Appending one Video to another

The most simple way - same encoder settings

``` MovieCreator mc = new MovieCreator(); Movie video = mc.build(Channels.newChannel(AppendExample.class.getResourceAsStream("/count-video.mp4"))); Movie audio = mc.build(Channels.newChannel(AppendExample.class.getResourceAsStream("/count-english-audio.mp4")));

List videoTracks = video.getTracks(); video.setTracks(new LinkedList());

List audioTracks = audio.getTracks();

for (Track videoTrack : videoTracks) { video.addTrack(new AppendTrack(videoTrack, videoTrack)); } for (Track audioTrack : audioTracks) { video.addTrack(new AppendTrack(audioTrack, audioTrack)); }

IsoFile out = new DefaultMp4Builder().build(video); FileOutputStream fos = new FileOutputStream(new File(String.format("output.mp4"))); out.getBox(fos.getChannel()); fos.close(); ```

The AppendTrack initialization will fail if the Sample Description Boxes of the track arguments differ.

Different encoder settings - separate tracks (not implemented)

Another way to append two videos is to keep the media in separate tracks. All tracks will have different start times (via edit list box) timed in a way that track 'B' start it the moment track 'A' ends.

This will only work with quicktime since edit list boxes are not well supported in typical players.

Different encoder settings - special case H264 (not implemented)

the avcC Box contains to important decoder configurations:

• Sequence Parameter Set (SPS)
• Picture Parameter Set (PPS)

Each entry in each category contains an ID. Each GOP (??) references one of those entries. Two H264 tracks could be appended if their SPS & PPS contain different ID. Each reference can then stay as is and all SPS & PPS can be merged. A problem occurs if an ID is used twice with different settings. In the 'same id - different setting' case all samples referencing that particular SPS or PPS must be rewritten with a new ID (reference the newly created SPS entry with the new ID).