2.92 crashes when opening 2.83 files containing VSE strips created using Python API #85762

New Issue

Yann Lanthony · 2021-02-18T11:16:35+01:00

Yann Lanthony commented

2021-02-18 11:16:35 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.79

Blender Version
Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-17 17:55, hash: 3bb58e2a7c
Worked: 2.91

Short description of error
Blender 2.92 crashes when trying to open a 2.83 file containing VSE strips created using the Python API (e.g with sequence_editor.sequences.new_scene).
This seems related to the fact that in this case, the strip's transform and crop members are not initialized until used in 2.83.
Indeed, the crash happens in versioning_290.c within the seq_convert_transform_crop function which tries to access uninitialized strip->crop and strip->transform.

Exact steps for others to reproduce the error

Open Blender 2.83 (any minor version)
In a Console area, create a strip from a 3D scene
- C.scene.sequence_editor.sequences.new_scene("Strip", D.scenes.new("Scene2"), 1, 1)
Save this file
Try to open it in 2.92

A sample 2.83 file is attached to the ticket, to directly test step 4.
strip_crash.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.79 **Blender Version** Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-17 17:55, hash: `3bb58e2a7c` Worked: 2.91 **Short description of error** Blender 2.92 crashes when trying to open a 2.83 file containing VSE strips created using the Python API (e.g with `sequence_editor.sequences.new_scene`). This seems related to the fact that in this case, the strip's transform and crop members are not initialized until used in 2.83. Indeed, the crash happens in `versioning_290.c` within the `seq_convert_transform_crop` function which tries to access uninitialized strip->crop and strip->transform. **Exact steps for others to reproduce the error** 1. Open Blender 2.83 (any minor version) 2. In a Console area, create a strip from a 3D scene * ` C.scene.sequence_editor.sequences.new_scene("Strip", D.scenes.new("Scene2"), 1, 1)` 3. Save this file 4. Try to open it in 2.92 A sample 2.83 file is attached to the ticket, to directly test step 4. [strip_crash.blend](https://archive.blender.org/developer/F9814727/strip_crash.blend)

Yann Lanthony commented

2021-02-18 11:16:35 +01:00

Added subscriber: @yann-lty