I've been transcoding, using VLC for about a year, so I'm familiar with basic VLC
cmd-line syntax, etc, for using 'sfilter' and for changing audio and video codecs, etc.
But, I do NOT yet have familiarity with how to use VIDEO-filters, hence this posting.
Let's say I want to properly stretch a (movie) video, so that I purposely have some
black "letterbox" zones at top and bottom, and/or to end up with a specific aspect-ratio
(e.g. 16:9) for a movie that might NOT already be in that ratio.
Can someone either explain how to 'think' about this problem, or maybe better, just
illustrate with some cmd-line based snippets (that include some "vfilters") that
will accomplish that?
I've found some such example snippets here in the forum, but I haven't yet got
my head entirely around how to 'think', when it comes to choosing a "canvas"
size, etc, etc. (Maybe there's a VLC-specific tutorial somewhere that does
a decent job of explaining canvases and vfilters??)
Thanks in advance...