Mirroring transform rotated upside down (front camera)

[piv199]

Hi there,

Trying to adopt this library for video recording in the project, but face strange issue. As far as I researched the issues section, this problem with mirroring mode for front camera is still actual:

#49
#113

Basically for front camera it doesn't matter where and when you set nextLevel.mirroringMode = .off - it's not mirrored on previewLayer, but the resulting video is mirrored.

Proposed solution was to apply nextLevel.videoConfiguration.transform = .init(scaleX: -1, y: 1) which works fine for apple devices. But what I faced is not all video players understand the resulting video and it gets rotated upside down.
If we look into metadata, the recorded video will have:
Rotation: 180
SIDE DATA LIST

• Displaymatrix: 00000000: -65536 0 0 00000001: 0 65536 0 00000002: 0 0 1073741824
• Rotation: -180

If not applying transform, everything is zero and not rotated, but mirrored. Could there be any other solutions to get resulting video without any rotation metadata or mirroring for front camera?

[om-ha]

Refer to my comment here #113 (comment).