A Video Capture Mystery

BrianStanding wrote on 3/21/2004, 6:25 AM
Last night, I captured some video I'd shot with my PD-150, using VidCap and my Panasonic AG-DV1000 deck connected by firewire. Everything went normally, clip appeared to be digitized appropriately.

Then, when I put the clip on the timeline in Vegas, I noticed that the video preview wasn't completely smooth. I looked to see if I had inadvertently bumped the clip level or track level, and it was fine. There were no video FX on the event, media, track or project level. I didn't think anything more of it, and went to print to tape. When it got to the clip that had the low frame-rate preview, Vegas rendered the whole clip (instead of just the transitions). All the other (DV) clips remained unrendered except for the transitions, as you would expect.

Project settings were set to the DV NTSC template. Then I took a closer look at the media properties on the offending clip, and the video format was uncompressed, instead of DV! I double checked this using the G-Spot codec reader, just to be sure, and sure enough, it was an uncompressed video file.

In this case, it was a short piece, and the resulting video was fine, so I'm not looking for an urgent fix. But, I'm still puzzled. How could I get an uncompressed video file when the video was shot on a DV camera, and digitized over firewire? Is there some obscure setting in VidCap that I inadvertenly hit that stores files as uncompressed video?

Comments

cyanide149 wrote on 3/21/2004, 6:43 AM
I was led to believe that DV clips were already compressed 5:1....or is that the same as "uncompressed"?
BrianStanding wrote on 3/21/2004, 6:55 AM
You're right. DV is compressed in the camera into the DV codec. Uncompressed video is a different beast, with no compression codec at all. An uncompressed file takes up five times the space of a DV file.

That's what makes the whole thing so odd. How did my in-camera raw DV file end up getting uncompressed in the first place? Or, maybe I should check that file size and see if there's just something messed up in the file header? Is that possible?
rebel44 wrote on 3/21/2004, 10:03 AM
The compression occur at camcorder, but you can de-compress by using avi uncompress setting(that what propably happen). Check your settings for capture options.