Just to chat, I had to track a camera movement (by hand) other a footage. In Houdini, in the camera "view" tab, you can "Enable Background Image", pick an image sequence and voila. The file name for a sequence goes like this : "filename.$F5.jpg"
The thing is, each time I was keying the transform of the camera, the sequence was freezing into a single image, so for example if I keyed at frame 35, the file name in the file path changed into : "filename.00035.jpg" So each time I was keying I had to re-enter the file path. Took me two day to figure it out. If I "Alt click" in the path file name, it gets a key and then no longer change. In houdini, even expressions are keyframable !
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