我正在使用ffmpeg抓屏。它曾经在Win7下使用UScreenCapture和virtual-audio-capturer（所有x86版本）运行良好。在win10上，不会记录音频。 （播放时我听不到声音）。我正在使用ffmpeg / uscreencapture / virtual-audio-capturer所有的win32版本，因为virtual-audio-capturer没有x64版本。
所以我的问题是：如何使用ffmpeg正确记录视频和音频？
这是屏幕转储： 首先是我系统上的直接显示设备
C:\ffmpeg-20190403-ee16d14-win32-static\bin>ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version N-93528-gee16d14b0a Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20190212
configuration: --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-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-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-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 48.101 / 58. 48.101
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
[dshow @ 06303ac0] DirectShow video devices (some may be both video and audio devices)
[dshow @ 06303ac0] "UScreenCapture"
[dshow @ 06303ac0] Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\UScreenCapture"
[dshow @ 06303ac0] DirectShow audio devices
[dshow @ 06303ac0] "Microphone Array (Realtek(R) Audio)"
[dshow @ 06303ac0] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{9F102091-1843-44C8-B20E-C6F2E0F11A0F}"
[dshow @ 06303ac0] "virtual-audio-capturer"
[dshow @ 06303ac0] Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E14549B-DB61-4309-AFA1-3578E927E935}"
dummy: Immediate exit requested
2，当我使用虚拟音频捕获器时，ffmpeg只是失败了：
C:\ffmpeg-20190403-ee16d14-win32-static\bin>ffmpeg -f dshow -i video="UScreenCapture":audio="Microphone Array (Realtek(R) Audio)" -vf crop=1075:717:189:81 -vcodec mpeg4 -qscale 0 -framerate 60 -acodec libmp3lame -ab 128000 -async 1 output.aviffmpeg -f dshow -i video="UScreenCapture":audio="virtual-audio-capturer" -vf crop=1075:717:189:81 -vcodec mpeg4 -qscale 0 -framerate 60 -acodec libmp3lame -ab 128000 -async 1 output.avi
ffmpeg version N-93528-gee16d14b0a Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20190212
configuration: --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-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-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-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 48.101 / 58. 48.101
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=UScreenCapture:audio=Microphone Array (Realtek(R) Audio)':
Duration: N/A, start: 6333.289000, bitrate: N/A
Stream #0:0: Video: rawvideo, bgr24, 3200x1080, 15 fps, 15 tbr, 10000k tbn, 10000k tbc
Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
IMMDeviceEnumerator::GetDefaultAudioEndpoint failed: hr = 0x80070490
[dshow @ 062f4ac0] real-time buffer [UScreenCapture] [video input] too full or near too full (340% of size: 3041280 [rtbufsize parameter])! frame dropped!
当我使用其他音频设备时，它似乎可以工作，但是没有录制音频：
ffmpeg -f dshow -i video="UScreenCapture":audio="Microphone Array (Realtek(R) Audio)" -vf crop=1075:717:189:81 -vcodec mpeg4 -qscale 0 -framerate 60 -acodec libmp3lame -ab 128000 -async 1 output.avi
C:\ffmpeg-20190403-ee16d14-win32-static\bin>ffmpeg -f dshow -i video="UScreenCapture":audio="Microphone Array (Realtek(R) Audio)" -vf crop=1075:717:189:81 -vcodec mpeg4 -qscale 0 -framerate 60 -acodec libmp3lame -ab 128000 -async 1 output.avi
ffmpeg version N-93528-gee16d14b0a Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20190212
