Hello,
I agree to be a codec issue, Since, Before installing the premiere Streamclip worked very well.
Streamclip I installed because I am starting to work with the Canon 5d mark ii to record image, The images are excellent! The Premiere does not support the type of video file from Canon transcoding is necessary.
What is strange is to reinstall premiere did not put back the premiere to work, Then I conclude it must be a codec own Windows???
Thanks
Paulo