[FFmpeg-user] How to multiplex two videos with ffmpeg

[Carl Eugen Hoyos]

Stephan Asovski <s0527705277 <at> gmail.com> writes:

> I'm converting videos using the -s option for multiple 
> resulutions and I want to include a short intro at the 
> begining of the video. but for some reason it skips the 
> second `-i`

(I don't think it gets skipped, but -i file1 -i file2 
never meant "please concatenate file1 and file2.)

FFmpeg offers three possibilities to concatenate files:
http://ffmpeg.org/ffmpeg-all.html#concat-2
http://ffmpeg.org/ffmpeg-all.html#concat-1
http://ffmpeg.org/ffmpeg-all.html#concat-3

I don't think the concat protocol can work 
for mkv, please test demuxer or filter.

Carl Eugen