burn in caption to mp4

Thanks first of all for building the whole family of products.

To learn Membrane & friends, I want to build a simple Livebook-based tool that starts with a video and its webVTTs (multilingual), generate the image sequence (with Image or Typst), then burn the image sequence captions into the video.

Is Membrane, Live Compositor, or Boombox better suited for this purpose?
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