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speed change makes footage darker?

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Louise Macaulay
speed change makes footage darker?
on Oct 19, 2011 at 4:37:28 pm

I'm working with Apple Pro Res 422 files. In a 2 min 46 sec piece I've changed the speed on about 3 seconds of footage that's in the middle of a single, contiguous ~10 second clip. The 3 seconds in the middle is 94% of the speed of the footage before and after it. In the export (keeping current settings), that 3 seconds is darker than the rest of the piece. During playback in FCP, anywhere in the timeline, I see it switch between dark and light every time I hit play or stop... but if I let it play through that 3 seconds it looks fine.

I've tried rendering with "frame blending for speed" both checked and unchecked with the same results. Any help would be appreciated!


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Rafael Amador
Re: speed change makes footage darker?
on Oct 19, 2011 at 5:11:40 pm

Do you have your sequence set to "render in High precision"?
rafael

http://www.nagavideo.com


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Louise Macaulay
Re: speed change makes footage darker?
on Oct 19, 2011 at 8:31:25 pm

I just set it to high precision and best quality and re-rendered with the exact same results - I also realized that the fade to black at the end actually flips to being darker at the beginning of the transition as well, so it isn't just speed, it's any effect??

I think I read somewhere here about using color correction - is that my only option?

Thanks again!


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Christopher McDonell
Re: speed change makes footage darker?
on Oct 20, 2011 at 5:29:17 am

This sounds very strange. Your composite mode is 'Normal', right? You're opacity is 100 throughout, right? If you copy this clip into a new timeline, do you get the same results? Is it fully rendered, not showing any color bars?


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Louise Macaulay
Re: speed change makes footage darker?
on Oct 20, 2011 at 3:21:24 pm

Really? In searching the forums it seems I'm not the only one who has experienced this, in fact it almost seems expected in some respects:

http://forums.creativecow.net/readpost/8/985420
http://forums.creativecow.net/readpost/8/1107446

So far nobody has had a really concrete explanation or solution, which is why I thought I'd ask again.

My composite mode is indeed normal, my opacity is 100% throughout, and it is fully rendered. I am going to test today the idea of putting the original file into a brand new timeline/new project and changing the speed on a portion of it and seeing how it exports. Any other suggestions are most welcome!


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Rafael Amador
Re: speed change makes footage darker?
on Oct 21, 2011 at 5:25:22 am

Which FC and QT versions are you using?
That smells to FC.6.
rafael

http://www.nagavideo.com


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Louise Macaulay
Re: speed change makes footage darker?
on Oct 21, 2011 at 8:10:38 pm

I'm using FCP 7.0.3 and QT Player 7.6.6.

I just tried a test:

- Using Compressor, I converted my original 640x480 AVI file to Apple Pro Res 422

- Started a new project in FCP, imported the Pro Res 422 mov file and put it in the sequence, said "yes" to changing the sequence settings to the clip settings

- Changed the Easy Setup to uncompressed 8bit NTSC 48kHz (I tried Aja Kona LHi NTSC Apple ProRes 422 and the footage wouldn't play in the canvas or viewer)

- Checked the sequence settings - general was NTSC Apple ProRes 422, video processing is "Render all YUV material in high-precision-YUV", render control both filters and frame blending are checked and quality is "best."

- Slowed the speed on the middle of the video to 95%

- Exported with current settings

I still get the same darkening during the slowdown:

http://www.mediafire.com/?jlk9iqwe9h41c3l

This is a 19MB file, only 5 seconds long, the darkening is obvious from 01:29 to 04:11.

Thanks for your time...


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David Roth Weiss
Re: speed change makes footage darker?
on Oct 21, 2011 at 8:20:56 pm

It looks to me as if you shot this with autoexposure turned on, but in any case it's very difficult to tell without seeing a before and after.

David Roth Weiss
Director/Editor/Colorist
David Weiss Productions, Inc.
Los Angeles
http://www.drwfilms.com

Don't miss my new Creative Cow Podcast: Bringing "The Whale" to the Big Screen:
http://library.creativecow.net/weiss_roth_david/Podcast-Series-2-MikeParfit...

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™


Creative COW contributing editor and a forum host of the Business & Marketing and Apple Final Cut Pro forums.


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Louise Macaulay
Re: speed change makes footage darker?
on Oct 21, 2011 at 8:30:44 pm

Here's a link to the directory containing original AVI file, the converted ProRes 422, and the test file with the speed change. Thanks for looking, I do appreciate it.

http://www.mediafire.com/?tu67qd5p5qcqx


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David Roth Weiss
Re: speed change makes footage darker?
on Oct 21, 2011 at 8:43:30 pm

I really don't see a shift that's not in the original. It appears to me that the camera was in auto-exposure as I previously mentioned, and it irises down slightly as you get closer to the wall and the guitar.

I could be all wrong, but that's what it looks like to my eye.

David Roth Weiss
Director/Editor/Colorist
David Weiss Productions, Inc.
Los Angeles
http://www.drwfilms.com

Don't miss my new Creative Cow Podcast: Bringing "The Whale" to the Big Screen:
http://library.creativecow.net/weiss_roth_david/Podcast-Series-2-MikeParfit...

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™


Creative COW contributing editor and a forum host of the Business & Marketing and Apple Final Cut Pro forums.


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