FFmpeg Common Commands---turn

1. Separating the video audio stream

Ffmpeg-i Input_file-vcodec Copy-an Output_file_video// split video stream ffmpeg-i input_file-acodec copy-vn output_file_audio // split audio stream

2. Video re-use

Ffmpeg–i test.mp4–vcodec copy–an–f M4V test. ffmpeg–i test.avi–vcodec copy–an–f m4v test. the

3. Video transcoding

Ffmpeg–i Test.mp4–vcodec H264–s352*278–an–f M4V test.264 // transcode to stream original file Ffmpeg–i test.mp4–vcodec h264–bf 0–g 25–s 278–an–f m4v test.< Span style= "line-height:1.5!important;" >264 // Transcode to stream original file Ffmpeg–i test.avi-vcodec mpeg4–vtag xvid–qsame test_xvid.avi //< Span style= "line-height:1.5!important;" > transcoding for package file //-BF B-Frame number control,-g Keyframe interval Control,-s resolution control

4. Video Encapsulation

Ffmpeg–i video_file–i audio_file–vcodec copy–acodec copy output_file

5. Video Clipping

Ffmpeg–i Test.avi–r1–f image2 image-%3d.jpeg // extract pictures Ffmpeg-ss 0:1:30-t 0:20-i input.avi-vcodec copy-acodec copy output.avi //< Span style= "line-height:1.5!important;" > cut video //-r the frequency of extracting images,-ss start time,- T duration

6. Video recording

Ffmpeg–i RTSP://192.168.3.205:5555/test–vcodec copy Out.avi

7.YUV sequence Playback

Ffplay-f rawvideo-video_size 1920x1080 INPUT.YUV

8.YUV sequence turn avi

Ffmpeg–s w*h–pix_fmt yuv420p–i input.yuv–vcodec MPEG4 Output.avi

Common parameter Description:

Main parameters:-I set input stream-F Set output format-ss start time video parameter:-B Set Video traffic, default to 200KBIT/S-R set frame rate, default to 25-s setting screen width and height-aspect set screen ratio-vn do not process video-V Codec set video codec, without timing use the same codec audio parameters as the input stream :-ar set the sample rate-AC set the channel number of the sound-acodec set the sound codec, without timing the same codec with the input stream-an do not process audio

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1. Send files to live as Live

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1. Ffmpeg-re-i localfile.mp4-c copy-f flv rtmp://server/live/streamname

2. Save the live media to a local file

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1. Ffmpeg-i rtmp://server/live/streamname-c Copy dump.flv

3, one of the live stream, video instead of H264 compression, audio unchanged, sent to another live streaming service

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1. Ffmpeg-i rtmp://server/live/originalstream-c:a copy-c:v libx264-vpre slow-f flv rtmp://server/live/h264stream

4, one of the live stream, video instead of H264 compression, audio instead of FAAC compression, sent to another live streaming service

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1. Ffmpeg-i rtmp://server/live/originalstream-c:a libfaac-ar 44100-ab 48k-c:v libx264-vpre slow-vpre baseline-f flv r Tmp://server/live/h264stream

5, one of the live stream, the video is unchanged, the audio instead of FAAC compression, sent to another live streaming service

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1. Ffmpeg-i rtmp://server/live/originalstream-acodec libfaac-ar 44100-ab 48k-vcodec copy-f flv rtmp://server/live/h264_ Aac_stream

6, will a high stream, copied to several different video definition of the flow re-release, where the audio does not change

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1. ffmpeg -re -i rtmp://server/live/high_fmle_stream -acodec  copy -vcodec x264lib -s 640x360 -b 500k -vpre medium -vpre  baseline rtmp://server/live/baseline_500k -acodec copy -vcodec x264lib -s  480x272 -b 300k -vpre medium -vpre baseline rtmp://server/live/ baseline_300k -acodec copy -vcodec x264lib -s 320x200 -b 150k - Vpre medium -vpre baseline rtmp://server/live/baseline_150k -acodec libfaac  -vn -ab 48k rtmp://server/live/audio_only_aac_48k  

7, the same function, just use the-x264opts option

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1. ffmpeg -re -i rtmp://server/live/high_fmle_stream -c:a  Copy -c:v x264lib -s 640x360 -x264opts bitrate=500:profile=baseline:preset=slow  rtmp://server/live/baseline_500k -c:a copy -c:v x264lib -s 480x272 - x264opts bitrate=300:profile=baseline:preset=slow rtmp://server/live/baseline_300k -c:a  Copy -c:v x264lib -s 320x200 -x264opts bitrate=150:profile=baseline:preset=slow  rtmp://server/live/baseline_150k -c:a libfaac -vn -b:a 48k rtmp://server/ live/audio_only_aac_48k  

8, the current camera and audio through Dsshow acquisition , video H264, audio FAAC compressed after release

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1. ffmpeg -r 25 -f dshow -s 640x480 -i  Video= "Video source name": audio= "Audio source name"  -vcodec libx264 -b  600k -vpre slow -acodec libfaac -ab 128k -f flv rtmp:// server/application/stream_name  

9, a JPG image through the H264 compression cycle output to MP4 video

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1. Ffmpeg.exe-i input.jpg-an-vcodec libx264-coder 1-flags +loop-cmp +chroma-subq 10-qcomp 0.6-qmin 10-qmax 51-qdif F 4-flags2 +dct8x8-trellis 2-partitions +parti8x8+parti4x4-crf 24-threads 0-r 25-g 25-y OUTPUT.mp4

10, the normal stream video instead of H264 compression, audio unchanged, sent to the HD service (new version of FMS live=1)

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1. Ffmpeg-i rtmp://server/live/originalstream-c:a copy-c:v libx264-vpre slow-f flv "rtmp://server/live/h264stream Live =1〃<br style= "Box-sizing:border-box;"/><br style= "Box-sizing:border-box;/><br style=" box-sizing: Border-box; "/>

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1. Capture USB camera video commands:

Ffmpeg-t 20-f vfwcap-i 0-r 8-f mp4 cap1111.mp4

./ffmpeg-t 10-f vfwcap-i 0-r 8-f mp4 cap.mp4

The specific description is as follows: We collect 10 seconds, the acquisition device for the VFWCAP type equipment, the NO. 0 vfwcap acquisition Equipment (if the system has a number of VFW video capture equipment, can be selected through-I num), 8 frames per second, the output mode is a file, the format of MP4.

2. The simplest screen capture:

Ffmpeg-f gdigrab-i Desktop Out.mpg

3. Starting at the (10,20) point of the screen, grab the 640x480 screen and set the frame rate at 5:

Ffmpeg-f gdigrab-framerate 5-offset_x 10-offset_y 20-video_size 640x480-i Desktop Out.mpg

4.ffmpeg creating a GIF image from your video:

Ffmpeg-i capx.mp4-t 10-s 320x240-pix_fmt rgb24 jidu1.gif

5.ffmpeg convert a picture to a video:

Http://blog.sina.com.cn/s/blog_40d73279010113c2.html

FFmpeg Common Commands---turn