Combine the video of a JW.ORG video file with the audio of another version of that video file

1 minute read

What if you need to play a JW.ORG video file with the neighbor sign language and the audio from another hearing language.

You can do it. All you just need is to download that video in both the sign language and the hearing language that you need and having the Ffmpeg1 on your computing devices.

Ffmpeg can be installed on multiple platforms:

Below are two ways to do that using Ffmpeg:

One is to extract audio from the hearing language video file.

ffmpeg -i HearingLanguage-VideoFile_r720P.mp4 -vn -acodec copy Output-AudioOnlyFile.aac

And then, using the audio file above to replace the audio of the sign language video file.

ffmpeg -i SignLanguage-VideoFile_r720P.mp4 -i Output-AudioOnlyFile.aac -map 0:v -map 1:a -c copy -y Output-AudioVideoFile_r720P.mp4

Or, we replace two lines above by one line below.

ffmpeg -an -i SignLanguage-VideoFile_r720P.MP4 -vn -i HearingLanguage-VideoFile.MP4 -map 0:v -map 1:a -c:v copy -c:a copy Output-AudioVideoFile_r720P.mp4

These lines force Ffmpeg not to re-encode, so that the quality of the sourced video and audio are untouched. Also, the metadata is cloned from the sign language video file, you can rename the output file exactly as the sign language video file to import it back to JW Library Sign Language app via the Import File feature.2

Please keep in mind that all the material on JW.ORG is copyrighted. No ones should post publications of Jehovah’s Witnesses on a personal website or on social media.3


  1. Ffmpeg is a free and open-source software. 

  2. Required JW Sign Language version 4.0 or newer. 

  3. https://www.jw.org/finder?wtlocale=E&docid=2018364&srcid=share