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VSE and border render incompatable
Closed, ResolvedPublic

Description

Leaving border select on while using the VSE results in either a garbled mess of a render, or crashing.

Blender version: 2.77a

Windows 10,
Intel Core i5-6300HQ @ 2.30Ghz
8.00 GB

To re-create the problem:

Open Blender,
Press Keypad 0 to select camera view,
Press Shift-B and drag a box to select a border render
Change the 3D view to the VSE editor
Add a video
Press 12 to render a frame, or click Render Animation
The image is a garbled mess.

Event Timeline

Ahhhh... a little more testing...

Starting from the end of the last set of instructions,

Set the video image/video output type to H.264
Pressing Render Animation now causes Blender to crash.

I think this may be due to the H.264 codec only working when it's dimensions are multiples of 8.

Sergey Sharybin (sergey) triaged this task as Confirmed, Medium priority.

Looked into the issue.

Unfortunately, it's not that trivial to make sequencer aware of the border rendering and the way how render result is fed from sequencer to the render result adds more complexity to this..

While corrupted renders and crashes are really bad, for now i'll add a code which prevents rendering with sequencer and border enabled at the same time.

Surely, making sequencer aware of border rendering will be really cool, but that'd happen as general development. Added a note about this to our TODO list: https://wiki.blender.org/index.php/Dev:Source/Development/Todo/Tools#Sequence_Editor