Another way to fix the widescreen - no re-encoding

I found this topic on Amazon: http://tinyurl.com/yjul4jv. I used it to shamelessly promote my blog, but he user Cactus has a great fix that doesn't re-encode your videos in case you want to use an editor that is MP4 compatible.

Here's his post:

TLDR:
Use MP4Box to losslessly fix the PAR flag on the MP4 files.
Use the ratios:
16:9 - 32:27
4:3 - 22:25

For example, if I have video file SDV_0004.MP4 that should be 16:9
MP4Box -par 1=32:27 SDV_0004.MP4

Long version:
Get MP4Box. Search the internet for it. To find the Mac version, search for MP4Box and the word Penguin. Copy all your movies over to your computer as MP4 files. Do NOT use any import wizards (like iMovie). Now copy MP4Box into the directory where the videos are stored. Use MP4Box to set the correct PAR flag.

I haven't tried it, so I don't know how hard it it to get done, but not re-encoding is always the best option.