Attempting hevc (native) -> h264 (h264_omx) transcode automatically disables h264_mmal decode

[ikaruswill]

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Expected Behavior

hevc (native) -> h264 (h264_omx) transcodes should not automatically uncheck h264 hardware decoding.

Current Behavior

Transcoding a h264 -> h264 file right after enabling h264 hardware decoding works:

Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_mmal) -> h264 (h264_omx))
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))

However, after attempting a hevc (native) -> h264 (h264_omx) transcode:

Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_omx))
  Stream #0:1 -> #0:1 (opus (native) -> mp3 (libmp3lame))

h264 hardware decoding will be unchecked magically.

When trying the same h264 -> h264 transcode on the same file, we see this:

Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_omx))
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))

Steps to Reproduce

1. Enable h264 hardware decoding in Admin -> Playback -> OpenMax OMX
2. Play any HEVC file from a device that does not support Direct Play (Chrome browser)
3. Refresh Admin -> Playback -> OpenMax OMX
4. See that h264 hardware decoding becomes unchecked

Environment

OS: Raspbian (RPi4B 4GB)
CPU architecture: arm32
How docker service was installed: Running k3s on cri-o

Command used to create docker container (run/create/compose/screenshot)

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: jellyfin
  labels:
    app: jellyfin
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jellyfin
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: jellyfin
    spec:
      containers:
      - image: linuxserver/jellyfin:v10.5.5-ls52
        imagePullPolicy: IfNotPresent
        name: jellyfin
        env:
        - name: PUID
          value: '1000'
        - name: PGID
          value: '1000'
        - name: TZ
          value: Asia/Singapore
        ports:
        - name: http
          containerPort: 8096
        readinessProbe:
          tcpSocket:
            port: http
          failureThreshold: 1
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 2
        livenessProbe:
          tcpSocket:
            port: http
          failureThreshold: 3
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 2
        resources:
          requests:
            memory: 384Mi
            cpu: 500m
          limits:
            memory: 512Mi
            cpu: 2000m
        securityContext:
          privileged: true
        volumeMounts:
        - mountPath: /config
          name: config
        - mountPath: /data
          name: media
          readOnly: true
        - mountPath: /archive
          name: archive
          readOnly: true
        - mountPath: /opt/vc/lib
          name: omx-libs
          readOnly: true
        - mountPath: /dev/vcsm
          name: omx-vcsm
        - mountPath: /dev/vchiq
          name: omx-vchiq
        - mountPath: /dev/video10
          name: v4l2-video10
        - mountPath: /dev/video11
          name: v4l2-video11
        - mountPath: /dev/video12
          name: v4l2-video12
      nodeSelector:
        kubernetes.io/hostname: l1
      restartPolicy: Always
      volumes:
      - name: config
        hostPath:
          path: /mnt/flash/persistent/jellyfin
          type: Directory
      - name: media
        hostPath:
          path: /mnt/hdd
          type: Directory
      - name: archive
        persistentVolumeClaim:
          claimName: nfs-media-archive
      - name: omx-libs
        hostPath:
          path: /opt/vc/lib
          type: Directory
      - name: omx-vcsm
        hostPath:
          path: /dev/vcsm
      - name: omx-vchiq
        hostPath:
          path: /dev/vchiq
      - name: v4l2-video10
        hostPath:
          path: /dev/video10
      - name: v4l2-video11
        hostPath:
          path: /dev/video11
      - name: v4l2-video12
        hostPath:
          path: /dev/video12

Docker logs

Nothing in the logs reflects why it happens.

[aptalca]

That's an upstream issue and they seem to be aware: jellyfin/jellyfin-ffmpeg#29 (comment)
You can open an issue in the jellyfin repo if there isn't one already

[ikaruswill]

Thanks for getting back @aptalca. Will go ahead and check out that issue. Appreciate it.