To control the video file size, you can adjust the video codec bitrate settings.

Evaer recorder for Skype use the “H.264/MPEG-4 AVC Codec” as the default video codec, that you can adjust the vaule “Bitrate” and “VBVMaxRate” on registry to reduce/increase the kbps.  See the below image.

control the recording Skype video bitrate

The key path at HKEY_CURRENT_USER\SOFTWARE\Evaer\h264 , you need to add two DWORD value to control the bitrate.