In our case, the generated audio track will be dummy.opus.
You just need to replace the path wherever you need the audio file and keep it in mind as you will need it to join it to the video. The following command should generate a muted track in opus format using a mono audio channel: ffmpeg -f lavfi -t 1 -i anullsrc=cl=mono. You need to create an empty audio file that will be merged with the video that doesn't have an audio track already. In this article, I will explain to you how to easily create a silenced audio track and merge it with a video without audio tracks using FFmpeg. Usually, a padded silenced audio track will do the trick as specified in the following diagram: If the video file that will be manipulated by FFMpeg doesn't contain an audio track, you will need to add it. When you work with FFMpeg, in most cases, you will need a video with both tracks, the video, and the audio.
This can become troublesome if you don't understand the concept of a video that doesn't have an audio track or a video that has an audio track, but it's empty (silenced, muted). In some cases, when working with videos, you will end up with video files that don't have an audio track included.
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