Jittery Video after rendering to an AVI file.

ruckusmccoy wrote on 3/10/2003, 12:37 PM
After completing a 90 minute film, I noticed that after 30 minutes of watching the rendered film on the computer or through the DV camera, there was a large amount of jitter for the rest of the film. It almost looked like the 29 frame film was dropped down to 18 frames. Very choppy and hard to watch.

I took a look at some previous suggestions of matching up the field order, which is currently at lower field first. I also tried to render the file to a mpeg 2 which did help the jitter , but not completely. My best theory is that my system resources are being maxed out and maybe the rendering is not going so smoothly. My current setup is :

P4 1.6a
512 PC800 Ram
20g drive (VV3 is installed here) only 2g's free
80g drive (Video/audio storage) only 20g's free (rendered avi comes out to about 18g)

I know I need more space so I should be getting a dvd burner by the end of the week. The rendering process takes about 4 hours long and I've tried to re-rendering, hoping it will fix itself, 4 times in the last two days. My foot is about to go through this computer. I though maybe it could be some corrupt vegas video files so I ran a repair on the program. No luck.

I completed a one hour film in May and had this problem but it turned out that the raw footage already had the problem. This time around the raw footage looks fine.

I read a post that this may happen when a video clip is corrupted but I don't want to redo 60 minutes of a 90 minute film. If anyone knows what's going on or has some suggestions that would be great.

Thanks for your time,
Adrian

Comments

Tyler.Durden wrote on 3/10/2003, 5:40 PM
Hi Adrian,

Have you printed the file to tape and still have the issue?


Can you take the rendered file into a new Vegas project and see the issue while stepping through the footage? If not, it may just be a playback issue, not the file.

Have you viewed the file in the "preview to device" mode of Vegas-Capture> Print to tape?


What will be the final format of the movie?


mph

jmpatrick wrote on 3/10/2003, 8:24 PM
Funny, this same thing happened to me this evening with V4. I had 2 camera angles on the time line. When I rendered, one of the cameras was jittering. Upon inspection, I learned that the video was set to Progressive Scan. I changed it to Lower Field First and everything was golden.
Good Luck.

jp
[r]Evolution wrote on 3/10/2003, 8:50 PM
I am also having a similar problem. I am only trying to render the first 30 seconds, as a test, with 2 video tracks and 2 audio tracks. When I open the rendered file in a Media Player I can see the chops and stutters. The audio is also co...ing...in...an...ou. <--(That would be coming in and out) I have tried the different render resolutions but still get it. I have tried updating to Windows Media Player 9, my DirectX, my Video Card Driver, and my Audio Card Driver, Uninstalling & Re-installing VV4, Lowering HardWare Accelleration, and Rendering to a different drive. I noticed that it was not as bad when I rendered to MainConcept MPEG though; but it was still there.

P4, XPPro, 2.4Ghz, 512DDRram, 100gig & 100Gig 7200rpmHD's - There is nothing that chokes this thing up! (yet) So this rendering thing is really killin me. I never had this problem with VV3. The only problem is, I have the program built in VV4. VV3 will not read it or else I would just open and finish it there.

I will continue to tinker and check back in with you guys. If I find something out I will post it.

Till then,
Lamont
SonyEPM wrote on 3/11/2003, 8:32 AM
Is there a jitter in the file itself, or is this a playback performance issue?
ruckusmccoy wrote on 3/11/2003, 9:49 PM
Have you printed the file to tape and still have the issue?
- I first noticed this problem after printing to tape and viewing it on a tv.

Can you take the rendered file into a new Vegas project and see the issue while stepping through the footage?
- Now that I know its there, I can see it. I checked the raw format that was captured and no problem, but once I view the rendered video it looks like 20 frames per second. Very choppy.

The final output will most likely be MPEG 2 and AVI(VHS)

Thanks
Adrian

ruckusmccoy wrote on 3/11/2003, 9:57 PM
From what I've seen it is in the rendered file itself. The interesting thing is that the audio is on time and doen't even cut out during the choppy parts of the film (the last 60 minutes).

I don't know what to do next. I'm thinking to try and free up some hard drive space and probably do a complete re-install of VV3, unless you have any suggestions.

Thanks
Adrian
Tyler.Durden wrote on 3/12/2003, 6:25 AM
Hi folks,

Here's a thought...


Can you successfully render a thirty minute segment? Or break the original .veg into <30 min chunks and get error-free rendering?

This may be related to CPU temperature, which rises dramatically during rendering.


mph
dgeston wrote on 3/14/2003, 6:14 PM
I recently had a problem in VV3 that seems very similar. The program was in 3 segments from 3 different mini-DV tapes. The first segment was shot with a small consumer mini-DV camera, the 2nd and 3rd segments with a Sony VX2000. I captured all 3 DV tapes in the same Video Capture session. After rendering, the 2nd and 3rd segments had the choppy video appearance you described. I tried everything I could think of. Nothing worked, including what appeared to be several error-free recaptures of the last two segments.

Then I noticed that the audio track properties dailog box listed the sampling frequency as 32kHz for all 3 segments. I have never set the sampling frequency on the VX2000 to 32kHz, so I figured the tape from the low-end consumer camera had established the 32kHz rate in the Video Capture program and it treated the 48kHz audio in the 2nd and 3rd tapes as though it were 32kHz (?? not sure, just a guess). Even though playback from the timeline was fine, once rendered it had the problem.

So, I opened a completely new session in VV3 and made sure to set all audio properties to indicate 48kHz sampling rate. I launched Video Capture from within this session, and for the fourth time recaptured the tapes from the VX2000. I then imported the first segment into this new session and re-did all the edits. This time everything was fine. I hope this helps. I just about went in for counselling because of this problem!
DG