When video out to file is enabled the remote video which is recorded is
not show on screen.
You can use this command line for file input and output:
monkeyrunner ./webrtc/examples/androidapp/start_loopback_stubbed_camera_saved_video_out.py --devname 02157df28cd47001 --videoin /storage/emulated/0/reference_video_1280x720_30fps.y4m --videoout /storage/emulated/0/output.y4m --videoout_width 1280 --videoout_height 720 --videooutsave /tmp/out.y4m
BUG=webrtc:6545
Review-Url: https://codereview.webrtc.org/2273573003
Cr-Commit-Position: refs/heads/master@{#14660}