Fix ffmpeg_reader not selecting a default stream #2114
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fix #869 #899
ffmpeg, at least the version that's installed automatically with moviepy, sometimes comes up with no default stream for a given input file. This PR does nothing more than set a default stream automatically when none is specified, which is the cause of the missing "video_fps" issue.
Unfortunately I fixed this bug a long time ago in a working branch, and can't find the file that raised this problem in the first place. I think it was a ".wmv" or ".asf".