How do I export videos with transparent background?

I was making this test while you guys answered to @Deeptanu_Dhar question:

A simple 3 tracks project with 2 images moving on top of a green background (track V1).

2021-03-09_07.44.58

I exported to the .mov format, following the method bellow.
Then used the exported clip on another project.

  • Image on track V1
  • My new .mov clip on track V2 (no filter applied)

2021-03-09_07.55.45

Result:
https://streamable.com/2xt522
https://streamable.com/2xt522 (If the Streamable preview doesn’t work, use this link)

Follow these steps:

  • Create a project with GREEN color clip on V1.
  • Save project.
  • Go to Timeline Menu > Other and choose Copy Timeline to Source
  • Apply Chroma Key: Simple filter on the Source video, with color set to the same green as in V1
  • Go to Export
  • Make sure Source is selected in the From dropdown menu
  • Choose alpha > Quicktime Animation in the Export Presets
  • Activate Advance mode.
  • The Format dropdown menu should be set to mov
  • In the Codec tab, the Codec dropdown should be set to qtrle
  • In the Audio tab, check Disable audio
  • In the Other tab, pix_fmt=argb should be present in the Other text box.
  • Click Export File.
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