ffmpeg -i howToUseWebAppTrackviewer.720p.mov -y -vf "setpts=.5*PTS" -r 24 test1.mp4提取一部分视频:
ffmpeg -ss 00:33:15 -i input.MTS -t 00:02:00 -vcodec copy -acodec copy output.mts
ffmpeg -i input.mts -vcodec mpeg4 -b:v 8M -acodec copy output.mp4$ cat mylist.txt file '/path/to/file1' file '/path/to/file2' file '/path/to/file3' $ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4 timelapse:
ffmpeg -i 1.MTS -y -vf "setpts=.02*PTS" -r 24 sunrise.MTStimelapse + convert to mp4
ffmpeg -i output.mts -y -vf "setpts=.0025*PTS" -r 60 -vcodec mpeg4 -b:v 15M -an sunrise.mp4motion detection
for i in 1 2 3 do ffmpeg -i 0000$i.MTS -codec copy -map 0 output$i.mkv donemotion config file:
netcam_url "file:////path/to/output.mkv" camera_name "localfile" camera_id 1 width 1280 height 720 framerate 29 movie_output on text_right "" movie_max_time 0 movie_codec mp4 movie_quality 80 movie_bps 1200000 pre_capture 10 post_capture 10 on_event_start "echo %v,%{fps},%T,%q >> event.start.txt" on_event_end "echo %v,%{fps},%T,%q >> event.stop.txt" on_camera_lost "killall motion" threshold 200000 log_file "motion.log.txt"run motion:
motion -c camera.conf
wav 转换并切除最后N秒
n=10 for f in *].mp3 do ffmpeg -y -i "$f" -acodec pcm_s16le -ac 1 -ar 16000 -map_metadata -1 \ -t $(( $(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$f" | cut -d\. -f1) - $n)) tmp.wav ffmpeg -y -i tmp.wav "${f/\[www.xk3210.com\].mp3/.mp3}" rm tmp.wav rm "$f" done大转小
-c:v libx264 tells it to use the libx264 encoder,
crf 20 uses the Constant Rate Factor quantiser (which paradoxially means variable bit rate, but constant quality) with a value of 20 (pretty good quality; lower is better quality / larger files, higher is crappier / smaller),
the slow preset is a shortcut for a bunch of encoder settings that means it puts a bit more effort into it than the default (medium).
ffmpeg -i in.mkv -c:v libx264 -crf 20 -preset slow out.mp4
nohup ffmpeg -i in.mkv -vf scale=-1:720 -c:v libx264 -crf 20 -preset slow -c:a copy out.small.mkv > log.txt 2>&1 &