How to write a movie with video AND audio using AVAssetWriter?

Question

I want to export a movie with AVAssetWriter and can\'t figure out how to include video and audio tracks in sync. Exporting only video works fine, but when I add aud

Answer 1

It seams that assetWriterAudioInput ignores sample buffer time for audio writing. Do this way.

1) Write video track.

2) When done, mark it finished i.e. [videoWriterInput markAsFinished];

3) do [assetWriter startSessionAtSourceTime:timeRangeStart];

3) instantiate audio reader and start writing audio.