Rendering problem

phantomias wrote on 5/30/2002, 9:05 AM

When I put a clip onto the timeline and render it without any editing, it should use smart render and rendering should go very fast. Well, it does, but the result is jittery as it is when you use wrong field orders.
In the media properties vegas shows the files being 'lower field first'. I use the 'set output properties to file properties' function in the render dialogue to ensure correct settings, but get the jittery result. If I change the field order in the render dialogue to 'upper field first', the video comes out perfect (with motion blur typ: none). But it needs more time to render. How's that? Does vegas detect wrong field orders in the files? (i captered the files with vegas own capture-prog)

egon

Comments

SonyEPM wrote on 5/30/2002, 9:15 AM

Is this a DV clip (shot with a DV camera) or did you use an analog capture card?

phantomias wrote on 5/31/2002, 5:29 AM

DV, captured by vegas capture window from a Sony TRV30.

egon

phantomias wrote on 5/31/2002, 7:52 AM

Just tried the nuge tip: nudged a clip back and forth in different lengths with no luck. Still very jittery. Looks like the clips are played 1,4,2,5,3...
I'll create a picture sequence out of the resulting image and have a look.

egon

luisbcn wrote on 5/31/2002, 9:05 AM

Have you tried defragmenting your hard disks??
May sound silly, but it happened to me...

phantomias wrote on 5/31/2002, 3:25 PM

bad and good news:

bad - the results of the image sequence: 2,1,4,3,6,5... and after a closer look it seemed, that some frames were made out of totally different fields.

good - solved the problem by disabling blur in project settings (gaussian). now everything works fine. so what's that blurring good for?

egon

SonyDennis wrote on 5/31/2002, 9:27 PM

When you nudged the event, did you have Quantize to frame turn OFF? If not, please try that. Zoom in, so the 1-pixel nudge becomes a small fraction of a frame. Let me know how it works.

We're addressing this issue with version 3.0b, which is in the pipeline.

///d@

phantomias wrote on 6/1/2002, 7:52 AM

tried it with quantize on as well as off. it had no effect either way. as far as i understand the quantize feature, it's done to snap to frames. so when do one have to disable this function? in pure audio editing? certainly not in video editing.(?)

regarding the problem i had: it seems to me, that the blurring is working incorrectly.

phantomias wrote on 6/1/2002, 10:18 AM

i just tried to render a clip on a different pc with blurring activated: same result - jerky video like on the other machine. must be a blurring bug (tried gaussian, asymetric gaussian, and pyramid).
(Win98SE, ohci-card)

phantomias wrote on 6/3/2002, 1:38 PM

it's definetly something to do with the blurring. i tried different exposure times for blurring and get a video with alternating blurred frames, jumping back to earlier unblurred frames, then jump forward and go on with blurring and so on. maybe sonic foundry should have a look at the blurring feature?

SonyEPM wrote on 6/3/2002, 4:01 PM

Try rendering (just the footage that needs motion blur) as progressive DV. It should look smooth in just about every case.

Alternately, you could fish for the right settings for each piece of footage and make a bunch of separate interlaced renders...but the progressive trick almost always looks good and smooth no matter what the source or blur settings.

phantomias wrote on 6/5/2002, 7:09 AM

Sorry, but even when I check the resample button, the rendered video jumps between the frames. As soon as i set blur to none everything is fine.
From my point of view it's a blurring bug. Somehow the frame order is being mixed to a different order during the blur-calculation.
Maybe nobody uses this feature, so it's been undetected so far?

pelvis wrote on 6/5/2002, 8:40 AM

did you try progressive?

SonyDennis wrote on 6/5/2002, 9:50 AM

If you set your Video Preview to "Best" quality, and "Display at Project Size", the frames you see there come from the same place as they do during rendering. Can you see problems just stepping through the timeline?
///d@

phantomias wrote on 6/5/2002, 5:39 PM

sorry, i didn't check the progressive option. now the video isn't jerky, but has a slight stroboskopic effect, looks kinda like shot with slow-shutter. without blurring -again- it's fine.
if i preview from the timeline everything is fine. if i render without blurring everything is fine. but as soon as i turn on blurring i get frame-mixed results, that i can see on the PC-monitor...