I have several DVD's with audio in either the LEFT or RIGHT channels. One of my biggest pet peeves are people who can't figure out how to hook up BOTH audio channels on a DVD recorder! Ideally I'd like to find software that could change the audio of VOB files directly and save them maintaining the DVD structure without re-authoring. I tried OJOsoft's Total Video Converter which allows you to change the audio to MONO and re-save the VOB, however I was only able to try the trial version which only saves 30 seconds of a file and their website purchase links are broken.
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Wouldn't be easier just to set your receiver to output mono sound in both speakers?I think,therefore i am a hamster.
You can use ffmpeg to reencode the one good channel to a single mono channel:
ffmpeg -i input.ext -map_channel 0.1.0 -c:v copy -c:a mp3 -b:a 128k "output.ext"