user39406: I'm writing a program to automate building of an ffmpeg command line.
One thing that is challenging me is that ffmpeg uses index numbers to identify the input sources.  It would be easier if there was a way I could name or label the input sources, which would make constructing -filter_complex arguments a whole lot easier.
Is there some way to name/label the inputs in ffmpeg?

user39406: Credit to @Gyan - the answer I was looking for, name each numbered input via the null filter:
These would go at the beginning of a filter_complex
[0]null[sourcevideo];[1]null[qrcode];[2]null[logo];


39406: <p>I'm writing a program to automate building of an ffmpeg command line.</p>
<p>One thing that is challenging me is that ffmpeg uses index numbers to identify the input sources.  It would be easier if there was a way I could name or label the input sources, which would make constructing -filter_complex arguments a whole lot easier.</p>
<p>Is there some way to name/label the inputs in ffmpeg?</p>
 39406: <p>Credit to @Gyan - the answer I was looking for, name each numbered input via the null filter:</p>
<p>These would go at the beginning of a filter_complex</p>
<pre><code>[0]null[sourcevideo];[1]null[qrcode];[2]null[logo];
</code></pre>
