fix: opus sample rate fallback

opus doesn't support 44.1khz
if detected/default sample rate is 44.1khz, uses 48kz instead

src/lib/converters/ffmpeg.svelte.ts

@@ -398,14 +398,23 @@ export class FFmpegConverter extends Converter {
 			// detect sample rate of original file and use
 			if (isLosslessToLossy) {
 				// use safe default
-				sampleRateArgs = ["-ar", "44100"];
+				const defaultRate = to === ".opus" ? "48000" : "44100";
 				log(
 					["converters", this.name],
-					`converting from lossless to lossy, using default sample rate: 44100Hz`,
+					`converting from lossless to lossy, using default sample rate: ${defaultRate}Hz`,
 				);
+				sampleRateArgs = ["-ar", defaultRate];
 			} else {
-				const inputSampleRate =
+				let inputSampleRate = await this.detectAudioSampleRate(ffmpeg);
-					await this.detectAudioSampleRate(ffmpeg);
+				if (to === ".opus" && inputSampleRate === 44100) {
+					// special case: opus does not support 44100Hz which is more common - adjust to 48000Hz
+					log(
+						["converters", this.name],
+						"conversion to opus with 44100Hz sample rate detected, adjusting to 48000Hz",
+					);
+					inputSampleRate = 48000;
+				}
+
 				sampleRateArgs = inputSampleRate
 					? ["-ar", inputSampleRate.toString()]
 					: [];

src/routes/+layout.svelte

@@ -20,9 +20,7 @@
 	} from "$lib/store/index.svelte";
 	import "$lib/css/app.scss";
 	import { browser } from "$app/environment";
-	import { page } from "$app/state";
 	import { initStores as initAnimStores } from "$lib/animation/index.js";
-	import { locales, localizeHref } from "$lib/paraglide/runtime";
 	import { VertdInstance } from "$lib/sections/settings/vertdSettings.svelte.js";
 
 	let { children, data } = $props();

src/routes/about/+page.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { error, log } from "$lib/logger";
+	import { error } from "$lib/logger";
 	import * as About from "$lib/sections/about";
 	import { InfoIcon } from "lucide-svelte";
 	import { onMount } from "svelte";