Converting mp4’s using QuickTime X

A client asked me to submit a cost estimate to produce a short video from a series of screen captures saved as mp4’s. When I attempted to convert the movies using QuickTime Pro 7, I was greeted with the following error message: “An invalid public movie atom was found in the movie.”

Invalid public movie atom error

I use OS X 10.6.8 to produce videos. On my Mac I’ve installed a couple of movie file converters, including ffmpegX and MPEG Streamclip – neither of which could open or convert the mp4’s. Compressor, which is installed with the Final Cut Pro suite, wouldn’t open the file, either. Searching online, I found a thread posted on an Apple Support Communities page that the error occurs because both QuickTime 7 and Compressor do not support 64-bit Times.

Rather than ask my client to redo the 800×600 screen captures (he uses a Windows PC), I opened the same movies using QuickTime Player 10, which is also installed on my machine. Sure enough, I found I could convert the files into 480p format (720p would have been overkill because of the screen capture dimensions) using the drop-down menu from the File > Save As screen.

QuickTime Player 10 Save As HD 480p


Leave a comment

Filed under Apple Software, Troubleshooting, Video

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.