How to convert MONO audio to STEREO audio from a Gnome SimpleScreenRecorder video

Sergi Rodríguez  
13-02-2023 23:32  
2 minutos de lectura  

If you use SimpleScreenRecorder (Gnome native app) you probably know that it record a video file with an audio in MONO, instead of STEREO. So i will show here how to use ffmpeg on linux to fix a recording in audio and convert it to an stereo video file.

It's very easy:

ffmpeg -i input.mp4 -af "pan=stereo|c0=c1|c1=c1" output.mp4

Let me explain how to use it:

  • input.mp4 is the file to be converted. In my case, because it was generated by SimpleScreenRecorder, in fact it doesn't contain a mono audio track, but a STEREO track but where only one of the two channels has audio, the other channel is empty or in "silence". So, technically is stereo and it has 2 audio channels: c0 and c1
  • output.mp4 is the file that you want to get in real stereo, with both channels containing the same audio copied from the original non-empty channel
  • in my case, the channel c1 was the non-empty, so in the parameter -af i put this: "c0=c1" to put an exact copy of the content at c1 in the c0 channel, and also "c1=c1" because i want to keep the channel c1 just as in the original video file.

I love ffmpeg... its beatiful never end. 🤩

Etiquetas : audio | linux

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