id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1723	Stream selection doesn't check the existence of the stream	burek		"Summary of the bug:

When the stream selection is used in such a way that it selects a non-existing stream, ffmpeg doesn't show any warnings or errors, but rather chooses to ignore the issue completely.

For example, if our input contains 2 video streams and we try to select a non-existent video stream like ""-c:v:333"" it will not complain, but IMHO it should, because if a user has specified a command line option for something, it means he wants that option to be taken into account. The least ffmpeg could do is issue a warning saying it is a non-existent stream selected.

How to reproduce:
{{{
% ffmpeg -i input -c:v:333 copy output
}}}
Instead of getting an error, warning or something like this:
{{{
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
}}}
the result is the same as if ""-c:v:333 copy"" was deleted from cmd line, thus ignored totally, using some default encoder like this:
{{{
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
}}}
"	defect	new	normal	undetermined	unspecified						0	0