From the log info I can say that the video card fails right at the end of the previous recording. Likely, there is nothing useful was written after.
Code:
...
08:08:41.549: ==== Recording Stop ================================================
08:38:05.245: device_resize_internal (D3D11): Failed to resize swap buffers (887A0005)
08:38:05.245: Device Removed Reason: 887A0005
08:38:05.245: device_draw (D3D11): texture is not a render target
08:38:05.245: device_draw (D3D11): texture is not a render target
08:38:05.247: device_resize_internal (D3D11): Failed to resize swap buffers (887A0005)
08:38:05.247: Device Removed Reason: 887A0005
08:38:09.972: encoder 'simple_video_recording': Cannot apply a new video_t object while the encoder is active
...
Device "removing" event may be indication of driver or HW failure (power loss or malfunction). Incorrect behavior of the device was detected by OS, so device was restarted (usually, for video cards, the screen blinks at this moment).