https://ubuntu.jeasu.kim
https://ubuntu.jeasu.kim/22.04

ffmpeg 로 동영상 사운드 추출
ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac

비디오를 다운로드하려면 다음을 사용할 수 있습니다.
youtube-dl --all-subs "https://www.youtube.com/watch?v=KYBok-XGsKM"

참조
https://askubuntu.com/questions/1022855/download-everything-from-a-youtube-video-using-youtube-dl

youtube-dl 사용법
https://kutar37.tistory.com/entry/youtube-dl-사용법

https://github.com/AlexPresso/VideoStation-FFMPEG-Patcher

영화 720p의 mp4로 ffmpeg 변환 하기
===========================
#!/bin/bash

cd /var/services/homes/shimss
#bash  ./video_auto_encoding.sh

#인코딩할 파일이 있는곳 경로
#directory="/volume2/video/video_file/"
directory='/volume4/vol4/video_v4/'
#인코딩한 파일을 저장할 경로
TRANSCODEPATH='/volume4/vol4/video_v4_encoding/'

echo
for file in $(ls $directory)
do

#인코딩 시작 알림
echo "\"$file\" 인코딩 시작."
#ffmpeg -i "$directory$file" -vcodec libx264 -acodec copy -b:a 192k -level 4.1 "$TRANSCODEPATH${file%.*}.mkv" </dev/null >>$TRANSCODEPATH${file%.*}.log 2>&1
# ok
# ffmpeg -i "$directory$file" -vf scale=1280:720 "$TRANSCODEPATH${file%.*}720p.mp4"
#ffmpeg -i "$directory$file" -vf scale=1280:720 "$TRANSCODEPATH${file%.*}_720p.mp4"  </dev/null >>$TRANSCODEPATH${file%.*}_720p_mp4.log 2>&1
ffmpeg -i "$directory$file" -vf scale=1280:720 "$TRANSCODEPATH${file%.*}_tc_720p.mp4"  </dev/null >>$TRANSCODEPATH${file%.*}_tc_720p_mp4.log 2>&1

#인코딩 종료 알림
echo "\"$file\" 인코딩 종료."


#원본파일 삭제(경우에 따라 생략해도 됩니다.)
#rm -r $directory$file
#echo "\"$file\" 삭제완료."

done
echo;

exit 0

Audio encoders FFmpeg can use
FFmpeg can encode to a wide variety of lossy audio formats.
Here are some popular lossy formats with encoders listed that FFmpeg can use:
Dolby Digital: ac3
Dolby Digital Plus: eac3
TrueHD 0xFBA: truehd
MP2: libtwolame, mp2
Windows Media Audio 1: wmav1
Windows Media Audio 2: wmav2
AAC LC: libfdk_aac, aac
HE-AAC: libfdk_aac
Vorbis: libvorbis, vorbis
MP3: libmp3lame, libshine
Opus: libopus
Based on quality produced from high to low:
libopus > libvorbis >= libfdk_aac > libmp3lame >= eac3/ac3 > aac > libtwolame > vorbis > mp2 > wmav2/wmav1
====================
https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio

[ffmpeg] 명령어 살펴보기 - 네이버 블로그http://m.blog.naver.com › josm17
2016. 1. 18. — -codec:v 옵션은 비디오 스트림의 코덱을 지정한다. ... outfile:infile : 입력파일에서 출력파일로 저장(?)될 메타 데이터 정보 설정.
https://m.blog.naver.com/PostView.naver?isHttpsRedirect=true&blogId=josm17&logNo=220601051707
================
ffmpeg -i "filepath/filename.avi" -codec:v libx264 -profile:v baseline -preset slow -b:v 1000k -maxrate 1000k -bufsize 2000k -vf scale=-1:720 -threads 0 -codec:a aac -b:a 128k -f mp4 -ss 00:01:00 -t 01:00:00 -strict experimental "outputfilepath/outputfilename.mp4"
=============== 설명 입니다 =============