I have created a number of videos in different 16X9 resolutions that are then uploaded to YouTube so they can be watched on the iPhone. All of the video I create is done on a computer. I don't actually use any film footage. It's all digital (screen share, webinars, After Affects projects, etc).
I have tried several resolutions like 1920X1080, 960X540, 640X360 and even the iPhone display resolution 480X320. I use the Quicktimes default preset (Web - High (Multi-pass)) which uses H.264 multi-pass video encoding at High Quality.
The videos look great on YouTube in very high quality. But when I view them through the YouTube app on my iPhone they look grainy and somewhat blurry.
I'm trying to figure out if I'm doing something wrong in the compression/video dimension arena or if the YouTube app on the iPhone simply doesn't keep the same high quality?
Does YouTube have to re-compress into a .mov container because the iPhone doesn't handle Flash? Are my video or export settings not optimal?
It's probably worth mentioning that I've only watched the videos on my phone through a 3G connection. I'll check WiFi tonight to see if that has anything to do with it.
I unfortunately don't have an example to share at this time as all of the videos I have so far have not been compliance approved yet by my company, so I can't make them public yet.