Welcome to the forums.
If you have not applied the latest update to PPro then now would be a good time to do so. It may well correct the problem.
If not then it may be the quickest solution to convert them.
I already upgraded to 4.1 but that didn't help. I was hoping there was a solution within CS4 but I will try some conversion program. I see the STOIK video converter was recommended by some, but, of course, the free version does not support mp4.
I feel your pain, Craig!
I too am having MP4 troubles, importing MP4 footage from my Sanyo Xacti HD2000 into Prem. Pro CS4.1. I'm currently trying some transcoding alternatives, and recommend you download Media Coder HDV Edition, and run some tests with the evaluation version.
Here's the link: http://mediacoder.sourceforge.net/solutions/hdv.html
I'm heading intomy studio now to see the results of some transcoding tests I ran last night... I'll be sure to share the news (good and bad) in this thread if it's of interest to you!
I have been following your story too. It is fustrating when you can play the video fine in its original form but not import it and use it in CS4.
I have been trying Streamclip on my original mp4 files. First I tried export to AVI with the following results: They play fine in VLC and Windows but when I import them into Adobe they play real fast for the first 10 seconds then it goes to still frame for the rest of the clip length. Very odd. This is true for a variety of settings I tried.
Then I tried the export to DV. This works. The clips import corrrectly and they also do not require rendering in CS4. But the clips are in 720x480. This might end up being the way I go but still looking for a better solution.
This whole thing started when my AVCHD camera was stolen in Vietnam and all I had was the Sony T900 to shoot the video.
That is the correct way. Converting to DV AVI type2 is the only sensible solution.