H264 export bitrate (quality) settings are too low
By default the H264 export settings produce a too low quality. My master (from the camera) is 2.2GB for 11 minutes. Default H264 export in the same resolution (1080p) is down to 150MB.
I can set a bitrate to 8000 in the (confusing) advanced setting which produce a 570MB file.
Since Pitivi is a video editor, the resulting output should by default be high quality. And it should provide easy to set quality options.