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flicker in rendered video

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Edward Walkerflicker in rendered video
by on Mar 4, 2010 at 4:18:03 pm

Hi,

I am trying to render a video in After Effects CS4 WIN. Every video I render turns up with flickering. The flickering is not constant, in fact it is limited to a later part in the video. The video is around 2 minutes long.

I have examined all of the source files for flickering and none exist. It is definitely something being produced in the encoding of the rendered file.

The purpose of the render is to combine the two swf files together with the audio and upload to youtube 1080p.

Here are the details of the composition and render.

The composition is made up of 3 layers:

swf animation
swf animation
wav file

Both swf animations were generated with Flash 8. They are 1080p (1920x1080) 25fps.
The wav file is 44100.

I am attempting to export flv h.264
1920x1080 25fps progressive
AAC+ V2, 128kbps, 44.1 Stereo
CBR 133.6 Mbps

Profile High
Level 5.1

Keyframe distance set to 4 (i also tested @ 1)

Any suggestions as to how I can eliminate this flicker?

Thanks in advance


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Dave LaRondeRe: flicker in rendered video
by on Mar 4, 2010 at 5:28:29 pm

When I think of the word "flicker", I think of this: an intermittent, sporadic change in illumination. You can flicker the lights. Movies can sometimes flicker.

So what do YOU mean when you use the word "flicker"? Detailed descriptions are good, because the only guy on the COW with the ability to read minds is on vacation.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Edward WalkerRe: flicker in rendered video
by on Mar 4, 2010 at 5:45:09 pm

Hi, thanks for the quick reply

In response, it looks as if at some point in the encoding, frames sporadically are rendered as solid white. Possibly the background colour of the composite showing through? Or the encoder is failing to generate content. I don't know.

You can see it here at around 00:41







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Illya LaneyRe: flicker in rendered video
by on Mar 5, 2010 at 4:17:26 am

Try changing the frame rate.

Motion Design, Color, Editing
Simulated Wood Grain Cabinet Inc.
Bunim-Murray Productions


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Edward WalkerRe: flicker in rendered video
by on Mar 5, 2010 at 5:49:26 am

To a framerate other than the native frame rate of the source files?

Wouldn't that further confuse the situation?


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Edward WalkerRe: flicker in rendered video
by on Mar 9, 2010 at 9:44:55 am

Hi,

As per Illya's recommendation I changed the frame rate to 30fps. The flicker remained. I then changed the keyframe distance to 15 and then even reduced the bitrate from 133 to 100.

The problem remains. Here's an example:







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