Panel Videostream with transforms converted to webassembly

With Panel 0.14 it is now easy to convert data apps to webassembly. Panel has a VideoStream widget so I thought I would try combining that with scikit-image.

You can see the result below. Had not thought it to be this performant so I thought it might be useful to share here.

You can try the live app here. You can find the code here

It works in Chrome, but unfortunately scikit-image raises an out of memory error when loading the app in Firefox.

The performance of the server-based app is also pretty amazing. I can get +10fps out of the box including a round trip from my client in Denmark to a server in Amsterdam and back.


I’m working on adding the example to the Panel Gallery. Add Gallery VideoStream example by MarcSkovMadsen · Pull Request #4047 · holoviz/panel (

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