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Progressive Rendering: generate video preview
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Having a video preview (at least of the first sample chunk) would improve usability of the progressive rendering, as only a list of linear EXR files isn't all that useful.

This would require correct conversion from the linear EXR files to the desired output colour space. Options to investigate are:

  • Use OpenColorIO's ocioconvert tool to convert the files, then feed to FFmpeg.
  • Use the Blender sequence editor to output PNG files in the correct colour space to feed to FFmpeg.
    • Open the job's blend file, duplicate the scene with 'copy settings only', fill the VSE with the EXR sequence, then render to PNG.
    • Create a new blend file, copy certain colour/OCIO-related settings (using BAT maybe?) from the original blend file, then fill the VSE with the EXR sequence and render to PNG.
  • Bake a LUT file from Blender's colour settings, and give that to FFmpeg to let it do the colour conversion.


To Do

Event Timeline

Sybren A. Stüvel (sybren) moved this task from Backlog to Shortlist on the Flamenco board.
Sybren A. Stüvel (sybren) triaged this task as Normal priority.

Output to JPEG would also be good enough (w.r.t. PNG).

Implemented as the 2nd option (open blend file, create scene, fill VSE, render) in 3371e5d, b3c620b, and a bunch of commits on the Worker