I did a test based on a post I made in Filmy's thread (http://www.mediasoftware.sonypictures.com/forums/ShowMessage.asp?MessageID=220257&Page=1).
Here's what I did: I took a clip I captured and plopped it on the timeline. I checked it for black frames. None. I even checked the start and end of the clip.
The clip was alone on the timeline.
I rendered the first and last 3 seconds of the clip to a new track (New Track 1 & 2). Checked those for black frames. Track 1 (the first 3 seconds) didn't have any. black frames at the start or end. Track 2 (the last 3 seconds) had a black frame AT THE END.
I zoomed in on the timeline. A black frame thumbnail showed up. It was black in the preview window too. I changed my preview quality up to Best (Auto) from Preview (Auto). Still there. Hmmmm... I changed to Best (Full). Black frame DISAPEARS and it replaced be an interlaced picture. The odd fields are black, the even are my picture.
Why?
Well, the preview NTSC only shows the even fields unless you have the preview setup to Full.
When you render it will take 1/2 of the frame (odd fields) from the current frame, and the other 1/2 of the frame (even fields) from the NEXT frame.
If you next frame is black, you get a black frame (or an interlacedblack/picture frame).
Solution? Have video AFTER your pre-render's and new track renders.
Now, Filmy, I belive you said that Premiere didn't do this (well, not directly, but i belive you hinted this). Just so everyone knows, I DUPLICATED THIS IN PREMIERE!! It's NOT a Vegas "glicth," it's the way NLE's handle interlaced footage.
The reason I've never had this happen before is because when I do my pre-renders (new tracks), I render finished parts: ie parts with footage after them.
Go ahead and try it yourself: take a captured clip. Render the first 3 seconds to a new track, the last 3 seconds to a new track. Zoom in and view. Delete your new tracks, leaving your origional clips. Plop another clip up against the end of the 1st. Render to a new track a 3 second clip of where they meet (1.5s before and 1.5s after the join). Find the joint and see no black frame.
Duplicate this in Premiere, FCP, Avid Free DV, whatever. It will happen in almost every one of those i bet.
:)
Here's what I did: I took a clip I captured and plopped it on the timeline. I checked it for black frames. None. I even checked the start and end of the clip.
The clip was alone on the timeline.
I rendered the first and last 3 seconds of the clip to a new track (New Track 1 & 2). Checked those for black frames. Track 1 (the first 3 seconds) didn't have any. black frames at the start or end. Track 2 (the last 3 seconds) had a black frame AT THE END.
I zoomed in on the timeline. A black frame thumbnail showed up. It was black in the preview window too. I changed my preview quality up to Best (Auto) from Preview (Auto). Still there. Hmmmm... I changed to Best (Full). Black frame DISAPEARS and it replaced be an interlaced picture. The odd fields are black, the even are my picture.
Why?
Well, the preview NTSC only shows the even fields unless you have the preview setup to Full.
When you render it will take 1/2 of the frame (odd fields) from the current frame, and the other 1/2 of the frame (even fields) from the NEXT frame.
If you next frame is black, you get a black frame (or an interlacedblack/picture frame).
Solution? Have video AFTER your pre-render's and new track renders.
Now, Filmy, I belive you said that Premiere didn't do this (well, not directly, but i belive you hinted this). Just so everyone knows, I DUPLICATED THIS IN PREMIERE!! It's NOT a Vegas "glicth," it's the way NLE's handle interlaced footage.
The reason I've never had this happen before is because when I do my pre-renders (new tracks), I render finished parts: ie parts with footage after them.
Go ahead and try it yourself: take a captured clip. Render the first 3 seconds to a new track, the last 3 seconds to a new track. Zoom in and view. Delete your new tracks, leaving your origional clips. Plop another clip up against the end of the 1st. Render to a new track a 3 second clip of where they meet (1.5s before and 1.5s after the join). Find the joint and see no black frame.
Duplicate this in Premiere, FCP, Avid Free DV, whatever. It will happen in almost every one of those i bet.
:)