Now printing less output from compare_videos.py.
Now printing less output from compare_videos.py.

Alternative solution to the one in
https://codereview.chromium.org/114003006/.

I considered adding a verbose flag, but it needs to be passed through
like 5 functions, so I didn't think it was worth it for a function of
such speculative use.

BUG=chromium:327990
R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/6679004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@5347 4adac7df-926f-26a2-2b94-8c16560cd09d

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