refactor: unify media understanding pipeline

src/media-understanding/video.ts

@@ -0,0 +1,10 @@
+import { DEFAULT_VIDEO_MAX_BASE64_BYTES } from "./defaults.js";
+
+export function estimateBase64Size(bytes: number): number {
+  return Math.ceil(bytes / 3) * 4;
+}
+
+export function resolveVideoMaxBase64Bytes(maxBytes: number): number {
+  const expanded = Math.floor(maxBytes * (4 / 3));
+  return Math.min(expanded, DEFAULT_VIDEO_MAX_BASE64_BYTES);
+}