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目擊者行車記錄器 轉檔
sudo add-apt-repository ppa:jon-severinsson/ffmpeg
sudo apt-get update
sudo apt-get install ffmpeg
# start/end and crop
ffmpeg -ss [start_second] -t [period] -i [input.file] -c:a copy -filter:v "crop=640:240:0:0" [output.file]
# use -an to remove audio stream
ffmpeg -ss [start_second] -t [period] -i [input.file] -an -c:a copy -filter:v "crop=640:240:0:0" [output.file]
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