ffmpeg-commands.md

FFMPEG-commands

自用简单操作备份

基本设置

码率, 分辨率

• b:v 视频码率; b:a 音频码率
• -vf scale=640:360 分辨率

ffmpeg -i input.mp4 -b:v 1M -b:a 192k output.avi

剪切(不重新压缩)

-c:v copy -c:a copy

帧率

-filter:v fps=30

剪辑视频

ffmpeg -f image2 -i /path/to/file/image%3d.jpg test.avi

If your files are named image0.jpg, image1.jpg, image2.jpg, etc. then you'd use /path/to/file/image%d.jpg.

编辑视频

剪切

ffmpeg -i in.mov -ss 200 -to 400                     (200秒到400秒)
ffmpeg -i in.mov -ss 00:01:30 -to 00:02:12     (时间切割)

旋转

ffmpeg -i in.mov -vf "transpose=1" out.mov

• 0 = 90CounterCLockwise and Vertical Flip (default)
• 1 = 90Clockwise
• 2 = 90CounterClockwise
• 3 = 90Clockwise and Vertical Flip
• Use -vf "transpose=2,transpose=2" for 180 degrees.

倒放

-vf reverse -y reverse.mp4

补帧

ffmpeg \
  -i input.mp4 \
  -crf 10   -vf "minterpolate=fps=60:mi_mode=mci:mc_mode=aobmc:me_mode=bidir:vsbmc=1" 

ControlNet

录制竖屏视频, 旋转:

# 2 = 90CounterClockwise
ffmpeg -i <src.mp4> -ss 00:00:02 -to 00:01:51 -vf "transpose=2" <out.mp4>

按8fps导出图片到out00001.png:

ffmpeg -i <out.mp4> -vf fps=8 -start_number 00001 -q:v 1 out%05d.png

把图片转回视频:

ffmpeg -framerate 9 -i out%05d.png -vf "setpts=11/100*PTS" -c:v libx264 -pix_fmt yuv420p output.mp4

dir /b "D:\Andrew\Videos\hand_in_hand_pose\*.png" | ffmpeg -f image2pipe -framerate 1 -i - -ss 0:00 -i orig.mp4 -c:v libx264 -c:a copy -shortest -r 8 -pix_fmt yuv420p raw.mp4

音频相关

parsing - How can I extract audio from video with ffmpeg? - Stack Overflow

提取mkv音频:

ffmpeg -i input-video.avi -vn -acodec copy output-audio.flac

按时间段批量提取音频 (去掉-c copy来重新编码):

ffmpeg -i output.mp3 -c copy -f segment -segment_times 0,3472.683,7642.058 -segment_start_number 1 ch%d.flac

导出mkv的时间(chapters)到文本文档:

 ffprobe -i "sth.mkv"   -show_chapters > extracted_chapters.txt

使用ffmpeg, 视频转音频: ffmpeg -i pt1.mkv pt1.aac