[FFmpeg-user] Joining 2 m4v video files

[Moritz Barsnick]

On Tue, Mar 01, 2016 at 14:13:18 -0700, jd1008 wrote:
> Do the messages below (from ffmpeg)  indicateproblems with the input?

What are you trying to achieve?

> Stream mapping:
>    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
>    Stream #0:1 -> #0:1 (aac (native) -> aac (native))

You're only using the first input file. If what you're trying to do is
to put the two video (and two audio) streams in parallel into the
output file, you need to also map the second input file:
$ ... -map 0 -map 1 ...

Moritz