jerks in slow motion

lynj wrote on 12/30/2003, 9:21 PM

I'm getting intermitant jerks in rendered video. When I rerender it could be gone or in another section. It is not consistant. Any suggestions? This slo mo thing is so frustrating, because I use it a lot.

I am using settings recommended by a user in this forum that seem to work for slo mo alone most of the time: Event: Force resample (reduce interlace flicker NOT checked. Project properties: Best quality,Interpolate fields, Gaussian blur. Video Bus: Supersampling 3, Motion blur 2

Thanks,
Lyn

Comments

theigloo wrote on 12/31/2003, 2:28 AM

Are you using a velocity envelope? If so, your "disapearing act" could be explained by the fact that when you use a velocity envelope, the length of the event does not change. If you do slo mo, you'll need to expand the lenght of the event so that it spans the amount of time required to play the event. Just keep draggin the event edge until you see a little knick indicating it's at it's end. If you go past the knick, the media will just start from the begining again.

Another way to do slow mo is to hold ctrl down and drag the event edge. You'll see that your cusror becomes sawtoothed. That will take the entire event and slow it down (or speed it up if you shorten the evvent).

Stay away from velocity envelopes unless you need to take advantage of the fact that they allow you to continuously deccelerate or accelerate your footage. You'll find that the the ctrl+drag technique is much easier on the brain.

farss wrote on 12/31/2003, 4:42 AM

Also bear in mind there's a limit to how far you can go!
To slo mo video new frames have to be created, anything below 30% is really pushing it, there just isn't enough information for anything to reliably fill in the gaps. This is also another case of where you really want to be checking just what it really looks like on a decent monitor.

cyanide149 wrote on 12/31/2003, 7:08 AM

Is it "jerky" during playback on your computer, or off the actual DVD. If it's from a DVD, remember that some players can't handle the higher bitrate that "best" rendering. There's little discernable difference to most people between the two.

lynj wrote on 1/1/2004, 11:02 PM

I know the slo mo is not perfect like analog, but when I render, I should not have glitches, some in audio & video. I am now getting it in other footage that is not slo mo. I have been working on a 30 minute special interest video which is to go on sale in late January for several weeks. I am so frustrated because I can't get a decent render.

Would optimizing the drive make a difference? I am afraid to optimize my drive because I could lose my work if it screws up...I have plenty of experience in that! Why does everybody rave about perfect renders in Vegas? I've never gotten a perfect render on a project more than 3 minutes long. If there's help out there, please give it to me. The manual is very vague on settings, etc. Thanks.

Lyn

farss wrote on 1/1/2004, 11:14 PM

Fragmentation of the drive will have zero effect, the CPU is just working its way through the numbers. A badly fragmented drive isn't a good thing, it may make the render take a lot longer but will have no bearing on the final outcome.

Also no matter what the settings you shouldn't be getting dropouts in the audio. With a bit of work you CAN make the audio sound poor and the video as well BUT not have glitches!

But before any of us can help we desperately need more info.

How are you evaluating the render quality?
What format are you rendering to?

lynj wrote on 1/5/2004, 6:49 PM

Sorry for the delay in getting back. I have been working endlessly on this project and now have it finished to my satisfaction. That is except for rendering to MPEG2! I rendered all the slo mos using the suggested settings, then dropped the rendered files into the project. I rendered all my stills (which flickered) and dropped them in. I finally got an acceptable product. I'm not sure why or what I did right, but I'm happy till the problem comes up again. Sometimes I think this digital format still has a lot of bugs. Thanks for all the suggestions.

Lyn