Corrected case involving source format

src/converters/ffmpeg.ts

@@ -702,9 +702,41 @@ export async function convert(
   const audioFormatsWithCover = ["m4a", "mp3", "flac", "ogg"];
   const audioFormatsNoCover = ["wav", "aac"];
 
-  if (audioFormatsWithCover.includes(convertTo)) {
+  const audioInputFormats = [
+    "aac",
+    "ac3",
+    "ac4",
+    "aiff",
+    "alac",
+    "amr",
+    "ape",
+    "au",
+    "caf",
+    "dts",
+    "eac3",
+    "flac",
+    "m4a",
+    "m4b",
+    "mka",
+    "mp2",
+    "mp3",
+    "mpc",
+    "ogg",
+    "oga",
+    "opus",
+    "ra",
+    "voc",
+    "wav",
+    "wma",
+    "wv",
+  ];
+
+  if (
+    audioFormatsWithCover.includes(convertTo) &&
+    audioInputFormats.includes(fileType.toLowerCase())
+  ) {
     extraArgs.push("-c:v", "copy", "-disposition:v", "attached_pic");
-  } else if (audioFormatsNoCover.includes(convertTo)) {
+  } else if (audioFormatsNoCover.includes(convertTo) || audioFormatsWithCover.includes(convertTo)) {
     extraArgs.push("-vn");
   }