[FFmpeg-user] How do I increase the playback size of a video without rescaling it?

[Mark Filipak]

On 07/16/2020 01:39 PM, fowman wrote:
> Moritz Barsnick wrote
>> With every 1280x720 video? Or just this one?
> 
> Just this, but then it's the only one I have :-)
> 
>> I'm guessing the latter video is letterboxed, i.e. a large black box
>> around it is encoded in the video. If you can share, we could tell.
-snip-
> I realise that the original .ts video is actually letterboxed, although the
> vertical side bars are pretty narrow. I've always assumed that letterboxing
> referred to the top and bottom horizontal bars
-snip-

You are correct regarding letterbox. What you see, black areas top-bottom-left-right, is called 
"pillarbox".