compusolver Wrote:Steve’s


compusolver Wrote:

Steve’s made some good comments on these forums, but I’m going to strongly disagree with him on this one.

If there were any validity and value to striping, then there would be a market for pre-blacked DV tapes. There was such a market for pre-blacked analog tapes because it was an issue then, but with most DV cameras, it isn’t an issue at all.

If you don’t remove the tape between shots then you shouldn’t have a problem. It has nothing to do with memory, power or battery. When you stop the tape, most DV cameras will back up so that the last frame shot is under the heads. (The “End Search” button, if you have one, also finds the last frame shot). When you power-up again, the first thing the camera does is to read the timecode from the tape. If you remove the tape or advance it past the last recorded frame, you will get 00:00:00;00 for your timecode. This is poor procedure, but it is what pre-blacking the tape attempts to prevent. It almost assures that the heads will read a timecode when you power-up, but it’s no gurantee of a continuous timecode. In fact, it could *cause* a timecode glitch. The camera writes a new timecode with the video data. If you started recording one frame *before* the pre-blacked area starts, then your new timecode will not match the old (pre-blacked) timecode. When your camera starts up, the “end-search” function is defeated because when you start the camera, it finds a timecode under the heads. Which timecode did it find?

If you are using a prosumer camera and getting timecode breaks, then you need to re-examine your tape handling procedures or possibly have the camera checked to make sure that the “end search” is working. Pre-blacking only hides the problem, or exacerbates it.

Steve Mann

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