How to prevent 'jitters' using Pan and Zoom

[jparnold]

I have an image whcih is 5943 x 3342 pixels which I want to Zoom in to an area approximately 1920 X 1080 and then Pan across the image.
I am using the Pan and Zoom feature and have set it up to my liking.
Problem is when I play the rendered video clip it 'jitters' - the pan action is not smooth. I considered that this could be prevented by adjusting how long the clip runs for and so adjusted the 'length' quite a few times but never achived a real smooth pan (I was thinking that if the panning moved at say 1 pixel per 1/30th second it would be smooth - I render to MPEG4 30fps).
Is it possible to ensure the panning results in a smooth video and if so how do I do it.

[Davidk]

two thorts:
1. does it jitter on playback in edit mode?
2. Depends a little on what your idea of jitter is. If it is the image moving up-and-down either regularly or irregularly, have you tried using the Mercalli filter to smooth it out?

X6 - which your profile says you are using - may also be a bit old for the size of image you are working on. It is more than 4K.

[jparnold]

Yes the jitter happens on playback in editing phase also. What I mean by jittering is is when the panning goes from left to right it is NOT smooth fluid motion. The motion appears to jump 2, 3, 4 or more pixels at a time instead of 1 pixel per frame almost as if one was viewing motion at say 10 frames per second.

[lata]

Hi John
Taking more water with the drink sometimes reduces the jitters

What are your project properties set to?
You are in AU as such should have your program installed to Pal using 25fps, unless of course you have installed to NTSC for some other reason.

If the Project is set to 25fps then you render to 30fps, additional (5) frames will be added, I would think affecting the Pan & Zoom settings
Try rendering to Same as Project Settings
You do not tell us the duration of your image, how long is the image displayed on the timeline.?

[jparnold]

Hello Trevor
Sorry I thought the fps was 30.
The project properties are 25fps and I am rendering to MPEG4 also at 25fps.
Looking more closely at the 'animation' (from panning) the image actually looks like it is shaking side to side just a little, almost like 'shimmering'.
The length is 17 seconds.
I have included the vsp file but cannot include the image as is puts it over the 600kb limit (only just at 604kb). The shimmering in the rendered video is most noticable towards the end.
John

[lata]

Hi John
The forums will not except a VSP file, a little odd to say it’s a Video Studio forum
if you create a new project containing just the Image with pan and zoom then it will be small >20Kb
and if you re-name the VSP to use .txt as its extension then you can attach the file

We can re-link to one of my own files, I assume you are using Jpeg images.
Then check your settings for P&Z, not a lot to go wrong there.

I have run a few tests using X7, don’t have X6, but all look ok provided the frame rates are correct.

[jparnold]

group photo vs6.rar

(1.21 KiB) Downloaded 67 times

Hi Trevor
I had 'archived' the vsp file to a .rar file so do not know why it didn't go through maybe because I named it "group photo vsp.rar". Weird.
The jpeg image is 602Kb so exceeds the max file size. I have tried to attach another .rar file of the project without vsp in the name.

BTW I don't know why but when I tried to install the freebie VS7 (because I was a beta tester) it tells me that the password is incorrect yet it is the one which Corel gave me when they sent the link to download the program. Strangely the password they have me has a combination of UPPER and lower case and numerics but when I enter the password it gets converted to UPPER CASE. Maybe that is the problem but why does it convert? The username is VSX7Betauser2. Not happy about that. I can't remember if I ever tried to install it before, I thought I had.

[Ken Berry]

Was X7 sent to you when Beta testing was over, or was it one of the beta test downloads? If the latter, then the password would have expired not long after beta testing concluded.

[Davidk]

The jitter as described sounds very like process overload: working on certain frames, the image seems to pause and when the overload clears, the image 'jerks' to it's new location. I have the very same issue with loading an HD image without smart proxy from a USB2 source: the combination of windows, page file, VS and working RAM, and the slug performance of usb2 data transfers on video clips in real time give just that effect. Take one of the main computationally loading elements out of it - like VS - and the jerk either reduces or goes away when viewed on a player. For my case, using smart proxy helps. But smart proxy on a still image may not have any effect at all.

All of which suggests to me that the main cause of your jitters is the very large resolution image your are working with. Recall also that this is the resolution that needs to be processed for EVERY frame. So, some suggestions:
- if you don't need fast or slow motion, try using 25fps rather than 50fps: reducing the frame rate reduces the computational loading the image places on the processor by VS (which in any event is not known for using more than one core of a cpu even if more are available)
- most all, reduce the size of the base image: if the pan is just left to right or vice versa flat (ie not rising or falling across the image as it pans) then trim it. To get the effect you want maybe you will have to make 2 smaller size images, loaded side by side and pan across them with the same settings tweaked so the pan exit on one is the pan entry on the other.

X6 was the last version before 64bit capability was released in X7.

[RobertOZ]

Also, I am not sure about the user name, don't remember if Corel gave me a specific user name, VSX7 was a long time ago,(2014?) but surely your user name would be one you created yourself.
VSX7 was also the first version available in both 32 bit and 64 bit, make sure it is the 64 bit version you are trying to install, if that actually makes a difference

[Ken Berry]

I agree Robert. That's why I asked when they had assigned him a username. I suspect it's a beta download he has...

[jparnold]

Thanks Ken and Robert,
I've got it. The disk I created I now think WAS for beta testing as I found in my 'trusty' backup CDs a file I named VSX7_Ultimate together with a 'normal looking' serial number (the one which I had for the beat tester was just 8 characters).

I will reply to the other posts (thanks for those) once I have time to read them slowly and understand what is being said.
John

[RobertOZ]

John,
From what I can make out from my archives, the full version of VSX7 was issued to us after Beta Testing finished, but the serial number was not given to us until a month later, I believe, at that time all beta testers had the same serial number for the beta versions, it was only for later versions of VS that we were given our own serial at the commencement of testing.
So I wonder if you have misplaced the serial sent to you and are still using the beta number. Your Corel account should show all the serial numbers issued to you

[jparnold]

Thanks Robert,

I have found a file in my 'archives' named VSX7_Ultimate_Bonus_X64 together with a serial number which looks like a 'normal' serial number (starting with VS17R22 and containing 3 other groups of 7 characters separated by hyphens.

Trouble is when I run that file (either normally or as administrator) it prompts me where to copy the setup files to then starts and prompts me which 'addon' to install (eg NewblueFX) and regardless of which ones (or non) I choose it does not install. The setup files are written to the location I choose and even it I attempt to run setup from there it fails.
I seem to recollect that perhaps there is a particular method to use to get this installed and would appreciate it if someone remembers what it is.

[RobertOZ]

I did consider reinstalling VSX7, but decided against, when I thought about what effect that may have on VSX10 and VS2019 already installed.
Hopefully, Trevor can resolve your installation issues, as he has VSX7 installed