- Select the video file (mp4 only) using the
Select Videobutton. - Select the audio file (AAC only) using the
Select Audiobutton. - Press the save
Savebutton to save the new video file. The new video file will be saved in the root directory of the external storage, namedouput.mp4.
The app uses MediaMuxer from the Android API to mux the audio and video files together, and MediaExtractor to extract the audio and video data.
The result video file will be as long as the original video or audio file.