perf(video): move tier scaling to ffmpeg

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
2026-11-04 10:52:35 -08:00
parent 76e8c22815
commit 6310f50c27
11 changed files with 93 additions and 47 deletions
@@ -1,11 +1,11 @@
 namespace ytLive.Services.Compositor;

 /// <summary>
-/// Where the compositor draws from (the active quality tier's output rect over the
-/// 1920×1080 master) and at what size. 16:9 tiers = the full master 1:1; the vertical
-/// 9:16 tier = the centered 607×1080 crop scaled up to 1080×1920. The source rect is
-/// integer-aligned — MainViewModel's <c>OutputRectX</c> can be 656.5, so the caller
-/// rounds before building these options.
+/// Where the compositor draws from (the active quality tier's crop over the
+/// 1920×1080 master) and the size of the BGRA frame it sends to the encoder. The
+/// compositor frame is the crop itself; FFmpeg scales it to the selected output
+/// dimensions. The source rect is integer-aligned — MainViewModel's
+/// <c>OutputRectX</c> can be 656.5, so the caller rounds before building these options.
 /// </summary>
 public sealed class CompositorOptions
 {