Module video 

Video export module for the NES emulator CLI.

This module provides video encoding capabilities for exporting emulator frame buffers to various video formats.

Supported Formats

Format	Implementation	Dependencies
PNG sequence	Pure Rust (image crate)	None - self-contained
PPM sequence	Pure Rust	None - self-contained
MP4	FFmpeg subprocess	FFmpeg installed
Raw	Writes raw BGRA bytes	None

Scaling

Video scaling is handled natively by FFmpeg using the nearest neighbor filter, which preserves sharp pixel edges for retro games.

Structs

FfmpegMp4Encoder

Encoder that pipes frames to FFmpeg for MP4 encoding.

FpsConfig

Parsed FPS configuration.

PngSequenceEncoder

Encoder that outputs a sequence of PNG images.

PpmSequenceEncoder

Encoder that outputs a sequence of PPM images.

RawEncoder

Encoder that outputs raw BGRA frames.

StreamingVideoEncoder

A streaming video encoder that handles scaling via FFmpeg.

Enums

VideoError

Video encoding error

VideoResolution

Target video resolution for output.

Constants

NES_NTSC_FPS

NES NTSC framerate: 39375000 / 655171 ≈ 60.098814

NES_NTSC_FPS_DEN

NES_NTSC_FPS_NUM

NES NTSC framerate as exact numerator/denominator

SMOOTH_FPS

Smooth framerate target (exactly 60 fps)

Traits

VideoEncoder

Trait for video encoders.

Functions

create_encoder

Create a video encoder for the specified format.

create_encoder_with_scale

Create an MP4 encoder with FFmpeg native nearest-neighbor scaling.

encode_frames

Encode collected frames to video.

is_ffmpeg_available

Check if FFmpeg is available for MP4 encoding.