FFMPEG Use instructions

Original URL:Https://github.com/tonydeng/fmj/blob/master/ffmpeg.md# screenshot command
screenshot Command capture a picture of 352x240 size, format jpg

Ffmpeg-i input_file-y-F image2-t 0.001-s 352x240 output.jpg

convert the first 30 frames of the video into a animated Gif

Ffmpeg-i input_file-vframes 30-y-F gif output.gif

intercept the 230x240 thumbnail in the first 8.01 seconds of the video

Ffmpeg-i input_file-y-F mjpeg-ss 8-t 0.001-s 320x240 output.jpg

cut a picture every second .

Ffmpeg-i out.mp4-f IMAGE2-VF Fps=fps=1 out%d.png

cut a picture every 20 seconds .

Ffmpeg-i out.mp4-f IMAGE2-VF fps=fps=1/20 out%d.png

multiple screenshots merged into a file (2x3) every 1000 frames (seconds =1000/fps25) that is 40s cut a picture

Ffmpeg-i out.mp4-frames 3-vf "Select=not (mod (n\,1000)), scale=320:240,tile=2x3" Out.png

generate GIF pictures from video

Ffmpeg-i out.mp4-t 10-pix_fmt rgb24 out.gif

convert video to picture (one picture per frame)

Ffmpeg-i Out.mp4 Out%4d.png

convert picture to video

Ffmpeg-f image2-i out%4d.png-r Video.mp4

Note: The name of the image entered here must be out0001.png out0002.png ... out0010.png, must be starting from 1 and is a continuous number, or will not find the input picture error.

splitting video and generating m3u8 files

Ffmpeg-i input.mp4-c:v libx264-c:a aac-strict-2-F hls-hls_time 20-hls_list_size 0-hls_wrap 0 output.m3u8

Related parameter Description:

-I input video file
-c:v output video format
-c:a output audio format
-strict-
f HLS output video for HTTP Live Stream (m3u8)
-hls_time Set the length of each slice, The default is 2, the unit is seconds
-hls_list_size set the maximum number of entries saved by the playlist, set to 0 saves all information, defaults to 5
-hls_wrap set how many pieces to start overwriting, if set to 0 will not overwrite, the default value is 0. This option avoids storing too many slices on disk and can limit the maximum number of slices written to disk.

Note that the sequence number of the playlist must be unique for each segment, and it cannot be confused with the file name of the slice (when the wrap option is used, the filename may be reused). Detach video Audio stream

Ffmpeg-i input_file-vcodec Copy-an output_file_video    //Detach video stream ffmpeg-i input_file-acodec copy-vn output_file_
Audio    //detach audio stream

Video Solution multiplexing

Ffmpeg-i test.mp4-vcoder copy-an-f m4v test.264 ffmpeg-i test.avi-vcoder copy-an-f m4v test.264

Video Transfer Code

Ffmpeg-i test.mp4-vcoder h264-s 352*278-an-f m4v test.264    //transcoding for stream original file ffmpeg-i Test.mp4-vcoder h264-bf
0- G 25-s 352-278-an-f M4V test.264    //transcoding code stream original file Ffmpeg-i test.avi-vcoder mpeg4-vtag xvid-qsame test_xvid.avi
  //transcoding for encapsulated file-BF B frame number control, G-key frame interval control,-s resolution control

Video Encapsulation

Ffmpeg-i video_file-i audio_file-vcoder copy-acodec copy output_file

Video Clipping

Ffmpeg-i test.avi-r 1-f image2 image.jpeg//Video capture ffmpeg-i input.avi-ss 0:1:30-t 0:0:20-vcoder copy-acoder
Copy Output.avi//Cut video-R extract image frequency,-ss start time, T duration

Video Recording

Ffmpeg-i rtsp://hostname/test-vcoder Copy Out.avi

YUV Sequence Playback

Ffplay-f rawvideo-video_size 1920x1080 INPUT.YUV

YUV sequence turn avi

Ffmpeg-s w*h-pix_fmt yuv420p-i input.yuv-vcoder MPEG4 Output.avi

General parameter Description Main Parameters

-I set the input stream-
f to set the output format
-ss start time

Video Parameters

-B Set the video flow, the default is 200kbit/s-
s set the screen width and height
-aspect set the proportion of the screen
-VN does not deal with video
-vcoder set video encoder, not set time to use the same as the input stream codec

Audio Parameters

-ar set the sampling rate-ac set the
sound channel number
-ACODEC set the channel number in Shenyang
-an do not process audio

merging MP4 files using FFmpeg

Ffmpeg-i "Apache sqoop Tutorial part 1.mp4"-C copy-bsf:v h264_mp4toannexb-f mpegts intermediate1.ts
ffmpeg-i "Apa Che sqoop Tutorial part 2.mp4 "-C copy-bsf:v h264_mp4toannexb-f mpegts intermediate2.ts
ffmpeg-i" Apache sqoop Tuto Rial part 3.mp4 "-C copy-bsf:v h264_mp4toannexb-f mpegts intermediate3.ts ffmpeg-i
" Apache sqoop Tutorial part 4.MP 4 "-C copy-bsf:v h264_mp4toannexb-f mpegts intermediate4.ts
ffmpeg-i" concat:intermediate1.ts|intermediate2.ts| Intermediate3.ts|intermediate4.ts "-C copy-bsf:a aac_adtstoasc" Apache sqoop tutorial.mp4 "

convert FLV to MP4 using FFmpeg

Ffmpeg-i out.flv-vcodec copy-acodec Copy Out.mp4

Video Add Watermark in the Watermark Bureau

Ffmpeg-i out.mp4-i Sxyx2008@163.com.gif-filter_complex overlay= "(MAIN_W/2)-(OVERLAY_W/2):(MAIN_H/2)-(overlay_h)/2 "Output.mp4

Parameter Interpretation-I out.mp4 (video source)-I sxyx2008@163.com.gif (watermark picture) overlay watermark position Output.mp4 output file video flip and rotate flip Horizontal Flip language Method:-VF Hflip

Ffplay-i OUT.MP4-VF Hflip

Vertical Flip Syntax:-VF vflip

Ffplay-i OUT.MP4-VF Vflip

Rotate

Syntax: transpose={0,1,2,3}

0: Rotate 90° counterclockwise and flip vertically

1: Clockwise rotation 90°

2: Counterclockwise rotation 90°

3: Rotate the 90° clockwise and then flip horizontally to rotate the video clockwise 90 degrees