This video shows the new workflow for processing Magic Lantern HDR video with Ginger HDR inside After Effects and Premiere Pro. In the old version of the workflow you would convert the original files into a sequence of EXRs in a long, disk-space intensive process. With the new workflow, you create a little text file (with a GNR extension) that points to the original file.
You can then import that GNR file directly into After Effects and Premiere Pro. The Ginger HDR file format plugin will perform optical flow on-the-fly to merge frames as needed. So you don't have to worry about the details of blending the frames together and syncing it with audio -- the Ginger HDR plugin handles all of that for you. Once imported, you can perform HDR tonemapping on the video files.
Honestly, the plugin isn't as fast as I'd like it to be. It's not fully optimized yet, and it doesn't run on the GPU yet either. So if you switch the preview resolution to half resolution or lower the plugin will disable optical flow, and on my machine it runs around 7fps with a 720p frame.
In general, I'd recommend a workflow where you import your clips into After Effects, shorten the clip and perform HDR tonemapping, and export into color-corrected clips. Then import those clips into Premiere Pro.
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