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

Concat demuxer

The concat demuxer was added to ffmpeg 1.1. If your version of ffmpeg is to old, get the newest static binary from here: http://www.ffmpeg.org/download.html

Instructions

Create a file mylist.txt with all the files you want to have concatenated in the following form (Lines starting with a dash are ignored):

# this is a comment
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

Note that these can be either relative or absolute paths. Then you can encode your files with:

ffmpeg -f concat -i mylist.txt -c copy output

It is possible to generate this list file with a bash for loop, or using printf. Either one of the following would generate a list file containing every *.wav in the working directory:

for f in ./*.wav; do echo "file '$f'" >> mylist.txt; done
printf "file '%s'\n" ./*.wav > mylist.txt

Source: ffmpeg wiki