how to convert data to mp4 format

in my apps im able downloaded a short video file from my server us开发者_开发知识库ing NSURLConnection but the data i received is in data format which cannot be played using MPMoviePlayerViewController. My question is: it is possible to convert NSdata to mp4 file? and how do i play it using MPMoviePlayerViewController. would really appreciate some code snippets cos i'm at a lost. Thanks in advance.

Look at AVAssetWriter. This allows you to encode image frames and audio into a MOV or MP4 file using hardware-accelerated methods where possible.