[MPlayer-users] BUG: input source 4K ouput Full HD

[Reimar Döffinger]

On Fri, Dec 21, 2018 at 10:07:21PM +0100, Phil Forneur wrote:
> Hi,
>
> *codec of source video*:
> Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
> bt2020nc/bt2020/bt709), *3840x2160*, 48107 kb/s, SAR 1:1 DAR 16:9, 29.97
> fps, 30 tbr, 90k tbn, 180k tbc (default)
>
> *OS *win10 64bits
>
> When I play this 4K video with either SMPlayer 18.10 (64bits) or VLC 3.0.4
> AND I output on a *full HD*(1920x1080 at 60Hz) it does show a very poor image
> quality; note that this does not happen with windows media player.

For the record:
Video downscalers in the GPU might have bad quality.
-vo gl and some of its scaling mode options might help.