Noob can't get VAAPI to work

services:
    ersatztv:
      image: jasongdove/ersatztv:latest-vaapi
      container_name: ersatztv
      security_opt:
        - no-new-privileges:true
      restart: "unless-stopped"
      networks:
        - default
      ports:
        - "8409:8409"
      volumes:
        - $DOCKERDIR/appdata/ersatztv:/config
        - $DATADIR/TV:/tv
        - $DATADIR/Movies:/movies
        - $DATADIR/YouTube:/youtube
        - "/etc/localtime:/etc/localtime:ro"
      environment:
        TZ: $TZ
        PUID: $PUID
        PGID: $PGID
      devices:
        - /dev/dri:/dev/dri

I didn't have the devices line originally, it added it to see if it would help (it didn't). I also tried /dev/dri/renderD128 instead and that didn't work.

You may have solved it! I've been stopping, starting, and restarting as i tweaked the yml file. i didn't recreate it. using down then up commands i now have:

Checking driver iHD device /dev/dri/card1

Trying display: drm
vainfo: VA-API version: 1.18 (libva 2.18.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 23.2.1 ()
vainfo: Supported config attributes per profile/entrypoint pair
VAProfileNone/VAEntrypointVideoProc
VAConfigAttribRTFormat : VA_RT_FORMAT_YUV420
VA_RT_FORMAT_YUV422
VA_RT_FORMAT_YUV444
VA_RT_FORMAT_YUV411
VA_RT_FORMAT_YUV400
VA_RT_FORMAT_RGB16
VA_RT_FORMAT_RGB32
VA_RT_FORMAT_RGBP

... (the output is very long)

Checking driver i965 device /dev/dri/card1

Trying display: drm

Checking driver i965 device /dev/dri/renderD128

Trying display: drm

Checking driver RadeonSI device /dev/dri/card1

Trying display: drm

Checking driver RadeonSI device /dev/dri/renderD128

Trying display: drm

Checking driver Nouveau device /dev/dri/card1

Trying display: drm

Checking driver Nouveau device /dev/dri/renderD128

Trying display: drm