fix: Remove .035ms delay after audio cut

package.json

@@ -22,7 +22,6 @@
     "fluent-ffmpeg": "^2.1.2",
     "inquirer": "^8.2.6",
     "jsoning": "^0.13.23",
-    "mp3-cutter": "^1.0.6",
     "open": "^8.4.0",
     "osu-classes": "^3.0.0",
     "osu-parsers": "^4.1.3",

src/merge/audio.ts

@@ -2,24 +2,28 @@ import ffmpeg from "fluent-ffmpeg";
 import ffmpegInstaller from "@ffmpeg-installer/ffmpeg";
 import ffprobe from "@ffprobe-installer/ffprobe";
 import { Difficulty } from "../locally/types";
-const MP3Cutter = require("mp3-cutter");
 
 export async function MergeAudioAndExport(
   firstSong: Difficulty,
   secondSong: Difficulty,
   timecodes: { endOfFirstHalf: number; startOfSecondHalf: number },
   pathToExport: string
 ) {
-  await MP3Cutter.cut({
-    src: `${firstSong.path}/${firstSong.difficulty.general.audioFilename}`,
-    target: "Temp/FirstPart.mp3",
-    end: timecodes.endOfFirstHalf / 1000 + 1, // +1s to avoid unsync audio after fading
-  });
-  await MP3Cutter.cut({
-    src: `${secondSong.path}/${secondSong.difficulty.general.audioFilename}`,
-    target: "Temp/SecondPart.mp3",
-    start: timecodes.startOfSecondHalf / 1000,
-  });
+  await cutMP3Audio(
+    `${firstSong.path}/${firstSong.difficulty.general.audioFilename}`,
+    "Temp/FirstPart.mp3",
+    {
+      end: timecodes.endOfFirstHalf / 1000 + 1, // +1s to avoid unsync audio after fading
+    }
+  );
+
+  await cutMP3Audio(
+    `${secondSong.path}/${secondSong.difficulty.general.audioFilename}`,
+    "Temp/SecondPart.mp3",
+    {
+      start: timecodes.startOfSecondHalf / 1000, // +1s to avoid unsync audio after fading
+    }
+  );
 
   ffmpeg.setFfmpegPath(ffmpegInstaller.path);
   ffmpeg.setFfprobePath(ffprobe.path);
@@ -47,3 +51,32 @@ export async function MergeAudioAndExport(
       .run();
   });
 }
+
+function cutMP3Audio(
+  path: string,
+  output: string,
+  time: {
+    start?: number;
+    end?: number;
+  }
+) {
+  return new Promise((resolve, reject) => {
+    ffmpeg()
+      .input(path)
+      .outputOptions(
+        time.start !== undefined
+          ? `-ss ${time.start || 0}`
+          : `-t ${time.end || 0}`
+      )
+      .output(output)
+      .on("error", function (err) {
+        console.log("An error occurred during cutting: " + err.message);
+        reject(err);
+      })
+      .on("end", function () {
+        resolve(undefined);
+      })
+
+      .run();
+  });
+}

src/merge/propmpts.ts

@@ -2,6 +2,7 @@ import Jsoning from "jsoning";
 import getLocalizationJson from "../lib/localization/main";
 import inquirer from "inquirer";
 import open from "open";
+import fs from "fs";
 
 export async function openOsz(config: Jsoning, oszPath: string) {
   const localization = await getLocalizationJson(config);
@@ -17,7 +18,8 @@ export async function openOsz(config: Jsoning, oszPath: string) {
     ])
     .then((options) => {
       if (options.backToMenu) {
-        open(oszPath);
+        fs.copyFileSync(oszPath, `${oszPath}-exp.osz`);
+        open(`${oszPath}-exp.osz`);
       }
     });
 }