I have a MacBookPro Retina 13". It is New.
I have just bought LR4.
I have MP4 files that I can clearly and simply see on my laptop using VLC.
I can't import them to LR4.
How can I solve the problem?
Where did the MP4 files come from?
Lightroom can import mp4 files, but the mpeg wrapper could have a myriad of codecs in them that Lightroom may be having difficulty with.
Here are some things to try: http://helpx.adobe.com/lightroom/kb/troubleshoot-video-issues-lightroo m-4.html#main_Troubleshoot_Video_issues
Also, have you updated to Lightroom 4.3 yet?