video recording and playingo

Hi,

First of all, what is your capturing process??

Is it something like storing live feed / raw frames (YUV) in to a file? Or Is it like storing in a file after encoding frames into some other encoded format?

If it is the first one,
Your phone's realplayer or some other video player doesn't support playing YUV frames. you have to encode it and try to play with standard player. If you just want to check the output, you can take the yuv file in pc and try to play in some yuv player

If your capturing is doing encoding already, file format is the problem. you need to write those encoded frame in 3gp file format(not sure, there can be some striaght forward file formats) and then try to play.

I think you should explain more clearly exactly *what* problems you are getting. What did you try (which classes, which approach, etc.), and what did not work the way you expected it to work?

It might also help to give a short description of you aim: What is it good for, in your case, to record something, but play something else at the same time? Looks like a rather special use case to me that may well be unsupported, or at least never tried.