Render Animation in Video Editor doesn't warn that source video files are missing #98477
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Reference: blender/blender#98477
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System Information
Operating system: Fedora 35
Graphics card:
Blender Version
Broken: 2.90.1
Worked: (newest version of Blender that worked as expected)
Short description of error
This is more of a feature request / usability improvement than a bug.
I spent quite a few hours trying to figure out why a segment of a video from a Video Editing project was rendered all black. The segment looked fine in the video editor. It turns out that I had created a proxy for the video, then I accidentally deleted the non-proxy version of the video.
It would have been very helpful for Blender to open a dialog saying something like, "Source video file foo.mp4 missing." It would have saved me literally hours.
Exact steps for others to reproduce the error
Added subscriber: @ianromanick
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Confirmed'
Since all files are loaded on demand, on only thing that could be done is to produce warning after rendering. I could create state check to communicate such event to render job, perhaps it would be simple to report warning per file or strip.
Do you think this would help?
Added subscriber: @tintwotin
@iss When the scene is deleted of a scene strip, the strip gets a red line. This should happen to all strip types when the source is gone missing, and currently it doesn't.
@iss I think there are couple of things that we can do that fits into the design:
Do similar check to the invalid drivers. The validness of driver is only known after its evaluation attempt, and there is some code that makes it visible in the interface. Tricky part could be to do it in some thread-safe manner, as the rendering happens from a non-active dependency graph.
Collect the errors like missing source, and
BKE_reportthem at the end of render.This is not necessarily a bug, but something that we need to look into (hence should not be stayed as an unclassified report, and is not really a known limitation).
I'll let you and @fsiddi to agree on whether you think it is a bug, or a TODO for some some later point in the project.
This is a TODO. I suggest to visually highlight strips that have missing footage in the timeline, and display a warning sign in the preview and render. This would be similar to the "missing texture" behavior.