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fact, usually there are some audio and video processing of personal or family needs, then do not be familiar with ffmpeg illustrated by means of software, you can get a basic command
G: ffmpeg command skilled use!
T: Do not rote, read, and found himself under the law, knock again, with more, naturally remember. Even forget, I can look it up _
ffmpeg command line tools provided by
ffprobe: as an information query, view audio and video files
ffplay: is a use of FFmpeg and SDL library media player, ijkplayer ffplay is based on the transformation of secondary development, do some hardware work decoding and compatibility.
ffmpeg: The most important, most central. Contains a variety of functions, learning is mainly to learn this stuff.
ffserver: simple streaming media server, in response to client requests the streaming media data stream and sent to the client.
ffprobe
ffprobe [fileName]: direct output file information, obviously, we can see what it represents
# Long, start, bit rate
the Duration: 00: 01: 39.96, Start: 0.000000, bitrate: 1035 kB / S
# Video stream, the encoding format H264 (encapsulation format AVC1), video frame format YUV420P, resolution of 1000x562, the bit rate , frame rate, default represents the default stream, there may be multiple video streams.
Stream # 0: 0 (und) : Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1000x562 [SAR 1: 1 DAR 500: 281], 935 kb / s, 24 fps, 24 tbr, 12288 tbn, 48 TBC (default)
# audio streams, AAC encoding format (MP4A and encapsulation format), the LC Profile is employed, the sampling rate 44.1kHZ, stereo sound, data representing floating-point format, the bit rate of
stream # 0: 1 (und) : audio: AAC (the LC) (MP4A / 0x6134706D), 44100 Hz, Stereo, fltp, 94 kB / S (default)
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ffprobe -show_format [fileName]
ffprobe -show_packets [fileName]
ffprobe -show_frames [fileName]
ffprobe -print_format json -show_streams [fileName]
Attribute Meaning
type (a, v, subtitles, etc.) media_type frame
pict_type frame type (IPB)
image color format pic_fmt frame (YUV420P)
Key_frame whether keyframes
ffplay
player: ffplay [fileName]
directly play the file, the player will also print tone video stream information, see the above by ffprobe to coincide
1.seek: click playback window
2. fast forward and rewind: left and right keys 10s, 1min down keys
3. audio and video switching: W is
4.frame-STEP: S
Loop: ffplay [fileName] -loop [times]
Switching audio and video streams: ffplay [fileName] ast / vst [index]
Nude broadcast audio and video data the PCM / the YUV:
ffplay .PCM -f s161e -channels 2 -Ar 44100
ffplay -f rawvideo as well -pixel_format YUV420P / RGB24 -s * 1920 1080 [fileName]
Audio and video synchronization to audio / video / external clock reference
ffplay [fileName] -sync audio / video / ext
ffmpeg: the most delicious fish, is the most prickly.
ffmpeg -help: can test the following types of parameters
# 1.Global options take effect globally, not only for individual files
# 2.Per-file main options: the operation of each file individually into force
-f fmt specified audio and video formats
-c codec name CODEC
-codec CODEC CODEC name
-pre PRESET PRESET name
-map_metadata outfile [, Metadata]: INFILE [, Metadata] SET Metadata Information of outfile from INFILE
when -t duration specified length
-to time_stop STOP Record time in transcode or
-fs limit_size specified file Maximum size of
-ss time_off specify the start time
-sseof time_off the SET at the start time offset relative to EOF
-seek_timestamp enable / disable Regularly Seeking by timestamp with -ss
-timestamp the SET at the Recording time timestamp ( 'now' to the SET at the Current time)
-metadata string = string add metadata
-program title=string:st=number... add program with specified streams
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
-apad audio pad
-frames number set the number of frames to output
-filter filter_graph set stream filtergraph
-filter_script filename read stream filtergraph description from a file
-reinit_filter reinit filtergraph on input parameter changes
-discard discard
-disposition disposition
# 3. Video options: 视频参数
-vframes number set the number of video frames to output
-r rate 帧率fps
-s size 分辨率
-aspect aspect 指定视频长宽比（4:3,16:9或1.3333，1.7777）
The Number of Number SET -bits_per_raw_sample bits per RAW Sample
-vn cancel the video output
-vcodec enforce codec codec codec ( 'copy' representatives without re-encoding)
-timecode HH: mm: SS [:;.] FF SET TimeCode value Initial.
