How to Change Audio Track in Video and Shift it with FFmpeg

FFmpeg is a powerful command-line tool that allows you to manipulate audio and video files. One of its many features is the ability to change the audio track in a video and shift it. In this article, we will guide you through the process of using FFmpeg to change the audio track in a video and shift it to your desired position.

Step 1: Install FFmpeg

Before we can start using FFmpeg, we need to install it on our system. FFmpeg is available for Windows, macOS, and Linux. You can download the latest version of FFmpeg from the official website (https://www.ffmpeg.org/). Follow the installation instructions provided for your specific operating system.

Step 2: Prepare the Audio Track

Next, we need to prepare the audio track that we want to replace the existing audio with. Make sure the audio track is in a compatible format supported by FFmpeg, such as MP3 or AAC. If your audio track is not in the correct format, you can use FFmpeg to convert it. Here is an example command to convert an audio file to MP3:

Replace input_audio.wav with the filename of your audio track and output_audio.mp3 with the desired output filename.

Step 3: Change the Audio Track in the Video

Now that we have our audio track ready, we can proceed to change the audio track in the video. Here is the command to do that:

Replace input_video.mp4 with the filename of your video, new_audio.mp3 with the filename of your new audio track, and output_video.mp4 with the desired output filename.

This command tells FFmpeg to take the video from input_video.mp4, the new audio track from new_audio.mp3, and copy the video stream while encoding the audio stream to AAC format. The -map option specifies which streams to include in the output file.

Step 4: Shifting the Audio Track

If you want to shift the audio track in the video to a specific position, you can use the -itsoffset option in FFmpeg. Here is an example command to shift the audio track by 5 seconds:

In this command, the -itsoffset option is followed by the desired offset in seconds. This will shift the audio track by 5 seconds.

Step 5: Save the Output Video

Once you have made the necessary changes to the audio track and shifted it, you can save the output video using the following command:

This command tells FFmpeg to copy both the video and audio streams from the input video to the output video without any additional encoding.

That's it! You have successfully changed the audio track in a video and shifted it using FFmpeg. Feel free to experiment with different audio tracks and offsets to achieve the desired result.

References