I have searched these forums and have caught a couple of references to a "Stop Flicker Filter". I am currently trying to overlay a video in the lower right hand corner of a video I am producing, and every time I burn to DVD and view the DVD I get a flicker effect happening on the smaller video.
If my video is playing on a standard DVD player and being projected by an overhead projector, what would be the best format for the finished video? Interlaced or de-interlaced? Upper or lower field or frame based? I have some knowledge of these terms but not extensive knowledge.
Any help is appreciated,
Brian Allen
Stop Flicker Filter in VS9?
Moderator: Ken Berry
Hi Brian,
as far as I know, the "anti-flicker" filter just helps for static menus and so on. It does help for those, but I've never been able to see any effect in moving video. Still, there can be no harm in trying it - you'll find a check box for it both in "Options..." when using "Share" >> "Create Video File" and also in the "Settings and Options" tab when using "Share" >> "Create Disc"
You could try applying a frame to your overlay video, if the flickering you see is aliasing around the edge of the overlaid video. You should also view your DVD on the device you are intending it for - you can get misleading results if you view it on your pc.
I don't know if your projector is an interlaced device - but you should be able to check its specs to determine that. Assuming it is interlaced, you should usually use Lower Field First if you have firewire captured MiniDV source material, Upper Field First for captured analogue material. Not sure what the recommendation would be if you use mixed source material.
good luck!
as far as I know, the "anti-flicker" filter just helps for static menus and so on. It does help for those, but I've never been able to see any effect in moving video. Still, there can be no harm in trying it - you'll find a check box for it both in "Options..." when using "Share" >> "Create Video File" and also in the "Settings and Options" tab when using "Share" >> "Create Disc"
You could try applying a frame to your overlay video, if the flickering you see is aliasing around the edge of the overlaid video. You should also view your DVD on the device you are intending it for - you can get misleading results if you view it on your pc.
I don't know if your projector is an interlaced device - but you should be able to check its specs to determine that. Assuming it is interlaced, you should usually use Lower Field First if you have firewire captured MiniDV source material, Upper Field First for captured analogue material. Not sure what the recommendation would be if you use mixed source material.
good luck!
JVC GR-DV3000u Panasonic FZ8 VS 7SE Basic - X2
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Citizen Kane
Effect of AntiFlicker Filter on Video
Brian
Would be interested in seeing if you see any effect on your video (and exactly where) if you apply the filter.
For instance, I use a lot of still images with titles that may or may not roll. Sometimes I'm showing on an LCD computer monitor, sometimes, an LCD projector, and sometimes a Sony WEGA TV via S-Video.
I haven't been using the filter but maybe I should be based on what 2Dogs has said about the filter being most useful for static images.
Patrick
Would be interested in seeing if you see any effect on your video (and exactly where) if you apply the filter.
For instance, I use a lot of still images with titles that may or may not roll. Sometimes I'm showing on an LCD computer monitor, sometimes, an LCD projector, and sometimes a Sony WEGA TV via S-Video.
I haven't been using the filter but maybe I should be based on what 2Dogs has said about the filter being most useful for static images.
Patrick
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brianosmi
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Unfortunately we had to give up on it as we could not eliminate the flicker no matter what we did or tried. I tried all of the suggestions above and then some, all to no avail.
We also display video on a variety of devices, so it is very difficult to determine what is the best format for the final product.
We also display video on a variety of devices, so it is very difficult to determine what is the best format for the final product.
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Briefly there are 3 formats.
1. Frame based.
2. Upper field first
3. Lower Field first.
There are several lengthy articles in this forum and also on the internet discussing what field order means but in a nutshell it's as follows.
a) A television picture is made up of several horizontal lines - 625 in the PAL system.
b) A moving picture is like the cartoon flick books we all made at school where you flick the pages over quickly and the drawings appear to move.
In the PAL system there are 25 frames or pictures passing before your eyes every second (just under 30 in the NTSC system.)
c) Instead of the TV picture drawing the whole picture every 25th of a second it draws every other line. Because everything is moving so quickly you don't notice.
You have to make sure it draws these lines in the correct sequence otherwise you go forward a bit, then back a bit, then forward two bits, then back a bit etc and everything - especially movement - appears very jerky.
On the other hand, Frame Based draws the whole picture.
If you are displaying an image on a computer monitor you can/should use frame based as it does not work in the same way as a TV set.
Now to the correct field order, upper or lower.
This is determined during the capture phase and not the playback phase.
If you are capturing from an analogue source (such as a TV card) then you capture in upper field first.
If you are capturing from a digital source (Such as a digital camcorder connected to the computer with an IEEE1394 firewire/iLink cable) then you capture lower field first.
Still photographs - whether they be scanned or from a digital camera are neither and so are frame based.
1. Frame based.
2. Upper field first
3. Lower Field first.
There are several lengthy articles in this forum and also on the internet discussing what field order means but in a nutshell it's as follows.
a) A television picture is made up of several horizontal lines - 625 in the PAL system.
b) A moving picture is like the cartoon flick books we all made at school where you flick the pages over quickly and the drawings appear to move.
In the PAL system there are 25 frames or pictures passing before your eyes every second (just under 30 in the NTSC system.)
c) Instead of the TV picture drawing the whole picture every 25th of a second it draws every other line. Because everything is moving so quickly you don't notice.
You have to make sure it draws these lines in the correct sequence otherwise you go forward a bit, then back a bit, then forward two bits, then back a bit etc and everything - especially movement - appears very jerky.
On the other hand, Frame Based draws the whole picture.
If you are displaying an image on a computer monitor you can/should use frame based as it does not work in the same way as a TV set.
Now to the correct field order, upper or lower.
This is determined during the capture phase and not the playback phase.
If you are capturing from an analogue source (such as a TV card) then you capture in upper field first.
If you are capturing from a digital source (Such as a digital camcorder connected to the computer with an IEEE1394 firewire/iLink cable) then you capture lower field first.
Still photographs - whether they be scanned or from a digital camera are neither and so are frame based.