fix: budget workers for expensive captures

packages/cli/src/utils/dockerRunArgs.test.ts

@@ -5,7 +5,6 @@ const BASE: DockerRenderOptions = {
   fps: 30,
   quality: "standard",
   format: "mp4",
-  workers: 4,
   gpu: false,
   hdr: false,
   crf: undefined,
@@ -43,17 +42,28 @@ describe("buildDockerRunArgs", () => {
         "standard",
         "--format",
         "mp4",
-        "--workers",
-        "4",
       ]
     `);
   });
 
+  it("omits --workers when auto sizing should happen inside the container", () => {
+    const args = buildDockerRunArgs({ ...FIXED_INPUT, options: BASE });
+    expect(args).not.toContain("--workers");
+  });
+
   it("matches snapshot when every renderer flag is enabled", () => {
     expect(
       buildDockerRunArgs({
         ...FIXED_INPUT,
-        options: { ...BASE, gpu: true, hdr: true, crf: 18, videoBitrate: undefined, quiet: true },
+        options: {
+          ...BASE,
+          workers: 4,
+          gpu: true,
+          hdr: true,
+          crf: 18,
+          videoBitrate: undefined,
+          quiet: true,
+        },
       }),
     ).toMatchInlineSnapshot(`
       [

packages/cli/src/utils/dockerRunArgs.ts

@@ -22,7 +22,7 @@ export interface DockerRenderOptions {
   fps: 24 | 30 | 60;
   quality: "draft" | "standard" | "high";
   format: "mp4" | "webm" | "mov";
-  workers: number;
+  workers?: number;
   gpu: boolean;
   hdr: boolean;
   crf?: number;
@@ -54,8 +54,7 @@ export function buildDockerRunArgs(input: DockerRunArgsInput): string[] {
     options.quality,
     "--format",
     options.format,
-    "--workers",
-    String(options.workers),
+    ...(options.workers != null ? ["--workers", String(options.workers)] : []),
     ...(options.crf != null ? ["--crf", String(options.crf)] : []),
     ...(options.videoBitrate ? ["--video-bitrate", options.videoBitrate] : []),
     ...(options.quiet ? ["--quiet"] : []),