59.94i using a 3-2 pulldown where fields are repeated at a set pattern (cadence).

In your case, since the QuickTime MOV is DV PAL, it's really 25 fps. I'm not entirely sure how it's storing 24 fps, but if it's playing back at normal rate, every second there's an extra frame that needs to be addressed for proper 25 fps playback.

Hollywood authors DVDs in PAL by letting the 24 fps film play at 25 fps. This results in the movie being slightly shorter in length and higher in pitch. It annoys purists, especially for musical performances.

http://en.wikipedia.org/wiki/24p
http://www.moviola.com/pulldown

Blu-ray supports 24p natively, so none of this trickery is needed there.
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