T3i movies without sound

[glrothman]

I want to use my t3i for video with reference sound, but some of my test files have no sound at all. That is, I import to Adobe Premiere Pro and there's only a video component; no audio. 

On my last test, I played the file back on the camera and heard the audio. But when I took the SD card to my computer to load it in Premiere, it had no sound. Trying it in VLC, there's also no sound. 

This is intermittent -- some files have worked fine. 

Any theories?  

Thanks in advance!!

[Waddizzle]

Are you sure that you are copying the files properly from the SD card?  

You are copying the files from the card before you try to open them, right?

How old is your computer?  

[glrothman]

Yes, yes, and about 18 months.

Thanks...