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

[Edward Park]

Hi,

> On Jul 16, 2020, at 08:39, Moritz Barsnick <barsnick at gmx.net> wrote:
> 
> On Thu, Jul 16, 2020 at 07:22:39 -0500, fowman wrote:
>> No, I have the same on all three.
> 
> Ah, okay. *All* you players are able to scale the 720x576 video to
> fullscreen (automatically?), and *NONE* of them manages that with the
> 1280x720 video? That seems very unlikely. With every 1280x720 video? Or
> just this one?
> 
> 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.
> 
> If not, I know of no such property which would prevent such a video
> from being scaled. Generally speaking, all these players should somehow
> decode into a framebuffer, and then scale that, regardless of what the
> original video file says.
> 
> Moritz

I don't know if they are not used in all players but MP4 file format can contain the "clean-aperture" region info as well as matrices to specify sample transformations before the presentation should be displayed by default. 

Regards,
Ted Park