GPU Detection Enhancement and Documentation Improvements

[Generator]

Summary

Enhances GPU device permission detection and management in the container startup script, along with documentation improvements and cleanup.

Changes Made

1. GPU Detection for User abc

• Added automatic detection of GPU devices (/dev/dri, /dev/dvb, /dev/snd)
• Implemented permission checking for user abc
• Automatic group creation and membership management for video devices
• Handles group read/write permission fixes inside the container
• Copied the missing code from https://github.com/linuxserver/docker-ffmpeg/blob/master/root/ffmpegwrapper.sh#L37-L70

2. Removed Redundant Package

• Removed intel-media-va-driver-non-free from Dockerfile (already included in linuxserver/ffmpeg base image)

3. Docker Compose Improvements

• Added documented GPU options for NVIDIA and Intel GPUs
• Improved environment variable descriptions
• Cleaned up redundant comments and configuration

4. Documentation Cleanup

• Removed broken links to gwlsn/shrinkray (repo returns 404)
• Simplified README.md, removed redundant Intel Arc setup section
• Maintained credits in documentation

Testing

GPU	Driver	Hardware Encoders	Status
Intel HD Graphics 630 (iGPU)	Intel iHD	QuickSync + VAAPI	✅ Tested on headless system
AMD Radeon 610M	AMD VAAPI	VAAPI	✅ Tested

Intel GPU Support Details

• QuickSync (QSV): Hardware encoder available on Intel GPUs gen5+
• iHD Driver: Supports gen8+ (Intel HD 4000 and newer) - default for Intel
• i965 Driver: Supports gen5+ (Intel HD 3000 and newer) - for gen5-gen9.5 enable by setting LIBVA_DRIVER_NAME=i965 in docker environment variables
• Libva (VAAPI): Supports gen5+ with i965 driver and gen8+ with iHD driver

Docker Image

Test image available at: ghcr.io/generator/shrinkray:fix-vaapi

Files Modified

• Dockerfile - Removed redundant intel package
• README.md - Improved documentation, removed broken links
• docker-compose.dev.yml - Added GPU options documentation
• docker-compose.yml - Added NVIDIA options, cleaned up comments
• root/etc/s6-overlay/s6-rc.d/svc-shrinkray/run - Added GPU device permission handling for user abc