Module media 

Media engine v0.1: video + audio via ffmpeg (external process).

• probe shells out to ffprobe and maps the result into MediaInfo.
• plan is pure bitrate budgeting → an EncodePlan (tested without ffmpeg). plan dispatches on media kind: two-pass video vs single-pass audio.
• run executes the plan: encode, size verification and (for video) a single correction retry on overshoot.

Structs

MediaEngine

The ffmpeg engine for video and audio.

Enums

PassKind

Which pass of the encode a progress update belongs to.