Thread context.Context from main through watcher, encoder, and metadata
clients so a Ctrl-C during a multi-hour encode immediately kills the
ffmpeg/ffprobe/opusenc children instead of waiting for them to finish.
- main: signal.NotifyContext replaces the manual sigChan + done goroutine
- watcher.Start: takes ctx, exits on ctx.Done(); processFn signature is
now func(context.Context, string) error
- encoder: Transcode and every helper (extractAudio, encodeOpus,
encodeVideo, GetMediaInfo, GetStreamLanguages, calculateZscaleWidth)
take ctx; every exec.Command becomes exec.CommandContext so the child
is SIGKILL'd on cancel
- metadata: FetchMovieMetadata, FetchSeriesMetadata, fetchTVMazeJSON
take ctx and use http.NewRequestWithContext
Mover stays ctx-free intentionally: a rename is fast enough that
mid-cancel cleanup is the next-restart's problem. processFile's
deferred RemoveAll(workDir) and failToFailed still run after cancel,
so partial output dies in the work dir and the source moves to failed/.
Esa Kataja
459ab30d94