Howto: join mp4 files

To join two or more mp4 video files you can use ffmpeg utility, just follow this simple steps:

1. convert mp4 to ts (transport stream) format

ffmpeg -i file.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts file1.ts

2. join several ts files into one mp4

ffmpeg -i "concat:file1.ts|file2.ts" -c copy -bsf:a aac_adtstoasc file12.mp4

•  conversion from other formats to mp4

ffmpeg -i fileOLD.webm -strict -2 fileNEW.mp4