I'm submitting this as a To Do because I'm guessing this is an incomplete feature.
System Information
Windows 7 Ultimate, 64-bit, 32GB, 5960x, Nvidia Quadro FX 1800 (Primary) & GeForce 9800 GTX+ (Secondary)
Graphics Tablet: Wacom Bamboo Model: CTF-430 Driver Version 5.2.4-5
VM
Ubuntu Linux (ubuntu-17.10-desktop-amd64) w/ Virtual Box Version 5.2.4 r119785 (Qt5.6.2))
Blender Version
Broken: (2.79)
Worked: (N/A)
Short description of error
Proxy render crash when building scene proxy.
Exact steps for others to reproduce the error
If you can't play the videos in your web browser, right-click the video --> copy link address (or equivalent) and play it in a media player like VLC.
blender-2.79.0 dbcc17 windows64
blender-2.79-40dbf2fc000
I managed to get the proxy rendered on my Lenovo T520 but my Lenovo X220 beeped when I started the proxy render:
Lenovo X220:
The folder structure blender outputs is... well see for yourself (Main System)
This is the result after multiple failed attempts at building a proxy at different resolution percentages (with overwrite enabled)
Proxy folder:
Blender File:
As mentioned before I'm not too sure is this is a bug or an incomplete feature.