Settings > Playback > Draft decoding (off by default): the Program monitor
asks for draft frames only while playing at 1/2 resolution or lower
(FrameKey::draft, filmcraft_media::cancel::with_draft). The GOP cache runs
the decoder in draft mode for those requests and serves draft frames to draft
requests only, so paused frames, renders and exports always get exact
pictures (codecs test: exports after draft playback match ffmpeg). Draft
plans hand the GPU box-decimated YUV planes at the drawn size. perf.stats
reports draft frames, H.264 threads and the preference; the bench gains
2160p quarter and draft playback cases.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
