tracing a mask path

[Veronika Yurchenko]

Hello,

There's something i need to make and I can't work out how to do it.

I have a footage of some paint dripping. I was able to delete the background so its footage on transparent.

I need to create a mask path around the silhouette. So basically autotrace, but not just one frame- for a 4 second footage.

Does this exist?

I tried tracking the mask and it hasn't worked well and also tried rotobrush and that doesnt work either.

Any other solutions would be highly appreciated!

[Rick Gerard]

Do you need an actual vector path or can you use a track matte? I have a lot of paint splatter, ink drip, and paint trip stock footage that I use all the time as luma track mattes for other footage. 

A more detailed workflow description and your design goals would help us help you.

[Mylenium]

I concur with Rick - tell us, what you are actually trying to do and we will advise. Auto-trace is probably a terrible idea, anyway. It creates unnecessarily complex masks that are terrible to work with and thus often aren't much use. Other techniques are often better.

Mylenium

[Warren Heaton]

Yes, you can auto-trace more than one frame by setting Auto-trace to use the Work Area (Layer > Auto-trace...).  In this case, set the Work Area to the 4-second range of footage that you want to trace.