Since I always forget how to do this, here it is for future me; and you! 😉
1. concat video filter
Use this method if your inputs do not have the same parameters (width, height, etc), or are not the same formats/codecs, or if you want to perform any filtering.
Note that this method performs a re-encode of all inputs. If you want to avoid the re-encode, you could re-encode just the inputs that don’t match so they share the same codec and other parameters, then use the concat demuxer to avoid re-encoding everything.
ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv \ -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] \ concat=n=3:v=1:a=1 [v] [a]" \ -map "[v]" -map "[a]" output.mkv
2. concat demuxer
Use this method when you want to avoid a re-encode and your format does not support file-level concatenation (most files used by general users do not support file-level concatenation).
$ cat mylist.txt file '/path/to/file1' file '/path/to/file2' file '/path/to/file3' $ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4
(echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4
3. concat protocol
Use this method with formats that support file-level concatenation (
DV). Do not use with
ffmpeg -i "concat:input1|input2" -codec copy output.mkv
This method does not work for many formats, including
MP4, due to the nature of these formats and the simplistic concatenation performed by this method.
If in doubt about which method to use, try the concat demuxer.
Also see FFmpeg FAQ: How can I join video files? FFmpeg Wiki: How to concatenate (join, merge) media files