ffmpeg: Combine/merge multiple mp4 videos not working, output only contains the first video

Question

Here is the command I am using to combine multiple videos:

ffmpeg -i 75_540_38HQ2.mp4 -i 76_70_20.mp4 -i 76_173_80.mp4 -i 81_186_35.mp4 -vcodec copy -acodec copy M         


        

Answer 1

MP4Box does work without breaking the audio. I did the following to obtain good results:

1. Download the latest Linux deb build from the gpac web site: http://gpac.wp.mines-telecom.fr/downloads/gpac-nightly-builds/

2. Use the -force-cat option

Sample command line:

MP4Box -force-cat -add in1.mp4 -cat in2.mp4 -cat in3.mp4 ... out.mp4

Some minor comments:

1. The above way is important, as the latest version of MP4Box distributed with Linux Mint 13 is buggy, and does result in corrupted audio.

2. -force-cat is important, as the video format tag was changed from AVC to avc3 without it.