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I just got a Hero3 and used it for the first time today. I left the settings as they came, video 1440/48w. I recorded a 3 minute section of trail, and when I play back the video it is not smooth watching it on a Mac and it's unwatchable on a pc. Both are playing it in quicktime. Please help :confused:
 

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I just purchased the same GoPro. I had the same problem. I had it uploaded to iPhoto and not iMovie. Once I put it into iMovie it was nice and smooth. Did you happen to do the same.
 

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GoPro used H.264 codec and depending on how fast your processor and drive speeds are, it can sometimes have a hard time playing and will skip. There are plenty of workarounds for this. Some players like Quicktime have a hard time decoding it while others like VLC (free player) do a better job.
Just dropping the .MP4 files into an editing program can have a hard time with H.264 (Mpeg 4, Layer 10) and you should use MPEG Streamclip (free), 5DtoRGB (free), or GoPro's Cinestream to convert them to a file that can work better with your editing application like iMovie, Final Cut Pro, etc.
If you need any more help, PM me.
My process is this...

Open in Quicktime 7 Pro
Select In and Out of what i want to use
Cut/Paste into a new file and Save.
Drop these new files into 5DtoRGB (I like this app the best but MPEG Streamclip and Cinestream work fine too)
Export out as ProRes LT.
Then use these files to edit with in Final Cut Pro. The file sizes are larger (5-6x as big)

Another suggestion if you want the best out of your GoPro HD3 is to shoot with ProTune ON, it has a 45Mbps bitrate.
 

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Try use AppGeeker video converter to make the file more friendly.

If you are running on a Mac, just drop the mp4 files into the program and convert to a QuickTime .mov file, then you can use it on your Mac, iMovie, FCP, etc.

See: How to Convert MOV to MP4 (or MP4 to MOV) for Mac/ Windows

For a Windows, convert them and output .wmv file format.

I've been using it to convert for many years, its easy to control and well rounded for everything you want to decode. very stable.
 
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