From the log:
12:56:21.758: Output 'simple_stream': stopping
12:56:21.758: Output 'simple_stream': Total frames output: 21042 (23272 attempted)
12:56:21.758: Output 'simple_stream': Total drawn frames: 14000 (23324 attempted)
12:56:21.758: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 9324 (40.0%)
12:56:21.758: Output 'simple_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 2230 (9.6%)
Your GPU isn't able to render frames fast enough, meaning you need to either lower resolution or framerate. Looking at the number of sources in each scene it may also be that your scenes are too complex to be rendered in time for compression.
There are also a very large number of missing files included in scenes and JSON errors, indicating possibly corrupted scenes that could cause performance and stability problems.