diff --git a/@types/sei-helper.d.ts b/@types/sei-helper.d.ts
index 740ccfb..4617d82 100644
--- a/@types/sei-helper.d.ts
+++ b/@types/sei-helper.d.ts
@@ -1,7 +1,6 @@
 declare module 'sei-helper' {
   export async function question(qStr: string): Promise<string>;
   export function cleanupFilename(str: string): string;
-  export function exec(str: string, str1: string, str2: string);
   export const cookie: {
     parse: (data: Record<string, string>) => Record<string, {
       value: string;
diff --git a/crunchy.ts b/crunchy.ts
index bac4c0d..1325d36 100644
--- a/crunchy.ts
+++ b/crunchy.ts
@@ -1273,12 +1273,10 @@ export default class Crunchy implements ServiceClass {
     // mergers
     let isMuxed = false;
     if (bin.MKVmerge) {
-      const command = merger.MkvMerge();
-      shlp.exec('mkvmerge', `"${bin.MKVmerge}"`, command);
+      await merger.merge('mkvmerge', bin.MKVmerge);
       isMuxed = true;
     } else if (bin.FFmpeg) {
-      const command = merger.FFmpeg();
-      shlp.exec('ffmpeg', `"${bin.FFmpeg}"`, command);
+      await merger.merge('ffmpeg', bin.FFmpeg);
       isMuxed = true;
     } else{
       console.log('\n[INFO] Done!\n');
diff --git a/funi.ts b/funi.ts
index cad8bf5..b8073a5 100644
--- a/funi.ts
+++ b/funi.ts
@@ -798,12 +798,10 @@ export default class Funi implements ServiceClass {
     });
   
     if(mergerBin.MKVmerge){
-      const command = mergeInstance.MkvMerge();
-      shlp.exec('mkvmerge', `"${mergerBin.MKVmerge}"`, command);
+      await mergeInstance.merge('mkvmerge', mergerBin.MKVmerge);
     }
     else if(mergerBin.FFmpeg){
-      const command = mergeInstance.FFmpeg();
-      shlp.exec('ffmpeg',`"${mergerBin.FFmpeg}"`,command);
+      await mergeInstance.merge('ffmpeg', mergerBin.FFmpeg);
     }
     else{
       if (log)
diff --git a/modules/module.merger.ts b/modules/module.merger.ts
index 05e554e..82d1a1a 100644
--- a/modules/module.merger.ts
+++ b/modules/module.merger.ts
@@ -4,6 +4,8 @@ import path from 'path';
 import fs from 'fs';
 import { LanguageItem } from './module.langsData';
 import { AvailableMuxer } from './module.args';
+import { exec } from './sei-helper-fixes';
+import { PromiseWithChild } from 'child_process';
 
 export type MergerInput = {
   path: string,
@@ -277,6 +279,32 @@ class Merger {
     return fontsList;
   }
 
+  public async merge(type: 'ffmpeg'|'mkvmerge', bin: string) {
+    let command: string|undefined = undefined;
+    switch (type) {
+    case 'ffmpeg':
+      command = this.FFmpeg();
+      break;
+    case 'mkvmerge':
+      command = this.MkvMerge();
+      break;
+    }
+    if (command === undefined) {
+      console.log('[WARN] Unable to merge files.');
+      return;
+    }
+    console.log(`[INFO][${type}] Started merging`);
+    const res = exec(type, `"${bin}"`, command);
+    if (!res.isOk && type === 'mkvmerge' && res.err.code === 1) {
+      console.log(`[INFO][${type}] Mkvmerge finished with at least one warning`);
+    } else if (!res.isOk) {
+      console.log(res.err);
+      console.log(`[ERROR][${type}] Merging failed with exit code ${res.err.code}`);
+    } else {
+      console.log(`[INFO][${type} Done]`);
+    }
+  }
+
   public cleanUp() {
     this.options.onlyAudio.concat(this.options.onlyVid).concat(this.options.videoAndAudio).forEach(a => fs.unlinkSync(a.path));
     this.options.subtitles.forEach(a => fs.unlinkSync(a.file));
diff --git a/modules/sei-helper-fixes.ts b/modules/sei-helper-fixes.ts
new file mode 100644
index 0000000..112f0e8
--- /dev/null
+++ b/modules/sei-helper-fixes.ts
@@ -0,0 +1,28 @@
+import childProcess from 'child_process';
+
+const exec = (pname: string, fpath: string, pargs: string, spc = false): {
+  isOk: true
+} | {
+  isOk: false,
+  err: Error & { code: number }
+} => {
+  pargs = pargs ? ' ' + pargs : '';
+  console.log(`\n> "${pname}"${pargs}${spc ? '\n' : ''}`);
+  try {
+    childProcess.execSync((fpath + pargs), { stdio: 'inherit' });
+    return {
+      isOk: true
+    };
+  } catch (er) {
+    const err = er as Error & { status: number };
+    return {
+      isOk: false,
+      err: {
+        ...err,
+        code: err.status
+      }
+    };
+  }
+};
+
+export { exec };
\ No newline at end of file