Clipping when moving small images using Motion or Position

kayakbill

This is the problem: I overlay a small square image and scale down place it far bottom right using Motion (same effect with Scale then Position). I move the small image from far right to the far left and everything looks fine in the clip preview the right left panning is as it should be. I look in the sequence preview and the movement is clipped about two thirds of the way to the far left hand side so the image in effect vanishes. In the clip preview when showing the background, the small image is oversized and extends way beyond the rectangular background image. Is this a bug? An aspect ratio issue? Am I missing something? I am able to resolve the issue by generating a new image the same size as a single frame and moving that instead, but there are major interface performance issues related to that approach. Any ideas? Thanks, Bill

kayakbill

I can also circumvent the problem by increasing the canvas size of the small image so it has 16:9 proportions. When I place the image new overlay track it now at least is the same size as the video frame and Motion works as expected. Surely I am not require to change the aspect ratio of every image that use to that of the video?

kayakbill

Here is a video example showing a 256x256 image of a fish moving right to left. The top fish is 256x256. The lower fish is 391x218 (16:9) ratio more or less. The video is 1920x1080. The fish has also suffered in terms of image quality. https://youtu.be/ziD8nuZv-1Y

[deleted]

kayakbill

You have to scale down via Motion or Scale. I don't see any options that tell the software not to scale up to fill the screen on placing an image.

kayakbill

Another "work-aound" for my case is to apply the letterbox 16:9 ratio. The image is invisible in the clip preview when applying the motion filter but visible in the sequence preview once placed. I get a feeling that the effects interface is very buggy.

[deleted]

Hi Kayakbill

".... I don't see any options that tell the software not to scale up to fill the screen on placing an image. ...."

There isn't and that was my point. You can scale any image up (and down) yourself using the Scale effect and keeping AR unchanged. (Moving that up-sized image however, using Position doesn't work as the Scaling UP also crops the image) My point was Why does VP automatically scale up the small image?

After a little thought...I suspect it's because the VP preview screen does not now have a user defined size...only AR. In effect ALL clips and images with the same AR whatever their resolution are now scaled to fit the preview screen. (Not logical IMHO)

Although I can't run your UT video (old browser🙁on Vista) from what you say you just need to scale down your overlay/s and then use Position effect with keyframes to create your movement. The overlays can then be moved completely in and out of the background image.

Nat

borate

Here's the approach that appears to do what you want...

Begin with a 1280x720 background (track 1) and a small overlay (track 2) as Nat describes above.

Click the fx on the overlay and choose MOTION.

Set SCALE to .20

VERTICAL 75

HORIZONTAL -100

X BASE, -20, which moves the image off-screen left.

The image will temporarily vanish when scrubbing (possible bug) but the box containing it remains, showing the correct positioning.

Set a keyframe, then move the scrubber (red line) to the end of the overlay.

Set HORIZONTAL to +100

X BASE +20, which moves the image off-screen right. Set a keyframe.

Play. The export looked good at the 1280x720 default settings.

[deleted]

Well..Yes that works but isn't it simpler to use ..

Scale to suitable size
Position/keyframe...........Position/Keyframe etc.

Monitoring the result is quick and easy in both Clip Preview and the Sequence preview. (Particularly with dual preview). No figures to think about and WYSIWYG

Nat

borate

Works for me. The image occasionally vanishing is an item that likely should be fixed.

[deleted]

Hi B

If it works.......🙂

Nat

kayakbill

Thank you for the responses - all very much appreciated. For reference, I am using a Win 10 system, version 7.25 of VideoPad using an onboard graphics card on a fast system. Performance should be very good in terms of the interface.

The vanishing image inside the container is a quite consistent bug. An inconsistent bug is the container becoming unresponsive to mouse control, which is released by entering changing a value using the sliders. When I snapshot the sequence the smaller image is also missing despite being visible in the sequence.

I suspect that the performance hit when using the WYSIWYG interface is due to the effect changes being tied to the track preview which seems to take a long time to update.

I have tried the Borate's solution and was unable to replicate with my square smaller image. Borate's smaller image seemed to be more rectangular than square. The result I saw was that there was movement in the middle of the screen but the image was clipped left and right as if constrained by an invisible square. Moving the image beyond the bounds of the visible clip preview area had no effect on this.

The only resolution that I have found that is effective is:

Letterbox to aspect ratio (same effect as generating an image with the same AR and importing that)
Motion (far right to far left - properly keyframed)

I take the view that having to messing around with the object's AR before applying the Motion effect is also a bug.

The auto scaling of the smaller image so that the smaller image width = the video width (height is therefore taller than the videos height) is more of a feature than a bug, but since that generates the "Letterbox to aspect ratio being required" issue, I think that this is also a bug.

I have previously tried Nat's Scale / Position but again find that this results in the clipping effect.

Is there a bug reporting route? I don't think that this is wholly down to my lack of familiarity with this product since we are arriving at the similar solutions.

borate

Using the precise resolutions/AR you specified for the images, both my method and Nat's were tested here in v7.32, which is the latest. In each case, the overlay moved smoothly from off-screen left to off-screen right. No clipping, no need for A/R effect.

For positioning, the image in the preview screen was dragged, not the circle base line in the sequence screen.

Test v7.32. If registered, keep your old installer on hand, though it's usually stored on the PC automatically. For licensed users upgrades are free for up to six months. After that, VP will continue to fully function but a fee will be required in order to register the newest.

During position manipulations the PV overlay image has a tendency to vanish, though the positioning box remains. That behavior may be a bug. Reported. You can do that as well by clicking on the chevron at the top-right of the VP window and choosing to Send Bug Report.