Software⏱️ 3 min read📅 2026-06-11

How to Fix: FFMPEG error while loading shared libraries: libass.so.4: cannot open shared object file: No such file or directory

FFMPEG error while loading shared libraries: libass.so.4: cannot open shared object file: No such file or directory

Quick Answer: Try reinstalling libavutil-dev and libass-dev packages, as the update may have changed their locations.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

FFmpeg users who recently upgraded to Ubuntu 14.10 may experience an error when trying to use FFMPEG due to missing shared libraries. The specific error message 'libass.so.4: cannot open shared object file: No such file or directory' indicates that the system is unable to find the libass library, which is required for FFMPEG to function properly.

This issue can be frustrating for users who rely on FFMPEG for various tasks such as video encoding and decoding, streaming, and more. However, by following the steps outlined in this guide, you should be able to resolve the issue and get back to using FFMPEG without any problems.

⚠️ Common Causes

  • The primary reason for this error is that libass.so.4 was removed from Ubuntu 14.10 due to licensing issues. The library was previously included in the Ubuntu repositories, but its removal has caused compatibility issues with newer versions of FFMPEG.
  • Another possible cause could be a misconfiguration or missing dependencies during the installation process of FFMPEG or libavutil-dev.

✅ Best Solutions to Fix It

Reinstalling libass and updating package indices

  1. Step 1: Run the following command to reinstall libass: sudo apt-get install -f libass
  2. Step 2: Update the package indices by running: sudo apt-get update
  3. Step 3: Install FFMPEG again with the recommended configuration options: sudo apt-get install ffmpeg

Recompiling FFMPEG from source using a custom configuration

  1. Step 1: Download the latest version of FFMPEG from the official repository: wget https://ffmpeg.org/releases/ffmpeg-3.4.1.tar.bz2
  2. Step 2: Extract the downloaded archive: tar xjvf ffmpeg-3.4.1.tar.bz2 -C /usr/local
  3. Step 3: Navigate to the extracted directory and run the configure script with custom options: ./configure --enable-libass --prefix=/usr/local/ffmpeg

🎯 Final Words

By following one of these methods, you should be able to resolve the 'libass.so.4: cannot open shared object file: No such file or directory' error and get back to using FFMPEG without any issues. Remember to update your package indices after reinstalling libass or recompiling FFMPEG from source.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid