mp4 - MPEG-4 movies don't play

Hi, wonder if anyone has solutions for mp4 movies that won't open.

I have a dozen mp4 - MPEG -4 movie files of which some play and some don't. They all have the exact same extension in the 'kind' column, but some won't play at all and just come up with '...not in a format that QuickTime understands'. etc. Why would some be OK and others aren't.

Any ideas, and They won't play in VLC either?

Thanks

have looked at the get info between the two, and the one that doesn't play gives me nothing, under the 'more info', just when opened, but the working one gives that info

SpetsnaZ99 said:

You need a seperate app to view the real info of a file. Try this its free.
http://www.macupdate.com/app/mac/25921/videospec

Click to expand...

thanks

T'hain Esh Kelch said:

Try open them with VLC - it supports many more codecs than Quicktime do.

MP4 is just a container - It doesn't tell you exactly what kind of codec has been used to encode the movie itself.

Click to expand...

thanks, I did say up top VLC won't play them either, and I have Perian installed also