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With this filter you will be able to do horizzontal and vertical panning.
With this filter you can do a multi-point panning over x and y axis. Simply you have to indicate the new video size and then one or more (up to 10)
x, y starting offset for a specified frame. In this document, the x and y offset for a specified frame is called point.
At least one point is mandatory, but using only one point you are performing a normal crop operation. If you use more then one point the filter work as:
1) Before the frame in the first active point the image is cropped using the x,y offset of the first point
2) After the frame in the last active point the image is cropped using the x,y offset of the last point
3) In the frames beetween first and last active point the x and y offset are setted performing a linear interpolation throught all active points.
You have up to 10 points, there is no need for the points to be actived in sequence because the filter before use them do a sort using the frame parameter as index.
Why this filter?
You can use this filter for rearrange short presentation or for perform a pan&scan conversion (16:9 -> 4:3) taking care of some sequence where the focus
of the action is gone because in the standard conversion the 4:3 area is fixed in the center.
Output height The new height.
Dedug mode With this unique feature, you will be able to see the output frame boxed in the original frame (see debug_mode.png). With this option you will be able to easly "cut" the image where you want (without be crazy with calculator).
Don't crop With this option enabled, only the offsets are computed, but the image will not be cropped.
Doing this you will be able to use severall istance of the filter increasing the numer of total points.
For example with two istance of the filter you can use up to 20 points.
Warning! With this option the frames before the first used frame and after the last used frame will not be computed:
you have to start from frame 0 and end with last video frame.
You have to perform the cropping manually on the last istance of the filter or using "null transformation" always AFTER the last istance of the filter.
Fill red, green and blue Change the color of the box in "debug mode".
Offset Y The offset Y.
Frame The frame where apply the offset X and Y.
Enabled Enable or disable the points, but at least one should be actived.
Natan Never 2000 (mail: nnever2000@yahoo.it)
September 3, 2007
Last revision: September 3, 2007
This filter was released under the GNU public license