Hi RipGroove -
Pepsiman's tutorial was made using PDR10, where the production options are organised a little differently.
You'll find MP4 listed under AVC H.264 (and others, but the H.264 one is probably what you're after).
When you're customising the profile, the first step is to rename the profile in PDR. Call it something like "3440x1440 21:9"
Once you modify the Profile.ini (as you have done), back in PDR you need to select your profile fro AVC H.264 > MP4 > Custom...
In theory, you should only get a 320x240 if that's the profile you select.
N.B. After you've made your custom profile DON'T click on the + button to check it. You will NOY find your custom 3440x1440 resolution listed in the dropdown!
Cheers - Tony
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