[FFmpeg-user] ffplay, display subtitles

[Ted Park]

> Libraries:
> libxv-dev/stable,now 2:1.0.11-1 amd64 [installed]  --  X11 Video extension
> library (development headers)
> libsdl2-dev/stable,now 2.0.9+dfsg1-1 amd64 [installed]  --  Simple
> DirectMedia Layer development files
> libvdpau-dev/stable,now 1.1.1-10 amd64 [installed]  --  Video Decode and
> Presentation API for Unix (development files)
> libva-dev/stable,now 2.4.0-1 amd64 [installed] --  Video Acceleration (VA)
> API for Linux -- development files
> libfreetype6-dev/stablibvdpau-dev/stable,now 1.1.1-10 amd64 [installed]  --
> FreeType 2 font engine, development files

You need to get libass, and recompile.