Verticle Line when panning on DV input?

[thete]

Hi

I'm new to the whole video capturing thing, and have just editied my first video (a wedding)! I use a firewaire cable, and ULEAD Video Studio 7. However, I;ve noticed two rather annoying things. FIrst when the peopel are moving fast, ie dancing, they becoem all corrupt on the preview screen, although this seems to disappear in rendering, so that is not too much of a propblem, and from what I have read here, is possibly just due to the fact that a TV screen is interlaced, and a Monitor isn;t!

The secodn, and much more important problem is that when ever the camera is panned round (epsiclaly in dark scenes) you get a weird verticle loine on the side opposite to the pan (ie, if it panns right, you get a line on the left hand side of the screen during the pan)! It looks almost like a mirror effect, but only a few pixels wide! I;ve looked on here, but all solutions seem to be due to wrong settings when encoding it to MPEG2, but this stange line is prsent on the original AVI files (I capture to AVI to start with), but not on the orignal tape when just played through to TV or Video! I enede up havign to crop the sides of the movie off to stop it, but this is obviously not somethign I wnat to have to do if I can help it! The probelm is obviously soemthign to do with capture, and I was woidneirng if there is a way to stop it?

Thank you for any and all advice you can give!

[HAGGARD]

thete,

For the first question i guess you have allready answered that yourself... It's the interlacing in the video.

For the second question I have to go more into detail about video tech...
Most DV camera's have some kind of picture stabilizer (eg. Steady Shot for Sony) to eliminate shaky recording during movement of the camera (did you ever tried filming without the stabilizer, try it and you'll know what I mean.... It's VERY difficult to hold the camera steady!!!).
Camera's with picture stabilizer have some kind of DSP chip which constantly analyses every frame if there was some (wanted or unwanted) movement of the camera. If this DSP chip detects some movement between 2 consequent frames, it tries to compensate this by either moving the picture horizontal or vertical a few pixels prior to recording it on tape.
This means in term that the picture is moving a few pixels left/right/up/down. Now... Normal television sets ALWAYS display video in overscan... This means that the picture what's displayed on the CRT is a little bigger than the viewing area what you normaly see on your television. For normal television it is about 9% (not viewable area). Videocamera's in term use this overscan "room" (because it is normaly not visible for the normal viewer) for picture stabilisation.
But capturing to computer captures EVERYTHING the camera did record, even the things you would normaly NOT see on a television... This though is not a problem, because if you edit video en record it to (S)VCD or DVD and then played back, the video should look like as it was played directly from the camera...

Hope this answered your question...

If you play video from your computer via TV-out and you want to display your computerscreen in overscan, look at http://www.tvtool.de

'HAG

[thete]

Wow, you are very good, thank you! I'm just glad it isn;t anythign I've done wrong, he he! Thanks for the tip about TVTool, I used to use it a few years ago when I had a NVidia card, but now I have an ATI Radeon 9000, so the TVTool, won;t work, you don;t happen to know somethign that would enable overscan for the ATI do you?

Just to make sure I have you right here, when I put it onto DVD it should dissappear as the overscan will come into effect again?

THnak you again!

[HAGGARD]

thete,

Sorry... I don't know a proggy to activate overscan for ATI cards, but interlaced video even on overscanned computerscreen still is CRAP.

Just to make sure I have you right here, when I put it onto DVD it should dissappear as the overscan will come into effect again?

YES! Overscan will come into effect again!!!

Glad that I could help you a little...

'HAG