GlFilterGroup squeezes the video resolution

[Kalaman]

Hey, thanks for this awesome library!

When I use the CLFilterGroup class, the size of the recorded video changes. It looks like the video is getting a vertical squeeze. The mp4 file has the right resolution though.

When I use the GLFilters separately everything works fine and there is no squeezing.

EDIT: I've found out that this issue only occurs when you add > 1 CLFilter to CLFilterGroup.