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Video Sequence Editor cache not updating for scene strips
Open, Confirmed, MediumPublic

Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 398.11

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
Worked: 2.79

Short description of error
Not sure if I'm doing something wrong here, but the Video Sequence Editor is not updating scene strips when changes are made to the scene (like object/camera manipulation).
Whatever is cached before the change stays in memory. The only way to force the update I've found so far is to change the "Preview Shading".

The expected behavior is that any visual change made to the scene in the scene strip would be updated real-time without changing the Preview Shading every time.

This isn't the case in 2.79. For the most part, I found scene strips updating when I made changes to the scene. If it won't update for some reason, I'd toggle something that won't affect my scene (like "Show Grease Pencil" when I have no GP elements).
While even this wasn't ideal, at least I wasn't forced to change the strip visually to force the update, and it didn't need to be done every time.

If this isn't a bug but it's a settings issue, maybe the defaults need to be changed to make it work as expected.

Exact steps for others to reproduce the error

  1. Add a scene strip to the VSE.
  2. Playback the timeline in VSE.
  3. Do something to change the scene. (e.g. Add a new Cube, move the camera, etc.)
  4. Scrub the timeline in VSE, and you should find that wherever there is cache, the scene doesn't update.

Details

Type
Bug

Event Timeline

Germano Cavalcante (mano-wii) triaged this task as Confirmed, Medium priority.

Not sure if this is valid request. AFAIK this is near to impossible to implement.

Is there similar cache system(physics etc) which can detect such changes?
I could hook up sequencer cache on such system. Otherwise it would have to be manually hooked up on every single action, that can result in change of rendered image.

Another possibility would be to not use cache for scene strips by default.

If nothing else, if it would result in the expected behavior of live updates like in 2.79, then I think not using cache by default makes sense.

Is that how it worked in 2.79?

If nothing else, if it would result in the expected behavior of live updates like in 2.79, then I think not using cache by default makes sense.
Is that how it worked in 2.79?

In 2.79 the cache was there, but it wasn't "recycled", so technically the behavior would be the same in 2.79. The same goes for scene proxies in older versions - you have to manually remove old proxies to update them.

If there will be strips on top of scene strips, those would be cached though...