This IS the Avid L2: Re: [Avid-L2] Avid & non-standard frame rates (problems)

Friday, April 3, 2015

Re: [Avid-L2] Avid & non-standard frame rates (problems)

Trying to work through this I also used Premiere and got this reply on Creative Cow re. the strange frame rate & workaround..

c/o HT Davis

You have fallen into the OIS trap.

This type of image stabilizer is on by default on some cameras and will either speed up the frame rate or slow it down to stabilize an image. If you are on a rig or tripod, turn this off and make damned sure you check that before shooting. After shooting, if you are experiencing frame rate problems, the missing frames will be marked and the frame rate change will be as well, but only in the bitstream, not in the header. SO.... ...You'll have to transcode to a useable format. Find the base frame rate for the cameras, looks like a 25p on the 24.03, and a 24p setting on the 23.xx (25 frames and 23.9x in media encoder). You should transcode them with "USE FRAME BLENDING" so that the frame rates are filled in. This will fix any problems with the videos themselves.

Next, you'll have to import those into premiere. I also advise you to right click the clip in project panel and Interpret the Footage to your sequence frame rate. This will flag it and play it as if at that frame rate, but conforming it to seconds instead of frames. WARNING: you may drop some frames (though not many, and usually not enough to degrade the quality unless in areas of high motion)

On Apr 3, 2015, at 6:16 PM, Paul Dougherty lists@postlit.com [Avid-L2] wrote:

I'm reposting because my original subject line was not as clear

I'm working with 720p h.264 web cam interviews shot in a mixed bag of non-standard frame rates. The first interview I took delivery on (coincidentally) was the standard 29.97. Edited that on MC 8.2 all was smooth.

When the other ones with non-standard rates arrived I thought it best to edit in software that can mirror the source file, so as to avoid any frame rate interpolation and artifacts. *

I started to work in Premiere CC and was surprised to encounter lip-sync issues (not evident in Avid), even with the 29.97 mov. Hoping that is was just a monitoring problem, I tried to export… same problem. Strange - but let me start by asking this...

* For this job and in general, are my instincts right to want to maintain native frame-rates since this is meant for computer playback only?

Thanks,

Paul

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