使用ffmpeg通過錄制音視頻，分為兩種：
1、一種是錄制麥克風和電腦自帶攝像頭的音視頻
2、一種是錄制電腦系統自帶的音頻和錄屏
本節說明一下怎么實現音視頻的錄制，并且進行一些參數的調節

一、安裝、設備查看

1、dshow軟件安裝

• 是桌面錄制和系統音頻錄制的一個插件
• 先安裝dshow軟件 Screen Capturer Recorder，
• 項目地址： https://sourceforge.net/projects/screencapturer/files/

2、查看當前可用于錄制的設備

• 然后查看可用設備名字：ffmpeg -list_devices true -f dshow -i dummy

• 提取關鍵信息如下：

  • “Lenovo EasyCamera” #聯想自帶的攝像
  • “screen-capture-recorder” #屏幕捕獲器，是dshow軟件虛擬出來的，錄制桌面
  • “楹﹀厠椋?(High Definition Audio 璁懼)” #音頻設備麥克風
  • “virtual-audio-capturer” #錄制系統聲音，只使用這個錄制出來只有系統的聲音，沒有麥克風的聲音

• 具體打印如下

C:\Users\Administrator>ffmpeg -list_devices true -f dshow -i dummy ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developersbuilt with gcc 9.1.1 (GCC) 20190807configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray - -enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libth eora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libv idstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmptlibavutil 56. 31.100 / 56. 31.100libavcodec 58. 54.100 / 58. 54.100libavformat 58. 29.100 / 58. 29.100libavdevice 58. 8.100 / 58. 8.100libavfilter 7. 57.100 / 7. 57.100libswscale 5. 5.100 / 5. 5.100libswresample 3. 5.100 / 3. 5.100libpostproc 55. 5.100 / 55. 5.100 [dshow @ 009fdb00] DirectShow video devices (some may be both video and audio devices) [dshow @ 009fdb00] "Lenovo EasyCamera" #聯想自帶的攝像機 [dshow @ 009fdb00] Alternative name "@device_pnp_\\?\usb#vid_5986&pid_055e&mi_00#7&330b8916&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global" [dshow @ 009fdb00] "screen-capture-recorder" #屏幕捕獲器，是dshow軟件虛擬出來的 [dshow @ 009fdb00] Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA6930A-2C8A-4AE6-A561-56E4B5044439}" [dshow @ 009fdb00] DirectShow audio devices [dshow @ 009fdb00] "楹﹀厠椋?(High Definition Audio 璁懼)"#麥克風 [dshow @ 009fdb00] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\楹﹀厠椋?(High Definition Audio 璁懼)" [dshow @ 009fdb00] "virtual-audio-capturer" #錄制系統聲音 [dshow @ 009fdb00] Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E14549B-DB61-4309-AFA1-3578E927E935}" dummy: Immediate exit requested

二、音視頻錄制

1、錄制視頻（默認參數）

• 桌面：

ffmpeg -f dshow -i video="screen-capture-recorder" v-out.mp4

-f dshow：表示插件，-i video表示輸入時桌面錄制設備

• 攝像頭：

ffmpeg -f dshow -i video="Lenovo EasyCamera" -y v-out2.flv (要根據自己攝像頭名稱)

2、錄制聲音（默認參數）

• 系統聲音：

ffmpeg -f dshow -i audio="virtual-audio-capturer" a-out.aac

• 系統+麥克風聲音：

ffmpeg -f dshow -i audio="麥克風 (High Definition Audio)" -f dshow -i audio="virtual-audio-capturer" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 a-out2.aac 使用過濾器filter_complex將麥克風音頻和系統音頻混音錄制

3、音視頻混合錄制

• 同時錄制聲音和視頻（默認參數）

ffmpeg -f dshow -i audio="麥克風 (Realtek Audio)" -f dshow -i audio="virtualaudio-capturer" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f dshow -i video="virtual-audio-capturer" -y av-out.flv

• 錄制屏幕視頻和系統音頻：

ffmpeg -f dshow -i audio="virtual-audio-capturer" -f dshow -i video="screen-capture-recorder" -y av-out.flv

三、錄制參數設置

1、查看可設錄制參數

ffmpeg -f dshow -list_options true -i video=“screen-capture-recorder”

ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developersbuilt with gcc 9.1.1 (GCC) 20190807configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray - -enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libth eora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libv idstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmptlibavutil 56. 31.100 / 56. 31.100libavcodec 58. 54.100 / 58. 54.100libavformat 58. 29.100 / 58. 29.100libavdevice 58. 8.100 / 58. 8.100libavfilter 7. 57.100 / 7. 57.100libswscale 5. 5.100 / 5. 5.100libswresample 3. 5.100 / 3. 5.100libpostproc 55. 5.100 / 55. 5.100 [dshow @ 003df800] DirectShow video device options (from video devices) [dshow @ 003df800] Pin "Capture" (alternative pin name "1") [dshow @ 003df800] pixel_format=bgr0 min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=bgr0 min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=bgr24 min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=rgb555le min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=rgb555le min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=rgb8 min s=1x1 fps=0.02 max s=1920x1080 fps=30 [dshow @ 003df800] pixel_format=yuv420p min s=1x1 fps=0.02 max s=1920x1080 fps=30 leaving aero onvideo=screen-capture-recorder: Immediate exit requested

音頻可設參數查看：
ffmpeg -f dshow -list_options true -i audio="virtual-audio-capturer“

最大最小值一樣，沒啥可以設置的 [dshow @ 00a7f800] DirectShow audio only device options (from audio devices) [dshow @ 00a7f800] Pin "Capture Virtual Audio Pin" (alternative pin name "1") [dshow @ 00a7f800] min ch=2 bits=16 rate= 44100 max ch=2 bits=16 rate= 44100 audio=virtual-audio-capturer: Immediate exit requested

2、指定參數錄制

修改錄制的分辨率、幀率、顏色空間、碼率、編碼的格式：

ffmpeg -f dshow -i audio="virtual-audio-capturer" -f dshow -video_size 1920x1080 -framerate 15 -pixel_format yuv420p -i video="screen-capture-recorder" -b:v 3M -vcodec libx264 -y av-out.flv###-framerate 15屬于采集修改為15幀-i video="screen-capture-recorder" -b:v 3M -vcodec libx264 -r 15 -y av-out.flv 這里的-r屬于編碼成15幀

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