references
https://ubuntuforums.org/showthread.php?t=2074181
https://stackoverflow.com/questions/9913032/ffmpeg-to-extract-audio-from-video
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what have i done ...
# cut/spit/remove/join video using olive. save as video-cutted.m4v
https://www.olivevideoeditor.org/
# extract audio from video using ffmpeg
ffmpeg -i video-cutted.m4v -vn -acodec copy audio.aac
# edit audio using audacity. save as e.g audio-muted.aac
https://www.audacityteam.org/
# import video-cutted.m4v and audio-muted.aac to openshot.
then, remove audio from video using openshot,
by command separate audio (all channels), then delete it. replace with new audio.
https://www.openshot.org/
# exporting. done.
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