adding silent audio in ffmpeg

by

anullsrc audio filter

You can use ffmpeg to create the silent audio and combine it with a video in one step. This example will use the anullsrc audio filter to generate stereo silent audio with a sample rate of 44100:

ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -i video.mov -c:v copy -c:a aac -shortest output.mov
  • channel_layout=stereo:sample_rate=44100 is the default, but I included it just as an example of how to use these options.

Ignoring existing audio

If your video input file has audio that you want to ignore then use the -map option to override the default stream selection behavior:

ffmpeg -f lavfi -i anullsrc -i video.mov -c:v copy -c:a aac -map 0:a -map 1:v -shortest output.mp4
  • -map 0:a -map 1:v can be translated as: from the first input (0) use the audio (a), and from the second input (1) use the video (v).

Notes

  • These examples will stream copy the video so it does not get re-encoded (like a “copy and paste”).

  • It is always recommended to use a recent ffmpeg. Links to recent builds are on the FFmpeg Download page or you can refer to a step-by-step guide to compile ffmpeg.

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