Looks helpful! I assume ffmpeg needs to be built with SDL for this to work? I couldn't get it to work with my current minimal compile, but I don't think the board I'm working on has SDL, so might need to install that and recompile
That's correct, `ffmpeg` needs to be built with `SDL` (SDL2 really is what is used on all recent versions). When `ffmpeg` is built, and the dev files for SDL2 are present, ffmpeg's build configuration picks it up automatically and it will link against the library unless instructed otherwise by a configuration flag. When you run `ffmpeg` first lines usually show the configuration which it was built, so it might have hints as to what it was built with, but if you want to confirm what it was links against you can do a quick:
$ ldd `which ffmpeg`
And you should get the list of dynamic libraries your build is linked against. If SDL2 is indeed included, you should see a line starting with "libSDL2-2...".
If I remember correctly you should be able to output to the framebuffer even if there is no support for SDL2, you just have to change the previous line provided from using `-f opengl "hdmi output"` to `-pix_fmt bgra -f fbdev /dev/fb0`.
You can also use any other framebuffer device if present and you'd prefer it (e.g. /dev/fb1, /dev/fb2). Also, you might need something different to `bgra` on your board, but usually `ffmpeg` will drop a hint as to what.
eonpi|1 year ago
$ ldd `which ffmpeg`
And you should get the list of dynamic libraries your build is linked against. If SDL2 is indeed included, you should see a line starting with "libSDL2-2...".
If I remember correctly you should be able to output to the framebuffer even if there is no support for SDL2, you just have to change the previous line provided from using `-f opengl "hdmi output"` to `-pix_fmt bgra -f fbdev /dev/fb0`.
You can also use any other framebuffer device if present and you'd prefer it (e.g. /dev/fb1, /dev/fb2). Also, you might need something different to `bgra` on your board, but usually `ffmpeg` will drop a hint as to what.