[Thread title changed for clarity.]
I'm using the trial version of Premiere Pro CC. I'm used to working with Premiere Pro CS5 maybe this is why I have such difficulty running the app. I'm sorry in advance for my english, I'm french.
My computer is a Mac HD, OS X, 10.8.4
I started by creating a new project, Timecode, Audio Samples, DV. Then when I import videos (MP4), when I open one in the source (preview mode) when I press play, the clip isn't playing. Same thing if I create a a new sequence by dragging a clip in the sequence button, the clip isn't playing when I press play either.
I hope this message is more clear than my previous one,
What is inside your MP4 file?
Wrapper Codec & Format, with 2 links inside to read-read both links in reply #1 http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing