IPhone – video resolution of iMovie app export in iPhone 4S

As part of Dive Into HTML5, Mark Pilgrim gives two options:

• Encoding Ogg Video With Firefogg
• Batch Encoding Ogg Video With ffmpeg2theora

One or both of those should work for you.

From iMovie, go to Share-> Export Using QuickTime. Set the Export: menu is set to Movie to MPEG-4. Click the Options... button next to that menu.

Set the File Format to MP4
Set the Video Format to H.264
Set the Data Rate to something like 2048
Set the Image Size to 1080
Click OK
Click Save

That should give you a much better-quality video.

Hope this helps!