使用 ffmpeg 录屏
Table of Contents
1 Windows
使用 Windows 自带的 GDI screengrabber 录屏非常方便。
1.1 列出使用的设备信息
ffmpeg -list_devices true -f dshow -i dummy
在我的 Windows 7 下面信息如下：
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100 [dshow @ 0000000000567740] DirectShow video devices (some may be both video and audio devices) [dshow @ 0000000000567740] Could not enumerate video devices (or none found). [dshow @ 0000000000567740] DirectShow audio devices [dshow @ 0000000000567740] Could not enumerate audio only devices (or none found). dummy: Immediate exit requested
1.2 录取整个屏幕
ffmpeg -f gdigrab -framerate 30 -i desktop output.mkv
1.3 录取部分屏幕
ffmpeg -f gdigrab -framerate 30 \ -offset_x 10 -offset_y 20 \ -video_size 1280x720 -show_region 1 \ -i desktop output.mkv
2 macOS
mac 下使用 avfoundation 设备可以快速地录屏
2.1 列出所有设备
ffmpeg -f avfoundation -list_devices true -i ""
在我的 macbook 上的输出设备如下：
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 9.1.0 (clang-902.0.39.2) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 [AVFoundation input device @ 0x7f84f7c004c0] AVFoundation video devices: [AVFoundation input device @ 0x7f84f7c004c0] [0] FaceTime HD Camera [AVFoundation input device @ 0x7f84f7c004c0] [1] Capture screen 0 [AVFoundation input device @ 0x7f84f7c004c0] AVFoundation audio devices: [AVFoundation input device @ 0x7f84f7c004c0] [0] MI Portable Bluetooth Speaker [AVFoundation input device @ 0x7f84f7c004c0] [1] Built-in Microphone : Input/output error
2.2 录制整个屏幕
<screen device index> 和 <audio device index> 参考设备的编号
ffmpeg -f avfoundation -i "<screen device index>:<audio device index>" output.mkv