原因
使用 ffmpeg 的 dshow 输入命令 ffmpegd -f dshow -list_devices true -i dummy，会列出所有可用设备。
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ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
built with msvc
configuration: --enable-gpl --enable-version3 --enable-bzlib --enable-iconv --enable-lzma --enable-sdl2 --enable-zlib --enable-libmp3lame --enable-libvorbis --enable-libspeex --enable-libopus --enable-libilbc --enable-libtheora --enable-libx264 --enable-libx265 --enable-libxvid --enable-libvpx --enable-libgme --enable-libmodplug --enable-libsoxr --enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-libharfbuzz --enable-libass --enable-libxml2 --enable-gnutls --disable-schannel --enable-gcrypt --enable-libssh --enable-libcdio --enable-libbluray --enable-opengl --enable-libmfx --enable-ffnvcodec --enable-cuda --enable-amf
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.100 / 61. 19.100
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
[dshow @ 0000027C64A3F480] "screen-capture-recorder" (video)
[dshow @ 0000027C64A3F480] Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA69364-2C8A-4AE6-A561-56E4B5044439}"
[dshow @ 0000027C64A3F480] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{FFCCBAEC-584E-4AC0-8CC4-2FA45D55527B}"
[dshow @ 0000027C64A3F480] "virtual-audio-capturer" (audio)
[dshow @ 0000027C64A3F480] Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E146464-DB61-4309-AFA1-3578E927E935}"
[in#0 @ 0000027C64A3F200] Error opening input: Immediate exit requested
Error opening input file dummy.
然后输入命令 ffmpeg -f dshow -i video="screen-capture-recorder" -t 5 output.mp4 录制屏幕提示失败。
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[dshow @ 000001529B3FEF80] Could not enumerate video devices (or none found).
[in#0 @ 000001529B408FC0] Error opening input: I/O error
Error opening input file video=screen-capture-recorder.
Error opening input files: I/O error
解决：
卸载 screen-capture-recorder 之后从 GitHub 上重新下载安装一下就好了。
