1280x720 mp4 videos stop playing video after update, only sound works

this is what appears in the inspector:
h264, 1280QTKitMultiplicationSignWithSpaces720, Milhões
AAC, Estéreo (L R), 48,000 kHz
Only sound, no video anymore. It worked fine until the 9.1 iTunes update. Now I can only see the video with the VLC player.
I have another one that works fine(both sound and video) :
H.264, 960QTKitMultiplicationSignWithSpaces540, Milhões
AAC, Estéreo (L R), 44,100 kHz

Any help ? Thank you in advance. This happened after iTunes update.

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