Quicktime videos play with no sound ,no video after 2013 uppdate

i recently had the great idea to uppdate my phone and after backing up all my files to my IMAC.
So now I cant 's watch my videos anymore.
the videos play in quicktime without sound and image-
All the pictures are fine but the mov files are there but can't play any more.
I have mac os installed and apple support told me to install mavericks and if this does not work to call them again.
I have been trying to find the answer to this for many weeks already.
i just do not understand what happened.
i also can not see them with vlc software or media player
The questions is:
what did really happened?
Are this files corrupted?
Is there any way to fix it?
I hope you can help me,thank you!

One of these:
H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per sec., Low-Complexity version of the H.264 Baseline Profile with AAC-LC audio up to 160 Kbps, 48 kHz, stereo audio in .m4v, .mp4, and .mov file formats;
MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per sec., Simple Profile with AAC-LC audio up to 160 Kbps, 48 kHz, stereo audio in .m4v, .mp4, and .mov file formats

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Quicktime videos play with no sound ,no video after 2013 uppdate

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