user6659: So I have multiple videos of the same scenery from different angles. These are stored as separate files. Can I combine these as multiple video streams within one file? 
For example I know this is possible with MKV, I just don't know how to "join" them.
Is this possible using ffmpeg? If so, which command sequence do I use?
If not, what other application would be able to do this?

user2178: Yes, this is possible using ffmpeg and the mkv container.
An example command sequence would be:
ffmpeg -i input1 -i input2 -c copy -map 0 -map 1 output.mkv

source
Breaking down the command:

-i input1 This selects the first input file. Could be something like my video_track1.mov.
-i input2 Here you can specify the second input file. You can add another entry -i input3 if you have more input videos. I don't know what the maximum amount of videos is you can place in one mkv container.
-c copy This copies all the streams (audio and video) in their original encoding.
-map 0 This maps all the streams (audio and video) of the first input file to the first track of the output file.
-map 1 This maps all the streams (audio and video) of the second input file to the second track of the output file.

More information on the -map option can be found in the documentation of ffmpeg.

6659: <p>So I have multiple videos of the same scenery from different angles. These are stored as separate files. Can I combine these as multiple video streams within one file? </p>

<p>For example I know this is possible with MKV, I just don't know how to "join" them.</p>

<p>Is this possible using <em>ffmpeg</em>? If so, which command sequence do I use?
If not, what other application would be able to do this?</p>
 2178: <p>Yes, this is possible using ffmpeg and the <code>mkv</code> container.</p>

<p>An example command sequence would be:</p>

<pre><code>ffmpeg -i input1 -i input2 -c copy -map 0 -map 1 output.mkv
</code></pre>

<p><sub><a href="http://ffmpeg.gusari.org/viewtopic.php?f=12&amp;t=828">source</a></sub></p>

<p>Breaking down the command:</p>

<ul>
<li><code>-i input1</code> This selects the first input file. Could be something like my <code>video_track1.mov</code>.</li>
<li><code>-i input2</code> Here you can specify the second input file. You can add another entry <code>-i input3</code> if you have more input videos. I don't know what the maximum amount of videos is you can place in one <code>mkv</code> container.</li>
<li><code>-c copy</code> This copies all the streams (audio and video) in their original encoding.</li>
<li><code>-map 0</code> This maps all the streams (audio and video) of the first input file to the first track of the output file.</li>
<li><code>-map 1</code> This maps all the streams (audio and video) of the second input file to the second track of the output file.</li>
</ul>

<p>More information on the <code>-map</code> option can be found <a href="http://ffmpeg.org/ffmpeg.html#Advanced-options">in the documentation of ffmpeg</a>.</p>
