ffmpeg常用命令

阿新 • • 發佈：2019-01-21

1、列舉裝置

ffmpeg -list_devices true -f dshow -i dummy

2、最簡單的抓屏：

ffmpeg -f gdigrab -i desktop out.mpg

從螢幕的（10,20）點處開始，抓取640x480的螢幕，設定幀率為5:

ffmpeg -f gdigrab -framerate 5 -offset_x 10 -offset_y 20 -video_size 640x480 -i desktop out.mpg

錄麥克風和桌面

E:\\ffmpeg.exe -f gdigrab -framerate 25 -video_size 1366x768 -i desktop -f dshow -i audio="麥克風 (Realtek High Definition Audio)" -vcodec libx264 -preset:v ultrafast -tune:v zerolatency -pix_fmt yuv420p -q:v 1 -ar 22050 -ac 1 -s 1366x768 -y e://out.mp4

gdigrab http://www.ffmpeg.org/ffmpeg-devices.html 網頁幫助引數幫助

Win32 GDI-based screen capture device.

This device allows you to capture a region of the display on Windows.
There are two options for the input filename: desktop or title=window_title

The first option will capture the entire desktop, or a fixed region of the desktop. The second option will instead capture the contents of a single window, regardless of its position on the screen.

For example, to grab the entire desktop using ffmpeg:

ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg

Grab a 640x480 region at position 10,20:
ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg

Grab the contents of the window named "Calculator"
ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg

ffmpeg抓屏並推送流到rtmp伺服器中

D:\BaiduYunDownload\ffmpeg-shared\ffmpeg-bin\ffmpeg.exe -f dshow -i video="Integrated Camera" -vcodec libx264 -preset:v ultrafast -tune:v zerolatency -s 480x320 -f flv rtmp://192.168.1.124/live/livestream

//延時比較大，有可能是緩衝區太大的原因

D:\BaiduYunDownload\ffmpeg-shared\ffmpeg-bin\ffplay -max_delay 100000 "rtmp://192.168.1.124/live/livestream live=1"

//開啟會有點慢，但是沒有延時
D:\BaiduYunDownload\ffmpeg-shared\ffmpeg-bin\ffplay.exe -fflags nobuffer -f flv "rtmp://192.168.1.124/live/livestream live=1"

3、rtmpdump 可使用命令

直播流
rtmpdump.exe -o savename.flv -r rtmp://127.0.0.1/live/testlive -v
點播流
rtmpdump.exe -o savename.flv -r rtmp://127.0.0.1/vod/test.flv
直播需要加-v引數

4、將yuv編碼成h264

ffmpeg -i src_480x272.yuv aa.h264 提示 Output file #0 does not contain any stream
應該是 ffmpeg -s 480x272 -i src_480x272.yuv aa.h264 而且必須是放在 -i之前，確定是輸入引數，否則變成輸出引數了

5、如何設定logo

設定logo

ffmpeg -y -i input.mp4 -vf "movie='D\:\path\logo.png' [logo];[in][logo] overlay=10:10 [out]" output.mp4

設定磨砂，馬賽克：去除logo

ffmpeg -i JINUSEAN.mp4 -vf delogo=x=72:y=32:w=168:h=86:band=10 output.mp4

6、直播地址：

香港衛視,

rtmp://live.hkstv.hk.lxdns.com/live/hks

美國中文衛視

rtmp://media3.sinovision.net:1935/live/livestream

7、錄製桌面和攝像頭實現畫中畫

ffmpeg -f gdigrab -i desktop -f dshow -i video="Integrated Camera" -r 25 -c:v libx264 -preset ultrafast -filter_complex overlay=main_w-overlay_w-10:main_h-overlay_h-10 -acodec mp3 -ar 44100 -ac 2 -t 30 d:/video/desktopAndCamera.mp4 -y

//設定一下第二個檔案輸出的大小，此時沒有音訊輸入

ffmpeg -f gdigrab -i desktop -f dshow -i video="Integrated Camera" -filter_complex "[1:v]scale=w=150:h=150:force_original_aspect_ratio=decrease[ckout];[0:v][ckout]overlay=x=W-w-10:y=H-h-10[out]" -map "[out]" -movflags faststart -t 30 d:/video/desktopAndCamera.mp4 -y

//新增音訊 -map 是用幾個輸出 -map "[out]"相當於輸出的第1個流 -map 2 相當於將第二個輸入作為輸出的第2個流

ffmpeg -f gdigrab -i desktop -f dshow -i video="Integrated Camera" -f dshow -i audio="External Microphone (Conexant SmartAudio HD)" -filter_complex "[1:v]scale=w=150:h=150:force_original_aspect_ratio=decrease[ckout];[0:v][ckout]overlay=x=W-w-10:y=H-h-10[out]" -map "[out]" -map 2 -movflags faststart -acodec mp3 -ar 44100 -ac 2 -t 30 d:/video/desktopAndCamera.mp4 -y

8、設定混音，多個音訊檔案合併成一個檔案使用的filter中的 amix

主要是針對於16位的表示大小

原理是將同一點的音訊相加，得到的就是該點的值參考：http://blog.csdn.net/xiaojun111111/article/details/52692077

ffmpeg.exe -re -i 1234.mp4 -f dshow -i audio=”立體聲混音 (Realtek High Definition ” -filter_complex amix=inputs=2:duration=first:dropout_transition=0 -t 10 out.mp4 -y

