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

As found here, you have a few options:

1. concat protocol:

ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.ts

2. concat filter:

this one I don't fully understand, you probably need to look at all the diagrams and filter graphs, but it lets you deal with multiple formats and differing codec properties

    ffmpeg -i input1.mp4 -i input2.webm -i input3.mov \
-filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[outv][outa]" \
-map "[outv]" -map "[outa]" output.mkv

3. concat demuxer:

First, you need to generate a list file of some sort, eg. "mylist.txt"

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

Second, you need to run a command to use the list

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.wav