我正在嘗試使用 ffmpeg 設定 YouTube 串流，但收到此錯誤「預設：沒有這樣的過程」。
我運行這個命令：
ffmpeg -f x11grab -s 1824x984 -framerate 15 -i :0.0 -f pulse -ac 2 -i default -c:v libx264 -preset fast -pix_fmt yuv420p -s 1280x800 -c:a aac -b:a 160k -ar 44100 -threads 0 -f flv "rtmp://a.rtmp.youtube.com/live2/key"
並得到這樣的回應：
built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
configuration: --prefix=/usr --extra-version='1~deb9u1+rpt1' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --arch=armhf --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
[x11grab @ 0x2211710] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
Duration: N/A, start: 1569634587.235443, bitrate: N/A
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1824x984, 15 fps, 1000k tbr, 1000k tbn, 1000k tbc
default: No such process
我從研究中發現，指向 x11grab 的某些內容可能不準確，但我不確定。這是什麼意思？
答案1
您缺少ffmpeg執行編碼所需的依賴項之一。大概pulseaudio。在 Ubuntu/Debian 上，嘗試
sudo apt-get install pulseaudio