There is not much to go on here. Could be anything from your render settings not delivering a file that will play back smoothly to something going on in your composition or sequence settings. I need some details to come up with a clue.
You have not provided any exact render settings, comp settings, sequence settings or details about the source footage properties nor any system or version info. Nobody can help you on generalized and at best vague statments.
Comp is 8GB ram, i5, windows 8.
- Audio Mono: 44.100 kHz
- 2.97 fps
Anything else you to know just ask?
All I edited was put in some text at the start and at the end of the video. The original video was recorded on an iPad air, and the original file has no issues with audio and video sync.
I'm assuming 29.97 fps not 2.97 fps...
What version of AE? How did you render, AME or Render Cue? If you used the Quciktime h.264 container that could be the source of your problem. Apple stopped development of that format and it's about the worst choice you can make for rendering.
Try using the Adobe Media Encoder and one of the standard Vimeo or YouTube h.264 presets.
The thing is, in premier pro when I preview it without render, the audio and video are out of sync and I don't know why? I think there is a problem rooted in all of this which is occuring before the render.
Does the ipad record at variable frame rate, I know the iphone does. Premiere will not work with this variable footage, I expect AFX is the same.
Try loading the original footage into the Adobe Media Encoder and then pick a lossless or production codec to render a DI (digital intermediate) QuickTime Jpeg with quality set to high works well.
This doesn't help you much now but may help in the future. When I do production with my iPhone or iPad, and yes I use them in productions all the time, I use Filmic Pro and set the data rate to the highest and lock the frame rate. FiLMiC Pro on the App Store on iTunes
I've never had a problem with footage from that app. I have not really had a problem with regular footage either, but I have not used straight footage from the iPhone Camera app very often.