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perf(video): move tier scaling to ffmpeg

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The frame pump now submits crop-sized BGRA frames; FFmpeg scales them to final tier dimensions. Bundled scaler benchmark: 300 608x1080 to 1080x1920 frames in 0.435s (scaler-only).

Reference: https://ffmpeg.org/ffmpeg-filters.html#scale-1
This commit is contained in:
gramps
2026-11-04 10:52:35 -08:00
parent 76e8c22815
commit 6310f50c27
11 changed files with 93 additions and 47 deletions
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Services/Compositor/SceneCompositor.cs
+4 -3
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@@ -6,10 +6,11 @@ using ytLive.Models;
namespace ytLive.Services.Compositor;
/// <summary>
/// The output compositor: renders a scene into the encoder's master frame (tightly-packed
/// The output compositor: renders a scene into the encoder's raw input frame (tightly-packed
/// BGRA8 <see cref="VideoFrame"/>) exactly as the XAML preview renders it, minus the
/// editing chrome (SelectionOverlay, DimRects, badge, placeholder). The preview stays the
/// editing view; this is the output view — see TASKS.md "Ship step 1 — Scene compositor".
/// editing chrome (SelectionOverlay, DimRects, badge, placeholder). FFmpeg scales that frame
/// to the selected output dimensions. The preview stays the editing view; this is the output
/// view — see TASKS.md "Ship step 1 — Scene compositor".
///
/// Frame sources are supplied by a <see cref="Func{SceneElement, VideoFrame}"/> resolver
/// (the caller maps webcam → DeviceId, images → AssetId, background → CaptureKey), keeping