[Libav-user] How to Demux mp4 to video/audio stream and Remux them back to mp4 using API?

[wucg]

Hi, I'm newbie to FFmpeg, could anyone tell how to demux a mp4 file to:
video stream:  .h264
audio stream: .aac
then remux them back using C/C++ API, not the command tools.

equivalent to command:
ffmpeg -i media\input.mp4 -vn -f aac media\output.aac
ffmpeg -i media\input.mp4 -an media\video_only.mp4
ffmpeg -i media\video_only.mp4 -i media\audio_only.aac  media\restore.mp4

Thanks a lot!
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