Video call: video preview not horizontally flipped

[robertfromont]

Description

When making a video call, the video preview (i.e. my view of myself) is not horizontally flipped.
The UX is uncomfortable, because the preview doesn't act like a mirror.

Steps to reproduce

• Start a video call (in my case, to the Android Riot app)
• Look at the video preview of yourself

I expect the video to be horizontally flipped, as though looking in a mirror, but the image is 'right way round'.

Logs being sent: no

e.g. in the following screenshot, the text in the preview should be in mirror-imaged 'looking glass' text, but it's not.

Version information

• Platform: web (in-browser)

For the web app:

• Browser: Firefox version 68.0.2 (64-bit)
• OS: macOS
• URL: Private server hosted by modular.im, version info:
  matrix-react-sdk version:
  riot-web version: 1.3.2
  olm version: 3.1.0

[t3chguy]

This is configurable: