perf(audio): stretch speed regions through libavfilter atempo instead of WSOLA — fixes exports frozen at ~80%

crates/compositor/build.rs

@@ -69,7 +69,7 @@ fn main() {
     if let Some(v) = ff.as_ref() {
         let lib_dir = Path::new(v).join("lib");
         println!("cargo:rustc-link-search=native={}", lib_dir.display());
-        for lib in ["avformat", "avcodec", "avutil", "swscale", "swresample"] {
+        for lib in ["avformat", "avcodec", "avutil", "swscale", "swresample", "avfilter"] {
             println!("cargo:rustc-link-lib=dylib={}", lib);
         }
     }

crates/compositor/wrapper_linux.h

@@ -12,3 +12,6 @@
 #include <libavutil/pixdesc.h>
 #include <libswresample/swresample.h>
 #include <libswscale/swscale.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersrc.h>
+#include <libavfilter/buffersink.h>

crates/compositor/wrapper_macos.h

@@ -17,4 +17,7 @@
 /* Software decode path : swscale était déjà LIÉ (build.rs) sans être bindé.
    Conservé identique côté macOS pour que la symétrie avec cpu_frames_windows.rs
    soit claire ; le code effectif vit dans mac_frames.rs. */
-#include <libswscale/swscale.h>
+#include <libswscale/swscale.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersrc.h>
+#include <libavfilter/buffersink.h>

crates/compositor/wrapper_windows.h

@@ -12,3 +12,6 @@
    elle couvre les formats exotiques (10 bits, 4:2:2) qu'un interleave écrit à la
    main casserait silencieusement. */
 #include <libswscale/swscale.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersrc.h>
+#include <libavfilter/buffersink.h>

scripts/before-pack.cjs

@@ -75,13 +75,16 @@ const MAC_REQUIRED = [
 		breaks: "the preview and every export render nothing",
 		fix: FIX_MAC,
 	},
-	{
-		match: (name) => /^libav(codec|format|util)\.\d+\.dylib$/.test(name),
-		what: "the LGPL ffmpeg dylibs the compositor links",
+	// One requirement per library, not `atLeast: N` over a combined regex — the
+	// same trap LINUX_REQUIRED documents above. Several versioned copies of one
+	// library would satisfy a combined count while another was missing entirely,
+	// and the addon would still fail to load.
+	...["avcodec", "avformat", "avutil", "swresample", "swscale", "avfilter"].map((library) => ({
+		match: (name) => new RegExp(`^lib${library}\\.\\d+\\.dylib$`).test(name),
+		what: `the LGPL lib${library} dylib the compositor links`,
 		breaks: "the compositor addon cannot be loaded at all (dyld error at require())",
 		fix: FIX_MAC,
-		atLeast: 3,
-	},
+	})),
 	{
 		match: (name) => name === "whisper-stt-server",
 		what: "the whisper.cpp STT helper",
@@ -131,7 +134,7 @@ const LINUX_REQUIRED = [
 	// pendant qu'une autre manquait. Le paquet passait alors la garde et le
 	// compositeur ne chargeait pas : exactement le mode de panne que cette garde
 	// existe pour attraper.
-	...["avcodec", "avformat", "avutil", "swresample", "swscale"].map((library) => ({
+	...["avcodec", "avformat", "avutil", "swresample", "swscale", "avfilter"].map((library) => ({
 		match: (name) => new RegExp(`^lib${library}\\.so\\.\\d+$`).test(name),
 		what: `the symbol-renamed lib${library} shared object the compositor links`,
 		breaks: "the compositor addon cannot be loaded at all (ld.so error at require())",
@@ -234,7 +237,7 @@ const WIN_REQUIRED = [
 	// (avcodec-60/61/62.dll left by an earlier fetch) would satisfy a combined count
 	// while another library was missing entirely, and the addon would still fail to
 	// load.
-	...["avcodec", "avformat", "avutil"].map((library) => ({
+	...["avcodec", "avformat", "avutil", "swresample", "swscale", "avfilter"].map((library) => ({
 		match: (name) => new RegExp(`^${library}-\\d+\\.dll$`).test(name),
 		what: `the ${library} DLL the compositor links`,
 		breaks: "the addon cannot be loaded at all under MSIX, which ignores PATH",

