volleyball footage interlacing problem…

[Vincent Croce]

I just found out that by my slightly zooming in with the track’s pan/crop properties (to get rid of some noise along the edge of the captures) I had caused the interlacing problem. I didn’t know about this and have used the zooming before on other tape to dvd transfers I have done to get rid of tape compression noise along the edges, without noticing any problem. I guess the faster cam movement from this footage made the problem with this technique more obvious. I solved the edge noise problem by a slight black masking of the borders…
Any ideas why this happens?
Glad I got a handle on this, it’s due tomorrow…

Vin Croce
First Take Studios

[Mike Kujbida]

Vin, odds are pretty good that, when you zoomed in, you ended up on the wrong video line (odd vs. even or the other way around), thus changing it from lower field to upper field.
The only solution would be to zoom in or out further by one line.

[Laszlo Kovacs]

Hi,

check the “deinterlace method” in the project settings.
Because you zoom with pan/crop, deinterlacing must be done, and if you set deinterlace method to “none” that’s a fault.
Another option, that instead of zooming, make a black line over the head switching noise. This will have the advantage, that yoiu don’t need to deinterlace, so preserving motion information.

Regards

K.L.

By(t)e
Laca

[Vincent Croce]

Thanks, Laszlo, but as mentioned I did have the correct deinterlacing properties set for the project. I did use a rectangular black mask over the original un-zoomed footage to take care of the problem. And I will test out a one line change in the zooming to see if that takes care of the interlacing, Mike.
Thanks for the very fast replies!

Vin Croce
First Take Studios

[Douglas Spotted eagle]

If it’s volleyball, you almost certainly want deinterlacing method to be interpolated, not blended.
Also realize that it may be impossible to completely lose, because you are digitally zooming, thus making the recorded fields larger than they were.

Douglas Spotted Eagle
VASST

Certified Sony Vegas Trainer
Aerial Camera/Instructor

[Laszlo Kovacs]

Hi,
one another idea:
if you render using “best”, everything is done by vegas
(deinterlace, bicubic upsizeing etc.)

When you render it using only “good” deinterlace may not be done, and upsizeing is linear instead of bicubic (if I remember corretly).

So, if you set up the correct deinterlace method, it may be ignored when not using the “best” quality render.

Just try it 😉

DSE is most probably right with the correct deinterlace method.

Regards

K.L.

By(t)e
Laca

[Vincent Croce]

Thanks again, Laszlo, but as mentioned in my first post, I had the project rendering set for “best”. The footage looks fine now, even with the ‘blend’ method. I will try out the ‘interpolated’ setting the next time I deinterlace any footage with a lot of side motion. Thanks for the tips Douglas.

Vin Croce
First Take Studios

[Laszlo Kovacs]

[Vincent Croce] “but as mentioned in my first post, I had the project rendering set for “best”.”

Ooops.
Sometimes my poor english jokes me, sometimes I don’t read enough carefully.
🙁

Sorry for the unnecessary post…

Regards
K.L.

[Vincent Croce]

No apologies necessary, Laszlo. I just appreciate that you took the time to try and help me out. I understood your English quite well…I don’t speak any Hungarian. The closest I ever was to your country was Constanta, Romania, in 1975, when Chowchesku was in power. I thought the Black Sea coast was beautiful.

Vin Croce
First Take Studios