configuration: --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-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-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-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 48.101 / 58. 48.101
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=UScreenCapture:audio=Microphone Array (Realtek(R) Audio)':
Duration: N/A, start: 6168.067000, bitrate: N/A
Stream #0:0: Video: rawvideo, bgr24, 3200x1080, 15 fps, 15 tbr, 10000k tbn, 10000k tbc
Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Please use -q:a or -q:v, -qscale is ambiguous
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Stream #0:1 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
Output #0, avi, to 'output.avi':
Metadata:
ISFT : Lavf58.26.101
Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p(progressive), 1075x717, q=2-31, 200 kb/s, 15 fps, 15 tbn, 15 tbc
Metadata:
encoder : Lavc58.48.101 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s
Metadata:
encoder : Lavc58.48.101 libmp3lame
frame= 8 fps=0.0 q=0.0 size= 522kB time=00:00:00.53 bitrate=8013.1kbitsframe= 16 fps= 16 q=0.0 size= 1034kB time=00:00:01.06 bitrate=7938.7kbitsframe= 23 fps= 15 q=0.0 size= 1546kB time=00:00:01.53 bitrate=8258.0kbitsframe= 31 fps= 15 q=0.0 size= 2058kB time=00:00:02.06 bitrate=8156.4kbitsframe= 38 fps= 15 q=0.0 size= 2058kB time=00:00:02.53 bitrate=6653.9kbitsframe= 46 fps= 15 q=0.0 size= 2570kB time=00:00:03.06 bitrate=6864.4kbitsframe= 54 fps= 15 q=0.0 size= 3082kB time=00:00:03.60 bitrate=7012.6kbitsframe= 61 fps= 15 q=0.0 size= 3338kB time=00:00:04.06 bitrate=6723.5kbitsframe= 69 fps= 15 q=0.0 size= 3850kB time=00:00:04.60 bitrate=6855.8kbitsframe= 76 fps= 15 q=0.0 size= 4106kB time=00:00:05.06 bitrate=6638.2kbitsframe= 84 fps= 15 q=0.0 size= 4618kB time=00:00:05.60 bitrate=6755.0kbitsframe= 91 fps= 15 q=0.0 size= 4874kB time=00:00:06.06 bitrate=6581.1kbitsframe= 99 fps= 15 q=0.0 size= 5130kB time=00:00:06.60 bitrate=6367.0kbitsframe= 106 fps= 15 q=0.0 size= 5642kB time=00:00:07.06 bitrate=6540.1kbitsframe= 114 fps= 15 q=0.0 size= 6154kB time=00:00:07.66 bitrate=6575.3kbitsframe= 121 fps= 15 q=0.0 size= 6410kB time=00:00:08.13 bitrate=6455.9kbitsframe= 129 fps= 15 q=0.0 size= 6666kB time=00:00:08.66 bitrate=6300.6kbitsframe= 136 fps= 15 q=0.0 size= 6922kB time=00:00:09.13 bitrate=6208.3kbitsframe= 144 fps= 15 q=0.0 size= 7434kB time=00:00:09.66 bitrate=6299.7kbitsframe= 151 fps= 15 q=0.0 size= 7690kB time=00:00:10.13 bitrate=6216.5kbitsframe= 159 fps= 15 q=0.0 size= 7946kB time=00:00:10.66 bitrate=6102.3kbitsframe= 167 fps= 15 q=0.0 size= 8458kB time=00:00:11.20 bitrate=6186.2kbitsframe= 174 fps= 15 q=0.0 size= 8970kB time=00:00:11.66 bitrate=6298.3kbitsframe= 182 fps= 15 q=0.0 size= 8970kB time=00:00:12.20 bitrate=6022.9kbitsframe= 189 fps= 15 q=0.0 size= 9482kB time=00:00:12.66 bitrate=6132.2kbitsframe= 190 fps= 15 q=0.0 Lsize= 9602kB time=00:00:12.73 bitrate=6177.3kbits/s speed= 1x
video:9382kB audio:194kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.265721%
[dshow @ 06393f40] real-time buffer [UScreenCapture] [video input] too full or near too full (340% of size: 3041280 [rtbufsize parameter])! frame dropped!
Exiting normally, received signal 2.
答案 0 :(得分：0)
我终于在Windows 10下解决了这个问题： 麦克风只能从空中获取声音，这可能会捕获不想要的声音，并且质量可能不佳。幸运的是，我们有替代解决方案：
打开声音设置，添加了两个设备：用于回放的电缆输入和用于记录的电缆输出
将这两个设备设为默认设备
之后，通过运行以下命令转到ffmpeg： ffmpeg -list_devices -f dshow -i虚拟 将显示以下设备名称： “音频电缆输出（VB音频虚拟电缆）”
将此设备用作音频捕获设备，即可解决问题。