A few ffmpeg queries

[Mark Carroll]

On 08 Sep 2017, Vangelis forthnet wrote:

>  However, the GiP perl script must cater for a variety 
> of OSes and in the case of Linux distros some (still) 
> come by default with older FFmpeg packages; 

The script is unable to determine the version of my OpenBSD ffmpeg,
	ffmpeg version git-N-75412-g523da8eac1

I had hoped to suggest a patch but I don't find that this hex string
corresponds to a commit hash that appears at source.ffmpeg.org or suchlike
so I do not have a confident means of interpreting it. Fortunately the
problem is simply a warning that I can ignore.

-- Mark