Slow motion jitters...

promix wrote on 3/27/2002, 7:22 PM
I have a new Pentium4, 1.8gig machine with 512ram, Intel 850 motherboard, Matox G550 video card, Pyro Basic DV firewire card, and I'm using a Sony DCR-TRV17 miniDV camcorder. I am running VV3.0a on Win2000. If I slow motion a clip either by using a velocity envelope or "CTRL + drag end of clip" then render and print to DV tape, when I go to play the DV tape on a regular TV the slow-mo portions are extremely jumpy or jittery. The rest of the film is beautiful. This only happens when playing from my camcorder to the TV. The film looks fine on the camcorder's viewscreen. It looks fine on the composite output of my Matrox G550 video card. It looks fine in the Vegas preview window and on Windows media player. I have tried this with two other camcorders (and and a second TRV17) and had the same problem so I know its not a broken camcorder. I also tried it with a Digital 8 Sony camcorder with the same problem. Very weird. Am I doing something wrong when I render or print to tape? I checked both lower and upper field orders so I know that is not the problem - I am lost... Forum user "cheesehole" seemed to have a somewhat similar problem with slow motion, but mine is only on composite video playback from the camcorder to the TV - not the computer monitor or Windows media player. His symptom was "blocky" video, mine is jumpy and jittery motion. Any insight from "cheesehole or others would be helpful!

Comments

Cheesehole wrote on 3/28/2002, 4:06 AM
most of the time, checking the "resample" switch on a slo-mo event will solve the jitters problem. if that doesn't do it, try searching this forum on "Control_Z" as a user and "resample" there is a thread about this. since you only see the jitters on an interlaced display, you may want to double check the field order again. try rendering to DV progressive as a troubleshooting test.
promix wrote on 3/28/2002, 4:05 PM
BINGO! - Well that solved my case of the "jitters" BUT, it created a new little problem... You (cheesehole) seem to have a pretty good grip on the tech end of things, perhaps you have an answer: Now my slo-mo is clean, but when it fades into the next clip I get a little "blip" or "flash" at the very start of the new clip, right before you actually see it fade in. I've tried experimenting with resampling the whole project but I still get the glitch. Any ideas???
promix wrote on 3/28/2002, 5:25 PM
Never Mind.... After another hour of experimentation and troubleshooting, I noticed that I didn't have "quantize to frames" checked! That seemed to clear things up... :-)
Control_Z wrote on 3/28/2002, 6:45 PM
Ya - resampling and everthing else I tried didn't work for about 5% of my clips. What really amazes me is that the option to _not_ resample slo-mo wasn't removed in the last update. Or at the very least resample should have been made the default.
Cheesehole wrote on 3/30/2002, 11:28 PM
>>>Or at the very least resample should have been made the default.

that would be okay, but I wouldn't want the option to render without resampling removed. in my opinion more control = better.
HPV wrote on 3/31/2002, 1:34 PM
>>Ya - resampling and everthing else I tried didn't work for about 5% of my clips.

Those clips might have flipped field order on you. I've had it happen here.
Side note, you do want opposite field order for negetive velocity stuff. To use both requires a copy of media that will hold it's own field order properties.

Craig H.
Cheesehole wrote on 4/1/2002, 2:25 AM
>>>Side note, you do want opposite field order for negetive velocity stuff. To use both requires a copy of media that will hold it's own field order properties.

What!? you mean Vegas doesn't handle that on its own? that doesn't sound right.
SonyEPM wrote on 4/1/2002, 9:10 AM
Have you tried enabling "Reduce Interlace Flicker" along with resample?

Be careful swapping the fields- in every case I have seen, that will make the footage look worse.