Iphoto 9.5.1 shows mpeg-4 files as a thumbnail, but will only show as a black screen when you double click on it, other video files are able to be played and are viewable.  Why?

iphoto 9.5.1 shows mpeg-4 video files as a thumbnail, but will not play the video.  When try to play video it shows as a black screen.  Other video files play ok- (mpeg, .mov).  What do I have to do to view them?   If I use imovie they will play, but I sometime like to view them in iphoto.  It worked before I upgraded to 9.5.1 and 19.9.2 of the operationg system.

Select the thrumbnail of one of the videos and use the File ➙ Reveal in Finder ➙ Original menu option.  That should take you to the original mpeg4 file. 
If it does then try the following:
1 - launch iPhoto with the Command+Option keys held down and rebuild the library.
2 - Run Option #4, Rebuild Database, followed by Option #1 if needed.
OT

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