velocity envelope side effects maybe?

Doug_Marshall wrote on 10/30/2004, 11:10 PM

Here's the scenario: two "identical" live concerts captured with two cameras placed differently for each performance. Audio captured separately. First, I edited the audio. Now I'm assembling shots and lining up the video with the audio. Of course, some shots don't line up perfectly due to variations between the performances, so I'm using the video velocity envelope as needed. But I get an annoying flickering sometimes that is driving me crazy. Is the change in velocity the cause or something else? What say ye?
- Doug

Comments

B.Verlik wrote on 10/31/2004, 12:25 AM

To get the most accurate answer, you need to provide as much information as possible. Did you use the same type of camera on both angles? One camera may be giving you the opposite field 1st. Use the audio of the camera's to line up the video. Then sync the separate audio to the video. Then pray that you don't encounter other problems when you render. I always insist that people set their 'Project Properties' and 'Ruler' tab within, to 'SMPTE non-drop', but others will say that shouldn't matter. Make sure your audio is going in at 48,000Hz for all 3 sources. I've used both Digital 8 camera with a Hi-8 camera and not had any sync issues, but I haven't tried syncing a separate audio source to those yet. To me, it would be easier to sync (velocity) the audio to the cameras, but they should be very close already. Just guessing, based on the info you left. ('Project Properties' is the icon above the preview window in vegas on left side of window.)

Doug_Marshall wrote on 10/31/2004, 5:54 PM

Thanks for your input, Steve. I've got video lining up with the audio pretty well. However, since the audio is an amalgamation of the best playing from two performances, the video doesn't track it exactly (unless both happen to be from the same performance). The velocity envelope solves this but I get this annoying flickering sometimes and, suspiciously, it seems to occur when the velocity is not 100%. I should probably check my original tapes (Digital8) to be sure. Has anybody experienced this problem?

jetdv wrote on 10/31/2004, 6:38 PM

Before or AFTER rendering? During a PTT?

jaegersing wrote on 10/31/2004, 7:43 PM

Hi Doug. I hesitate to suggest the obvious, but have you tried checking the "Reduce Interlace Flicker" under clip properties? I think this is intended to improve such flickering when you change the clip velocity.

Richard Hunter

Doug_Marshall wrote on 11/1/2004, 8:33 AM

After rendering. It's there in the Vegas preview if you really look but it's not very obvious. I've followed advice about getting maximum results during rendering, rendering direct to MPEG2 at highest quality, etc. I'm sorry to have to ask, what's a PTT?

Doug_Marshall wrote on 11/1/2004, 8:34 AM

Thanks Richard, I'll try it. I wasn't aware of that one. I'm still a newbie at the video side of things.

jetdv wrote on 11/1/2004, 9:30 AM

PTT=Print To Tape

or as it's worded on the menu "Print Video to DV Tape"

Doug_Marshall wrote on 11/1/2004, 12:57 PM

Richard and all, Thanks so much for your help. "Reduce Interlace Flicker" did the trick. How could I have missed it?! Well, considering the feature depth of Vegas, pretty easily, it seems. Onward and upward! - Doug