Dual Encoder Support - Implementation Complete ✅

Features Added

The transcoder now supports switching between two video encoders via the --encoder CLI option:

1. HEVC NVENC 10-bit (Default)

Command: --encoder nvenc or default (no flag needed)
Codec: hevc_nvenc
Preset: slow (high quality)
Bit Depth: 10-bit
Pixel Format: yuv420p10le
Use Case: Best quality archival format, suitable for Plex compatibility

2. AV1 NVENC 8-bit

Command: --encoder av1
Codec: av1_nvenc
Preset: p7 (high quality)
Bit Depth: 8-bit
Pixel Format: yuv420p
Use Case: Maximum file size reduction, modern playback devices

Usage Examples

# Default to HEVC NVENC 10-bit with smart resolution scaling
python main.py "C:\Videos\Movies"

# Force AV1 NVENC 8-bit encoding
python main.py "C:\Videos\TV" --encoder av1

# AV1 with explicit resolution
python main.py "C:\Videos\Anime" --encoder av1 --r 1080

# AV1 with CQ mode at specific quality
python main.py "C:\Videos\Low-Res" --encoder av1 --cq 28

# AV1 with bitrate mode
python main.py "C:\Videos\Movies" --encoder av1 --m bitrate

# HEVC (explicit, though it's the default)
python main.py "C:\Videos\TV" --encoder nvenc --cq 26

Configuration

Encoder settings are stored in config.xml:

<encoder default="nvenc">
  <av1_nvenc preset="p7" bit_depth="8" pix_fmt="yuv420p" />
  <hevc_nvenc preset="slow" bit_depth="10" pix_fmt="yuv420p10le" />
</encoder>

The default="nvenc" attribute can be changed, but CLI --encoder flag always takes precedence.

Files Modified

config.xml - Added <encoder> section with both encoder configurations
main.py - Added --encoder argument, defaults to "nvenc"
encode_engine.py - Updated run_ffmpeg() to:
- Accept encoder parameter
- Dynamically set encoder codec, preset, bit depth, and pixel format
- Display encoder details in logging output
process_manager.py - Updated to:
- Accept and pass encoder parameter through processing pipeline
- Updated both Phase 1 (initial encode) and Phase 2 (bitrate retry) encode calls

Quality Notes

Aspect	HEVC NVENC	AV1 NVENC
File Size	~80-90% of AV1	Smallest (baseline)
Quality	Excellent	Excellent
Preset	slow (p6)	p7
Bit Depth	10-bit	8-bit
Compatibility	Excellent (Plex)	Good (modern devices)
Encoding Speed	Fast	Fast

Both encoders use NVIDIA GPU acceleration (NVENC) for fast encoding.

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