Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.48
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-29 21:12, hash: rBf28e59bd742e
Short description of error
blender crashes every time while switching camera in animation rendering , crash occurs only when motion blur option is on in eevee render settings.
Exact steps for others to reproduce the error
step 1 - place two or more camera in scene
step 2 - place marker in timeline and bind camera to markers
step 3- enable motion blur in eevee render settings
step 4 - select file format as FFmpeg video for animation
step 5 - start animation
result - crash while rendering frame reaches second camera in timeline.
here is a .blend file ( example file has crane camera but i also checked with normal camera )