Encoder Module (src/encoder.rs)

The Encoder struct handles the transformation of a binary file into a video stream.

Workflow

graph TD
    A[Input File] -->|Read Chunk| B[Buffer]
    B -->|Split| C[Data Shards]
    C -->|Reed-Solomon| D[Parity Shards]
    D -->|Merge| E[All Shards]
    E -->|Write Frame| F[FFmpeg Pipe]
    F -->|FFV1 Codec| G[Video File]

Key Components

1. FFmpeg Pipe

We spawn ffmpeg as a child process and pipe raw pixel data to its stdin.

let mut child = Command::new("ffmpeg")
    .args(&["-f", "rawvideo", ... "-i", "pipe:0", ...])
    .stdin(Stdio::piped())
    // ...

2. Reed-Solomon Encoding

We use reed-solomon-erasure to add redundancy.

• Data Shards: The actual file content.
• Parity Shards: Redundant data calculated from Data Shards.
• Recovery: If you lose valid data shards, you can replace them with parity shards to reconstruct the original data.

3. Block Scaling (write_frame)

To protect against compression (h264 re-encoding), we don't write single pixels. We write "blocks".

// Example: Block Size 4
// 1 Logical Bit -> 4x4 Pixel Area
for dy in 0..block_size {
    for dx in 0..block_size {
        // ... set pixel color ...
    }
}

This acts as a physical upscaling filter (Nearest Neighbor), making the "signal" significantly stronger against blurring.