[Help] Official Emby Theater RPi4 Image on Armbian: Choppy H.264, Missing v4l2m2m, Invisible Playback Overlay

[Modify3453 3]

I'm running into a frustrating combination of issues with the Official Emby Theater Raspberry Pi 4 image (Armbian). It seems to lack the necessary hardware acceleration stack, resulting in choppy playback and a missing playback Overlay.

Hardware:

• Raspberry Pi 4B (8GB)
• Storage: SD Card (Class 10) (32GB)
• OS: Armbian (Custom build based on the Emby Theater .img)
• Client: Emby Theater (Official RPi4 .img)

The Symptoms:

1. Choppy Playback: Standard H.264 1080p videos stutter in a very noticeable way.
2. Invisible UI Overlay: The "Now Playing" bar (controls, timeline, info) is completely invisible, though the video plays (albeit poorly).
3. Audio: Passthrough freezes video.

Troubleshooting & Findings:

I performed some diagnostics to isolate the issue:

• Driver Status: lsmod confirms that bcm2835_codec and bcm2835_v4l2 are loaded. The kernel sees the hardware.
• FFmpeg Capabilities (apt install required) Running ffmpeg -hwaccels returns:
  • vdpau, cuda, vaapi, drm, opencl
  • MISSING: v4l2m2m (The critical Raspberry Pi hardware decoder backend).
• Configuration:
  • Emby Hardware Acceleration is set to "Auto".
  • /boot/firmware/config.txt: dtparam=i2c_arm, i2s, and spi are commented out.
  • Audio output is set to "Auto"
  • All audio codecs unchecked for passthrough.
• Packages:
  • Attempted to install libraspberrypi-bin to get the missing userland libraries.
  • Error: libc6 version mismatch. My Armbian base is too new for the pre-compiled Pi libraries.
  • vcgencmd and rpi-firmware commands are not available.

The Core Question: Is the Official Emby Theater image for RPi4 either:

• Built on an older OS version that is incompatible with current Armbian kernels/libc6.
• Missing the proprietary firmware blobs and libraspberrypi libraries entirely.
• Relying on a ffmpeg build that wasn't compiled with --enable-v4l2m2m.

What I'm Looking For:

• Has anyone successfully patched the libc6 mismatch to get libraspberrypi working on a newer Armbian base?
• Is there a specific Armbian kernel version or config that enables v4l2m2m without needing the proprietary rpi-firmware package?
• Should I just abandon this image and switch to LibreELEC + Emby addon for a working experience?
• Is there an external player option that is reliable?

Any insight on how to force v4l2m2m detection or fix the invisible overlay would be appreciated!

[Luke 42255]

Hi, how did you install the app?