FFMPEG: Add multiple audio files to the video. Previous audio muffled

FFmpeg is a powerful command-line tool that allows you to manipulate audio and video files. One common task is adding multiple audio files to a video. However, sometimes the previous audio may end up sounding muffled or distorted. In this article, we will explore how to add multiple audio files to a video using FFmpeg and address the issue of muffled audio.

Adding Multiple Audio Files to a Video

To add multiple audio files to a video using FFmpeg, you need to follow these steps:

1. Download and install FFmpeg if you haven't already. FFmpeg is available for Windows, macOS, and Linux.
2. Open the command prompt or terminal on your computer.
3. Navigate to the folder where your video file and audio files are located using the cd command. For example, if your video file is in the "Videos" folder on your desktop, you would use the following command:
   cd Desktop/Videos
4. Run the following command to add the audio files to the video:
   ffmpeg -i input.mp4 -i audio1.mp3 -i audio2.mp3 -map 0 -map 1 -map 2 -c:v copy -c:a aac -shortest output.mp4

Let's break down the command:

• -i input.mp4: Specifies the input video file.
• -i audio1.mp3: Specifies the first input audio file.
• -i audio2.mp3: Specifies the second input audio file.
• -map 0 -map 1 -map 2: Maps the video and audio streams from the input files.
• -c:v copy: Copies the video stream without re-encoding.
• -c:a aac: Encodes the audio stream using the AAC codec.
• -shortest: Sets the output duration to the shortest input duration.
• output.mp4: Specifies the output video file.

Once you run the command, FFmpeg will start processing the video and audio files. The resulting video file will have all the added audio tracks.

Addressing Muffled Audio

If the previously existing audio in the video sounds muffled or distorted after adding additional audio tracks, you can try adjusting the audio levels to improve the overall sound quality. Here's how:

1. Open the command prompt or terminal on your computer.
2. Navigate to the folder where your video file is located using the cd command.
3. Run the following command to adjust the audio levels:
   ffmpeg -i input.mp4 -af "volume=1.5" -c:v copy -c:a aac output.mp4

In this command, the -af "volume=1.5" option increases the audio volume by 50%. You can adjust the value to your desired level. The rest of the command is similar to the previous one, copying the video stream without re-encoding and encoding the audio stream using the AAC codec.

After running the command, FFmpeg will process the video file with the adjusted audio levels. The resulting video file should have improved audio quality.

Conclusion

Adding multiple audio files to a video using FFmpeg is a straightforward process. However, if the previous audio ends up sounding muffled or distorted, you can adjust the audio levels to improve the overall sound quality. By following the steps and commands outlined in this article, you can successfully add multiple audio files to your videos and ensure they sound clear and crisp.