I'd like to output two .mp4 videos, one with RGB and the other with alpha, from an EXR sequence. How is that done in Adobe Media Encoder?
(As a followup, is it possible to select any alternate planes of the EXR such as depth or object ID?)
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Unfortunately, Adobe Media Encoder doesn't have an option to image sequences.
As such, you'll have to load the image sequence in Premiere Pro or After Effects first, insert it into a Sequence or a Comp, and then send that to AME.
Send the Sequence or Composition to AME.
In the AME Queue tab, click the Add Output button after you've set your Format and Preset for H264 and then click the name of the preset for the second output to open the Export Settings dialog box.
In the Export Settings dialog box, enable Render Alpha Channel Only and then click OK.
Set the Output File options as needed and then start the queue.
PR and AE should both see the RGB and the alpha of the EXR files as expected. You'll need ProEXR for AE if you want complete access to the EXR file (there may be extra channels beyond RGBA).