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我的ffmpeg常用命令

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我的 ffmpeg，ffprobe 常用命令

查看视频信息​

ffprobe video.mp4

输出含义：

  • tbn = the time base in AVStream that has come from the container
  • tbc = the time base in AVCodecContext for the codec used for a particular stream
  • tbr = tbr is guessed from the video stream and is the value users want to see when they look for the video frame rate

FFmpeg-users - What does the output of ffmpeg mean? tbr tbn tbc etc?

剪辑​

ffmpeg -ss 0:0:4.000 -t 0:2:00 -i input.mp4 -vcodec copy -acodec copy out.mp4 #不重新编码
ffmpeg -ss 0:0:4.000 -t 0:2:00 -i input.mp4 -vcodec h264 -acodec aac out.mp4 #重新编码

指定间隔截图​

ffmpeg -ss 00:00:10.000 -i sense8.S01E03.start.mp4  -vf fps=fps=10 ../screenshots/screen-%03d.jpg
# fps 后数值越大，截图越多

左右拼接​

ffmpeg -i left.mp4 -i right.mp4 -filter_complex \
"[0:v:0]pad=iw*2:ih[bg]; [bg][1:v:0]overlay=w" output.mp4

合并​

# 新版ffmpeg已经无法使用
ffmpeg -i "concat:input1.flv|input2.flv|input3.flv" -c copy output.mp4

# 通过文件来批量合并
ffmpeg -f concat -safe 0 -i files.txt -c copy output.mp4

# files.txt
file './1.mp4'
file './2.mp4'
file './3.mp4'

ffmpeg 压制带字幕视频​

1280*640​

ffmpeg -i input.mkv -map 0:0 -map 0:1 -c:a aac -ab 192k -strict -2 -async 1 -c:v libx264 -crf 23 -r 25 -s 1280x640 -aspect 2:1 -pix_fmt yuv420p -partitions partb8x8+partp4x4+partp8x8+parti8x8 -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 1 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 25 -g 50 -qmin 3 -qmax 51 -qdiff 4 -metadata creation_time=now -vf subtitles="sub.ass":charenc=utf-8 -sn -y output.mp4

1280*640 -> 1280*720 加黑边​

ffmpeg -i input.mkv -map 0:0 -map 0:1 -c:a aac -ab 320k -strict -2 -async 1 -c:v libx264 -crf 20 -r 24000/1001 -s 1280x720 -aspect 2:1 -pix_fmt yuv420p -partitions partb8x8+partp4x4+partp8x8+parti8x8 -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 1 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 24 -g 48 -qmin 3 -qmax 51 -qdiff 4 -threads 1 -metadata creation_time=now -vf scale=iw*1:ih,"pad=max(iw\,ih*(16/9)):ow/(16/9):(ow-iw)/2:(oh-ih)/2" -sn -aspect 16:9 -y output.mp4

1920*1080 H265 -> H264​

ffmpeg -i input.mp4 -map 0:0 -map 0:1 -c:a aac -ab 192k -strict -2 -async 1 -c:v libx264 -crf 20 -r 24 -s 1920x1080 -aspect 16:9 -pix_fmt yuv420p -partitions partb8x8+partp4x4+partp8x8+parti8x8 -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 1 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 24 -g 48 -qmin 3 -qmax 51 -qdiff 4 -threads 1 -metadata creation_time=now -sn -y output.mp4

视频加封面图片​

ffmpeg -i INPUT.mp4 -i IMAGE.png -acodec copy -vcodec copy -map 0 -map 1:0 OUTPUT.mp4
ffmpeg -i video.mp4 -i image.png -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic out.mp4
# best
ffmpeg -i <video.mp4> -i <cover.jpg> -map 1 -map 0 -c copy -disposition:0 attached_pic out.mp4

flac 转 mp3​

ffmpeg -i input.flac -ab 320k -map_metadata 0 -id3v2_version 3 output.mp3

去片头片尾​

ffmpeg -ss 30 -i test.mp4 -map 0:0 -map 0:1 -c:a aac -ab 96k -strict -2 -async 1 -c:v libx264 -b:v 1414k -maxrate 2828k -bufsize 2828k -r 24 -s 1280x720 -aspect 1280:720 -pix_fmt yuv420p -partitions partb8x8+partp4x4+partp8x8+parti8x8 -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 1 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 24 -g 48 -qmin 3 -qmax 51 -threads 1 -metadata creation_time=now -sn -t 1034 -y test_0.mp4