An MJPEG-to-DV field order conondruminum!

[fluggo99]

Here's a head-scratcher. If anyone's been following my problems with the jittery output of my Matrox card, I essentially said "screw that," threw my 1394 card into my system, borrowed a D8 camcorder (my apologies ) and set off down the path of converting MJPEG to DV.

Trouble is, I had no idea of what field order to go to, so I tried things and previewed them through the camcorder onto a TV. I tried a direct conversion (field B->field B). The picture looked weird.

I shifted the image down by one pixel (field B->field A). Picture still looked weird.

I deinterlaced the video. Everything looked fine, besides the drop in picture quality.

<font color="#FF0000">!!!?!?!?!!!</font> What the hey?

"Weird" is defined, in this case, as seeing some parts of the image with backwards-looking field order, regardless of what I did to it before sending it out.

I'm using MSP 6.0, before the DV update (because of MSP's inability to open my MJPEG files after the update, as I mentioned before), encoding to type 1 DV (because my frickin' card don't work none with type-2!!).

HELP!!! MORE HELP!!!

[This message has been edited by fluggo99 (edited 17 September 2000).]

[Grigory]

Try to use VirtualDub or avisynth.
In VirtualDub, use General Convolution filter with single 255 value in top center. The processing will go on frame basis, which definitely inverses the field order.

In avisynth there are several options too.
I am not sure if you can make type1 avi with these tools. But, you can use VirtualDUB or avisynth as frameservers.
Once I managed to convert Matrox MJPEG to Canopus DV, but in Premiere, and this was not an easy thing. I used Morgan codec and tried all combinations of field orders in codec settings until I found working one. Note: you MUST work in frame based mode to be able to change the field order, otherwize your shifting is done within each field individually.

Grigory