-pass The n-SELECT Pass Number (. 1 to. 3)
-vf filter_graph SET Video Filters
-ab bitrate Audio bitrate (Please use -b: A)
-b bitrate Video bitrate (Please use -b: V)
-dn Data disable
# 4. audio Options: audio parameters
-aframes number number of audio Frames The sET to Output
-aq quality audio quality provided (designated coding)
-Ar rate set audio sampling rate (in Hz)
-ac channels provided a number of channels mono 2 stereo
-an audio cancellation output
-acodec codec specified audio coding ( 'copy' refers to audio transcoding is not directly copied)
-VOL volume set record volume (256 = normal)
-af filter_graph set audio filters
# 5. Subtitle options
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查询类命令
-version show version
-buildconf show build configuration
-formats show available formats
-muxers show available muxers
-demuxers show available demuxers
-devices show available devices
-codecs show available codecs
-decoders show available decoders
-encoders show available encoders
-bsfs show available bit stream filters
-protocols show available protocols
-filters show available filters
-pix_fmts show available pixel formats
-layouts show standard channel layouts
-sample_fmts show available audio sample formats
-colors show available color names
-sources device list sources of the input device
-sinks device list sinks of the output device
-hwaccels show available HW acceleration methods
命令格式
ffmpeg [global_options] {[input_file_options] -i input_url} {[output_file_options] output_url}
Multiplexing and demultiplexing order
to extract the audio stream
ffmpeg -i input.mp4 -acodec copy -vn out.aac
Extracting video stream
ffmpeg -i input.mp4 -vcodec copy -an out.h264
Format conversion
ffmpeg -i input.mp4 -vcodec copy -acodec copy out.flv
Audio and video merge
ffmpeg -i out.h264 -i out.aac -vcodec copy -acodec copy out.mp4
Data processing bare
# YUV data extraction
ffmpeg -i input.mp4 -an -c: v rawvideo -pixel_format yuv420p out.yuv
# Extracts the PCM data
ffmpeg -i input.mp5 -vn -ar 44100 -ac 2 -f s16le out.pcm
#yuv转h264
ffmpeg -f rawvideo -pix_fmt yuv420p -s 320x240 -r 30 -i out.yuv -c:v libx264 -f rawvideo out.h264
#pcm转wav
ffmpeg -s16le -ar 8000 -ac 2 -acodec pcm_s16le -i input.raw output.wav
Filter
# Add watermark: -vf in the movie logo specified location. scale specified logo size. logo overlay display the location specified
ffmpeg -i 1.mp4 -vf "movie = 2.png , scale = 30: 30 [watermask]; [in] [watermask] overlay = 30: 10 [out]" water.mp4
# Remove the watermark
1. watermark is found
ffplay -i water.mp4 -vf delogo = X = 30: Y = 10: W = 32: H = 31 is: Show. 1 =
2. remove the watermark
ffmpeg -i water.mp4 -vf delogo = x = 30: y = 10: w = 32: h = 31output.mp4
Video # 1 fold reduction: -vf scale Specifies a simple filter scale, iw / 2: -1 iw specified width of the video taken by the integer. -1 represents a height variation along with the width.
ffmpeg -i 1.mp4 -vf scale = iw / 2: -1 scale.mp4
Video cropping
crop format: crop = out_w: out_h: X: Y
out_w: width of the output. In_w width may be used tabular input video.
out_h: height output. You may be used highly in_h tabular input video.
x: X-coordinate
y: Y-coordinate
ffmpeg -i 1.mp4 -vf crop = in_w- 200: -c in_h-200: v libx264 -c: a copy -video_size 1280x720 out.mp4
Speed playback
-filter_complex complex filter, [0: v] represents a (file index number is 0) of a video file as input. setpts = 0.5PTS stamp each frame of video showing pts are multiplied by 0.5, which is less than half the difference. [v] represents an alias output. Similarly the audio is not detailed.
-map complex output can be used, as can be multiplexed stream is output to a specified output file may be output to a plurality of specified files. "[v]" alias filter output as a complex way to the output file stream. Usage map above is complex filters video and audio output to the specified output file.
ffmpeg -i 1.mp4 -filter_complex "[0: v] setpts = 0.5PTS [v]; [0: a] atempo = 2.0 [a]" -map "[v]" -map "[a]" speed. mp4
Symmetric video (horizontal flip)
FFmpeg -i 1.mp4 -filter_complex "[0: V] = PAD IW W = 2 * [A]; [0: V] hflip [B]; [A] [B] = X overlay = w "duicheng.mp4
Video symmetry (vertical flip)
FFmpeg -i 1.mp4 -filter_complex "[0: V] PAD = H = 2 * the IH [A]; [0: V] vflip [B]; [A] [B] = Y overlay = h "duicheng.mp4
画中画
ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex “[1:v]scale=w=176:h=144:force_original_aspect_ratio=decrease[ckout];[0:v][ckout]overlay=x=W-w-10:y=0[out]” -map “[out]” -movflags faststart new.mp4
Volume effect
ffmpeg -i 1.mp4 -af 'volume = 0.5 ' out.mp4
Splicing and cutting audio and video
cropping
ffmpeg -i 1.mp4 -ss 00:00:00 -t 10 out1.mp4
Splicing
text file:
File 'out1.flv'
File 'out2.flv'
File 'out3.flv'
ffmpeg -f -c concat -i text Copy pinjie.mp4
hls slice
-strict -2 use in designating audio AAC.
-f hls turn into m3u8 format.
ffmpeg -i 1.mp4 -c: v libx264 -c : a libfdk_aac -strict -2 -f hls out.m3u8
Video picture system conversion
video to JPEG
-r 1: 1S a
ffmpeg -i 1.mp4 -r 1 -f image2 image- % 3d.jpeg
Pictures turn GIF
ffmpeg -i Image-% 3d.jpeg -r 5 out.gif
Gif video to FIG
ffmpeg -i 1.mp4 -ss 00:00:00 -t 10 out.gif
Image transfer video
ffmpeg -f image2 -i image-% 3d.jpeg images.mp4
Live-related
plug-flow
ffmpeg -re -i out.mp4 -c copy -f flv rtmp: // server / live / streamName
拉流保存
ffmpeg -i rtmp://server/live/streamName -c copy dump.flv
转流
ffmpeg -i rtmp://server/live/originalStream -c:a copy -c:v copy -f flv rtmp://server/live/h264Stream
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