scripts/build-linux-compositor-addon.mjs

@@ -16,7 +16,7 @@
 //      (ensureFfmpegSharedDllsOnPath), but glibc reads LD_LIBRARY_PATH once at
 //      process start, so the equivalent trick cannot work after Electron is
 //      already running. Instead the addon is linked with `-rpath,$ORIGIN` and
-//      the five ffmpeg sonames are copied next to it, which makes the .node
+//      the six ffmpeg sonames are copied next to it, which makes the .node
 //      self-contained wherever it is installed — no env var, no PATH surgery.
 
 import { spawnSync } from "node:child_process";
@@ -36,6 +36,7 @@ const FFMPEG_SONAMES = [
 	"libavutil.so.60",
 	"libswscale.so.9",
 	"libswresample.so.6",
+	"libavfilter.so.11",
 ];
 
 const run = (command, args, options = {}) =>

scripts/fetch-ffmpeg.mjs

@@ -407,13 +407,33 @@ async function fetchSharedDlls(tag, binDir) {
 		return;
 	}
 
-	// probe for any previously vendored DLL by name; re-download is driven by
-	// --force same as the static exe, checked once we know what we'd extract.
-	const alreadyVendored =
-		process.platform === "win32" &&
+	// Completeness probe, not a mere existence probe. The compositor addon now
+	// links six shared ffmpeg DLLs — see crates/compositor/build.rs
+	// (avcodec, avformat, avutil, swresample, swscale, avfilter). A warm dev/CI
+	// tree that already holds the five pre-avfilter DLLs would satisfy an "any
+	// av*.dll is present" check and let `avfilter-11.dll` go un-vendored, breaking
+	// require() at runtime (OpenScreen#371 review, EtienneLescot). Require all
+	// six explicitly so a missing one forces a re-vendor.
+	const REQUIRED_SHARED_DLLS = [
+		"avcodec",
+		"avformat",
+		"avutil",
+		"swresample",
+		"swscale",
+		"avfilter",
+	];
+	fs.mkdirSync(binDir, { recursive: true });
+	const vendoredFiles = new Set(
 		fs
 			.readdirSync(binDir, { withFileTypes: true })
-			.some((e) => e.isFile() && isSharedLib(e.name) && /^(lib)?av/i.test(e.name));
+			.filter((e) => e.isFile())
+			.map((e) => e.name),
+	);
+	const alreadyVendored =
+		process.platform === "win32" &&
+		REQUIRED_SHARED_DLLS.every((lib) =>
+			[...vendoredFiles].some((f) => new RegExp(`^${lib}-\\d+\\.dll$`).test(f)),
+		);
 	// The build-time SDK comes out of this same archive, so a tree that has the
 	// DLLs but not the SDK must still re-download — otherwise we skip here and
 	// the compositor build fails afterwards on the missing FFMPEG_DIR.

technical-documentation/engineering/build-and-packaging.md

@@ -204,7 +204,7 @@ The hook now reads `electron/native/bin/darwin-<arch>/` — the directory `mac.e
 | Required | Without it |
 |---|---|
 | `compositor_view.node` | preview and every export render nothing |
-| `libavcodec/libavformat/libavutil.*.dylib` | the addon cannot load at all (dyld error at `require()`) |
+| `libavcodec/libavformat/libavutil/libavfilter/libswresample/libswscale.*.dylib` | the addon cannot load at all (dyld error at `require()`) |
 | `whisper-stt-server` | transcription and captions fail with a developer error shown to end users |
 | `libggml*.dylib` | the helper dies in dyld before `main()`; STT times out with no diagnostic |
 | `openscreen-screencapturekit-helper` | native screen capture unavailable |