# AV1 Opus Encoder (Go Port)

This is a Go port of the `av1_opus_encoder.py` script, designed to be compiled into a standalone executable.

## Pre-compiled Binaries

Pre-compiled binaries are available in the `bin` directory:

-   **Windows**: `bin/av1-encoder.exe`
-   **Linux**: `bin/av1-encoder-linux` (ensure you run `chmod +x bin/av1-encoder-linux` before executing)

## Prerequisites

- **Go 1.21+**: Required to compile the code.
- **External Tools**: The following tools must be in your system `PATH`:
  - `ffmpeg`
  - `ffprobe`
  - `mkvmerge`
  - `opusenc`
  - `mediainfo`
  - `av1an`
  - `HandBrakeCLI`
  - `ffmsindex`

## Building

1.  Open a terminal in this directory.
2.  Run `go mod tidy` to ensure dependencies are resolved (standard library only, but good practice).
3.  Build the executable:
    -   **Windows**: `go build -o av1-encoder.exe .`
    -   **Linux**: `go build -o av1-encoder .`

## Usage

Place the executable in the directory containing your `.mkv` files and run it.

```bash
./av1-encoder [flags]
```

### Flags

-   `--no-downmix`: Preserve original audio channel layout (default: false, downmixes >5.1 to stereo/5.1 based on logic).
-   `--autocrop`: Automatically detect and crop black bars (default: false).
-   `--speed`: Set SVT-AV1 preset (e.g., `slower`, `slow`, `medium`, `fast`).
-   `--quality`: Set SVT-AV1 quality (e.g., `medium`, `high`).
-   `--grain`: Set film-grain synthesis level (int).

## Moving to a New Git Repo

This directory is self-contained. You can move the entire `av1-go` folder to a new location and initialize a new git repository:

```bash
mv av1-go /path/to/new/location
cd /path/to/new/location
git init
git add .
git commit -m "Initial commit"
```