參考： http://blog.csdn.net/xiaojun111111/article/details/52467815

ffmpeg -i d:/video/wangfeng.mp4 -i d:/video/quwanting.mp4 -map 0:0 -map 0:1 -map 1:0 -map 1:1 -c copy -programtitle=CCTV1:program_num=1:st=0:st=1-program title=CCTV2:program_num=2:st=2:st=3-y -f mpegts d:/video/multiProgram.ts

10、合併檔案

ffmpeg -safe 0 -y -f concat -i concat.txt -c copy -strict experimental -f mp4 TEMP_123.mp4

concat.txt 檔案格式：

file 3cac8f76b06d4af69695c3d00ec0795f_h2642000000nero_aac16-1.mp4
file 3cac8f76b06d4af69695c3d00ec0795f_h2642000000nero_aac16-2.mp4
file 3cac8f76b06d4af69695c3d00ec0795f_h2642000000nero_aac16-3.mp4

11、給視訊（無音訊流）新增音訊流：

ffmpeg -re -i rtmp://onairzb.cdvcloud.com/d5039f/4859cc -f lavfi -i "anullsrc=r=44100:cl=stereo" -vcodec copy -acodec aac -ar 44100 -ac 2 -strict -2 -f flv rtmp://192.168.0.95/live/123456

其中ffmpeg 官方文件中有 Video Source 和 Audio Source, 需要和 -f lavfi (代表使用虛擬裝置)

可以檢視官方文件

12.疊加多張logo：

ffmpeg -i d:/video/wangfeng.mp4 -i d:/video/logo.png -i d:/video/logo.png -filter_complex "overlay=x=10:y=10,overlay=x=W-w-10:y=H-h-10" d:/video/wangfenglogo.mp4

ffmpeg -i d:/video/wangfeng.mp4 -i d:/video/logo.png -i d:/video/logo.png -filter_complex "[0:v]scale=960:640[sout],[1:v]scale=100:100[logo1],[sout][logo1]overlay=x=10:y=10[lout1],[2:v]scale=100:100[logo2],[lout1][logo2]overlay=x=W-w-30:y=H-h-30" d:/video/wangfenglogo.mp4

ffmpeg -i d:/video/wangfeng.mp4 -filter_complex "[0:v]scale=960:640[sout],movie='d\:/video/logo.png'[m1],[m1]scale=100:100[logo1],[sout][logo1]overlay=x=10:y=10[lout1],movie='d\:/video/logo.png'[m2],[m2]scale=100:100[logo2],[lout1][logo2]overlay=x=W-w-30:y=H-h-30" d:/video/wangfenglogo.mp4

12.1新增timeline，logo可以階段顯示

ffmpeg -i d:/video/wangfeng.mp4 -filter_complex "[0:v]scale=960:640[sout],movie='d\:/video/logo.png'[m1],[m1]scale=100:100[logo1],[sout][logo1]overlay=x=10:y=10:enable=between(t\,10.0\,20.0)[lout1],movie='d\:/video/logo.png'[m2],[m2]scale=100:100[logo2],[lout1][logo2]overlay=x=W-w-30:y=H-h-30" d:/video/wangfenglogo.mp4

12.2 logo使用gif，無限迴圈，使用loop，setpts，shortest，注意window的ffmpeg 卡死有問題

transcode -y -i 'ftp://scott:[email protected]/lxj/1.mp4' -filter_complex "[0:v]scale=640:360[s363],movie=filename=\'ftp://scott:[email protected]/lxj/logo.gif\':loop=0,setpts=N/(FRAME_RATE*TB)[logomovie363_0],[logomovie363_0]scale=100:100[logoscale363_0],[s363][logoscale363_0]overlay=x=10:y=10:shortest=1[out363]" -map [out363] -c:v h264 -b:v 500k -crf 23 -r 25.0 -g 250 -map 0:a -c:a aac -ab 32k -ac 1 -ar 22050 -strict experimental -f mp4 TEMP_text123.mp4

13疊加字幕：

ffmpeg -i d:/video/wangfeng.mp4 -filter_complex [0:v]drawtext="fontfile=simsun.ttc:text='Test Text':x=100:y=50:fontsize=24:[email protected]:box=1:[email protected]"[dt1];[dt1]drawtext="fontfile=simsun.ttf:text='hello world':x=100:y=100:fontsize=24:[email protected]:box=1:[email protected]"[vout] -map [vout] d:/video/wangfeng_drawtext.mp4

14.視訊加密：

最新的ffmpeg支援hls_enc_key hls_enc_uri
transcode_has_dash.bak -timeout -1 -y -i 'ftp://scott:[email protected]/lxj/1.mp4' -filter_complex "[0:v]scale=640:360[out371]" -map [out371] -c:v h264 -b:v 500k -crf 23 -r 25.0 -g 250 -map 0:a -c:a aac -ab 32k -ac 1 -ar 22050 -strict experimental -f hls -hls_time 10 -hls_segment_filename text132.m3u8_%d.ts -hls_list_size 0 -hls_enc_key encryptionkey128 -hls_enc_key_url http://192.168.0.85/ text132.m3u8

相應引數：
"extra_param":" -hls_enc 1 -hls_enc_key encryptionkey128 -hls_enc_key_url 'http://192.168.0.85/file.key' ",
"format":"hls",

"output_file" : "text143.m3u8"

15.檔案迴圈推流：

ffmpeg迴圈推流，新增genpts，不能copy檔案，時間戳不遞增導致問題

ffmpeg -threads 2 -fflags +genpts -stream_loop -1 -re -i wangfeng1.mp4 -c:v h264 -c:a aac -f flv rtmp://192.168.0.95/live/12345