From b495d874b627741613aed312a0cb0af4112a5d9a Mon Sep 17 00:00:00 2001
From: nullptr <62841684+not-nullptr@users.noreply.github.com>
Date: Thu, 14 Nov 2024 10:10:44 +0000
Subject: [PATCH] feat: optimize ffmpeg via running in parallel (#17)

---
 src/lib/converters/ffmpeg.svelte.ts | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/lib/converters/ffmpeg.svelte.ts b/src/lib/converters/ffmpeg.svelte.ts
index 7977af7..da5bc50 100644
--- a/src/lib/converters/ffmpeg.svelte.ts
+++ b/src/lib/converters/ffmpeg.svelte.ts
@@ -37,6 +37,7 @@ export class FFmpegConverter extends Converter {
 				coreURL: `${baseURL}/ffmpeg-core.js`,
 				wasmURL: `${baseURL}/ffmpeg-core.wasm`,
 			});
+			// this is just to cache the wasm and js for when we actually use it. we're not using this ffmpeg instance
 			this.ready = true;
 		})();
 	}
@@ -46,21 +47,29 @@ export class FFmpegConverter extends Converter {
 		to: string,
 	): Promise<IFile> {
 		if (!to.startsWith(".")) to = `.${to}`;
+		const ffmpeg = new FFmpeg();
+		const baseURL =
+			"https://cdn.jsdelivr.net/npm/@ffmpeg/core@0.12.6/dist/esm";
+		await ffmpeg.load({
+			coreURL: `${baseURL}/ffmpeg-core.js`,
+			wasmURL: `${baseURL}/ffmpeg-core.wasm`,
+		});
 		const buf = new Uint8Array(input.buffer);
-		await this.ffmpeg.writeFile("input", buf);
+		await ffmpeg.writeFile("input", buf);
 		log(
 			["converters", this.name],
 			`wrote ${input.name} to ffmpeg virtual fs`,
 		);
-		await this.ffmpeg.exec(["-i", "input", "output" + to]);
+		await ffmpeg.exec(["-i", "input", "output" + to]);
 		log(["converters", this.name], `executed ffmpeg command`);
-		const output = (await this.ffmpeg.readFile(
+		const output = (await ffmpeg.readFile(
 			"output" + to,
 		)) as unknown as Uint8Array;
 		log(
 			["converters", this.name],
 			`read ${input.name.split(".").slice(0, -1).join(".") + to} from ffmpeg virtual fs`,
 		);
+		ffmpeg.terminate();
 		return {
 			...input,
 			buffer: output.buffer,