Hello Tom,
Thank you. I'd put myself at close-to-beginner stage, but I'm learning to get control. It's all good fun!
Both the
selection mask &
motion tracking mask tools are useful. They can both be adjusted by keyframes throughout the clip. My take on it, at this stage, is that the
selection mask is more useful when there's
limited or no movement in the field of selection & the
tracking mask is more appropriate for doing that - tracking motion.
Having said that, they can both be used to get the same effect.
From my (limited) playing around, I've found the
motion tracking mask easier to control when the
motion is predictable... like a boat travelling across the water or person walking across the shot. In the clip I used for the video above (I used the selection mask for that one), the trickiest bit was when the bird flicked its head suddenly at the end. Absolutely, without question, if there's NO movement - like a building or lake in a still shot (no pan or zoom) - using the
selection mask is the way to go.
Please take these comments as they are, rather than a definitive judgement or the "right" answer. I think the best thing to do is keep playing with the tools to see what works best in different circumstances.
PIX
PIX YouTube channel