As a separate from the other issue as it is clearly a different problem. I built the FBCapture.dll from the master branch using Visual Studio 2015 and the 4 linked .lib libraries.
No matter what settings I am using, I am unable to get any video recording. Neither in 2D nor 3D.
[ 2017-12-27 21:39:47 ][LOG]: Folder is already existed
[ 2017-12-27 21:39:47 ][LOG]: Added metadata for 360 recognition in FB
[ 2017-12-27 21:39:47 ][LOG]: Succeeded screen capture
[ 2017-12-27 21:39:47 ][LOG]: Screenshot has successfully finished
[ 2017-12-27 21:39:56 ][LOG]: Added metadata for 360 recognition in FB
[ 2017-12-27 21:39:56 ][LOG]: Succeeded screen capture
[ 2017-12-27 21:39:56 ][LOG]: Screenshot has successfully finished
[ 2017-12-27 21:40:02 ][LOG]: Added metadata for 360 recognition in FB
[ 2017-12-27 21:40:02 ][LOG]: Succeeded screen capture
[ 2017-12-27 21:40:02 ][LOG]: Screenshot has successfully finished
[ 2017-12-27 21:40:04 ][LOG]: Folder is already existed
[ 2017-12-27 21:40:04 ][LOG]: Video Codec info: NV_ENC_H264
[ 2017-12-27 21:40:04 ][LOG]: Bitrate:: 500000
[ 2017-12-27 21:40:04 ][LOG]: Device type: DirectX 11
[ 2017-12-27 21:40:04 ][LOG]: Set encode configurations successfully
[ 2017-12-27 21:40:04 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 21:40:04 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 21:40:04 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 21:40:04 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 21:40:04 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 21:40:04 ][ERROR]: Unexpected output channel count, expected stereo
[ 2017-12-27 21:40:04 ][ERROR]: Failed to start output audio client
[ 2017-12-27 21:41:47 ][LOG]: Folder is already existed
[ 2017-12-27 21:41:47 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 21:41:47 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 21:41:47 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 21:41:47 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 21:41:47 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 21:41:47 ][ERROR]: Unexpected output channel count, expected stereo
[ 2017-12-27 21:41:47 ][ERROR]: Failed to start output audio client
[ 2017-12-27 21:45:37 ][LOG]: Folder is already existed
[ 2017-12-27 21:45:37 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 21:45:37 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 21:45:37 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 21:45:37 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 21:45:37 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 21:45:37 ][LOG]: Silent status without any audio
... very often the same log ...
[ 2017-12-27 21:45:48 ][LOG]: Silent status without any audio
[ 2017-12-27 21:45:48 ][ERROR]: Muxing failed, error: : 203
[ 2017-12-27 21:50:51 ][LOG]: Folder is already existed
[ 2017-12-27 21:50:51 ][LOG]: Video Codec info: NV_ENC_H264
[ 2017-12-27 21:50:51 ][LOG]: Bitrate:: 500000
[ 2017-12-27 21:50:51 ][LOG]: Device type: DirectX 11
[ 2017-12-27 21:50:51 ][LOG]: Set encode configurations successfully
[ 2017-12-27 21:50:51 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 21:50:51 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 21:50:51 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 21:50:51 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 21:50:51 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 21:50:51 ][ERROR]: Unexpected output channel count, expected stereo
[ 2017-12-27 21:50:51 ][ERROR]: Failed to start output audio client
[ 2017-12-27 21:55:02 ][LOG]: Folder is already existed
[ 2017-12-27 21:55:02 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 21:55:02 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 21:55:02 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 21:55:02 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 21:55:02 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 21:55:02 ][ERROR]: Unexpected output channel count, expected stereo
[ 2017-12-27 21:55:02 ][ERROR]: Failed to start output audio client
[ 2017-12-27 22:00:35 ][LOG]: Folder is already existed
[ 2017-12-27 22:00:35 ][ERROR]: Invalid render texture pointer(null)
[ 2017-12-27 22:00:36 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Microphone)
[ 2017-12-27 22:00:36 ][LOG]: Audio device name: : Lautsprecher (Steam Streaming Speakers)
[ 2017-12-27 22:00:36 ][LOG]: Audio device name: : Lautsprecher (Creative SB X-Fi)
[ 2017-12-27 22:00:36 ][LOG]: Audio device name: : SPDIF Out (Creative SB X-Fi)
[ 2017-12-27 22:00:36 ][LOG]: Can't find Rift audio device. Just try to use default audio device
[ 2017-12-27 22:00:36 ][ERROR]: Failed to create audio file
[ 2017-12-27 22:00:36 ][ERROR]: Unexpected output channel count, expected stereo
[ 2017-12-27 22:00:36 ][ERROR]: Failed to start output audio client