我正在尝试以下命令，以便我的网络摄像头在从网络或 android 模拟器访问时显示视频。
我正在使用 archlinux。我已经安装了v4l2loopback-dkms。并将模块添加到内核中。然后我启动了
gst-launch-0.10 filesrc location=/home/simha/1.3gp ! decodebin2 ! ffmpegcolorspace ! videoscale ! ffmpegcolorspace ! v4l2sink device=/dev/video0
但没有成功。
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Device '/dev/video0' is not a output device.
Additional debug info:
v4l2_calls.c(528): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:
Capabilities: 0x85200001
Setting pipeline to NULL ...
Freeing pipeline ...
还尝试过：
ffmpeg -f x11grab -r 15 -s 1280x720 -i :0.0+0,0 -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0
但不起作用
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-shared --enable-version3 --enable-x11grab
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, x11grab, from ':0.0+0,0':
Duration: N/A, start: 1456374857.672770, bitrate: N/A
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1280x720, 15 fps, 15 tbr, 1000k tbn, 15 tbc
[v4l2 @ 0x55f5129180a0] ioctl(VIDIOC_G_FMT): Invalid argument
Output #0, v4l2, to '/dev/video0':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720, q=2-31, 200 kb/s, 15 fps, 15 tbn, 15 tbc
Metadata:
encoder : Lavc56.60.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
您可能为网络摄像头使用了错误的驱动程序。使用 lsusb 命令识别您的网络摄像头。然后找出您需要什么驱动程序才能使其工作。您可以通过阅读网络摄像头拱门维基页面找到有关此内容的更多信息