Wierd event gaps

cacher wrote on 6/6/2003, 9:50 AM

I captured about 1 hour of DV with Vegas capture app, selected all the clips from the media pool and dropped them to the timeline (auto-overlap was off). I started to do some crossfades and transitions, pressing F (ripple edit) after I moved the event to the left (for crossfades). After 5 or 6 events (1-2 min. each) y did a test run and found that the events that I hadn't edited yet were not jutting together, there was a very small gap between them, you had to zoom ALL the way in, and even then the gap would be small (about the size of a hyphen -). This would show as a black frame in preview. To add to the wierdness the audio part was NOT the same size of the video part (about 2 or 3 hyphen lengths at full zoomm, which I think started all the gaps in the first place. To confuse things further, if you tried to adjust the video event to match the size of the audio event, suddenly the audio would correct itself and both would be the same size. I spent a lot of time doing ctrl-alt-right at max zoom and fixing the length of audio/video and clearing the extra blank space that resulted. I just needed to "grab" the event's end and move it a couple of pixels left right and the length would adjust by itself. Anyone is seeing this thing? I really think it's a huge waste of time. (Win2k P4 2.4 Vegas 4.0c 256ram)

Back to post

Comments

johnmeyer wrote on 9/3/2003, 11:17 AM

Has anyone had a corollary problem to the one discussed in this thread, namely the unwanted, but very small, overlapping of events? I have many projects where events get overlapped by exactly one frame. This is almost impossible to detect when watching the resulting video, so it is not as bad as the one frame gap. However, if you print to tape and later re-capture that tape, the capture program goes bonkers because the one-frame transition gives the capture program a one frame interruption in the time stamp.

I bring this up only because I suspect it may have the same root cause as the one frame gap and, like that problem, it has been around for a long time (going back to VideoFactory code and Vegas 3.x).

Former user wrote on 9/3/2003, 4:24 PM

These seem to show up when you use whole clips. I have often wondered, when you capture with scene detect. And it breaks the scene, does it actually do it between frames, or is it a DATA based break. In other words, could there be a frame and a few bits left over that cause it to be long when drug to the timeline (or short).

Dave T2

HPV wrote on 9/3/2003, 6:51 PM

I don't have the "extra" video problem here. Most my captures from Digital 8 have one sample shorter audio than video. I chalk that up to DV not having locked audio. Most everything I shoot I end up trimming the tails anyway, so no biggie here. One time I had a clip go way out of sync. Turns out it started where I had unplugged an external mic from the camera while recording. Major audio spike. It caused all clips after that to have sync. problems also (scene detection turned on). Recapture starting after the spike fixed it.

Craig H.

HPV wrote on 9/3/2003, 6:59 PM

BTW, I've changed the VidCap internal setting for audio sample rate from factory 44.1K to the DV spec of 48K. Why is it stock setting for 44.1K? Could this be part of the problem?
I've also set the minimum clip length to 0 sec. I'll reset everything to stock settings and post my results.

HTH
Craig H.