FFmpeg Concatenate Wiki的很清楚
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output (*.mp4/*.mkv)
On Windows Command-line:
(for %i in (*.wav) do @echo file '%i') > mylist.txt
Or for Windows bat-file:
(for %%i in (*.wav) do @echo file '%%i') > mylist.txt