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Is This Converting

Posted: Sat, 5th Mar 2011, 8:04pm

Post 1 of 4

Darth Stazz the Powerful

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From what I understand, 23.976 fps is NTSC and 24 fps is PAL. OK great, but here's where my issue lies. I had the pleasure of receiving my new Canon Rebel T2i in the mail earlier this week and just tested out it's HD filming. Importing it into Visionlab, the framerate was automatically calculated to 23.98 (So I suppose Visionlab is rounding up). When viewing the exported film from Visionlab, the video was in very slight slow motion. However, in the project setting, I set the framerate to 24 and the exported film was then correct.

The point of that long introduction.. am I obstructing the framerate data by rendering out in 24 fps from footage that is originally 23.976 fps, even though rendering out in 24 fps actually corrects the original problem?
Posted: Sun, 6th Mar 2011, 8:13am

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Axeman

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PAL is 25 fps, not 24. 24 fps is a film standard.

Was the 23.98 video noticeably slower when you watched it, or did you realize it was slightly slower when you tried to sync the audio or something? At .02 of a frame difference per second, it would take about 2 full seconds for the footage to get even one frame off from where it should be, which is not going to be noticeable to the eye during playback. Basically, a full minute would play back in 59 seconds, instead of 60. If you are actually seeing a noticeable slow-down, then something else must be going on as well.

As far as changing the framerate to correct the problem. I think it would be worthwhile determining why the footage plays back incorrectly to begin with. Are you sure that when you exported the footage from your video editor the framerate didn't get changed there, by a preset or something?
Posted: Sun, 6th Mar 2011, 7:30pm

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Darth Stazz the Powerful

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I knew that the video was slowed because of the audio. After discovering that the audio is off, i did notice a slight change in speed within the picture itself.

The footage was put straight into Visionlab after being imported from my camera. So it wasn't altered by any other program before hand.
Posted: Mon, 7th Mar 2011, 6:39am

Post 4 of 4

Darth Stazz the Powerful

Force: 2040 | Joined: 3rd Dec 2005 | Posts: 201

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I suppose it's not too large of a deal and I will just set it to 24 fps since I achieve better results from that