问题描述
我知道如何使用色度键/绿屏过滤视频流的背景，并使用v4l2loopback将其替换为图像。跑步后
.hex{
cursor: pointer;
}
.hex:hover > * {
transition: all 0.5s ease-in-out;
transform: scaleZ(5);
}我的代码如下：
<svg viewBox="0 0 200 200" version="1.1" xmlns="http://www.w3.org/2000/svg">
<defs>
<g id="pod">
<polygon stroke="#ffffff" stroke-width=".5" points="6,-15 -6,-15 -12,0 -6,15 6,15 12,0" />
</g>
</defs>
<g class="hex">
<use xlink:href="#pod" x="50" y="41" fill="#96ddff"/>
<image xlink:href="https://placeholder.pics/svg/12" x="44" y="35" width="12" height="12"/>
</g>
</svg>然后，我只需在我喜欢的任何视频播放应用中选择新的伪网络摄像头作为输入即可。
我想要一个简短的视频，而不是静止图像，在背景中不断循环播放。我很确定这是可能的，但不知道如何实现，任何提示将不胜感激！
更新1 ：根据要求，这是响应中建议的命令的完整日志
$ sudo modprobe v4l2loopback
更新2 ：通过
应用更新后$ ffmpeg -i background.jpg -f v4l2 -pix_fmt mjpeg \
-framerate 30 -video_size 1280x720 -i /dev/video0 \
-filter_complex \
"[0:v]scale=1280x720[bg]; \
[1:v]colorkey=0x00b140:0.5:0.0[ckout];
[bg][ckout]overlay" \
-pix_fmt yuv420p -f v4l2 /dev/video1
我现在安装了以下版本
$ ffmpeg -stream_loop 5 -re -i some_gif.gif \
-f v4l2 -pix_fmt mjpeg -framerate 30 \
-video_size 1280x720 -i /dev/video0 \
-filter_complex \
"[0:v]scale=1280x720[bg]; \
[1:v]colorkey=0x61A051:0.3:0.0[ckout]; \
[bg][ckout]overlay" \
-pix_fmt yuv420p -f v4l2 /dev/video1
ffmpeg version 3.4.8-0ubuntu0.2 copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
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
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0,gif,from 'some_gif.gif':
Duration: N/A,bitrate: N/A
Stream #0:0: Video: gif,bgra,640x640,10 fps,10 tbr,100 tbn,100 tbc
Input #1,video4linux2,v4l2,from '/dev/video0':
Duration: N/A,start: 433330.420280,bitrate: N/A
Stream #1:0: Video: mjpeg,yuvj422p(pc,bt470bg/unkNown/unkNown),1280x720,30 fps,30 tbr,1000k tbn,1000k tbc
Stream mapping:
Stream #0:0 (gif) -> scale
Stream #1:0 (mjpeg) -> colorkey
overlay -> Stream #0:0 (rawvideo)
Press [q] to stop,[?] for help
[swscaler @ 0x563d17c69e80] deprecated pixel format used,make sure you did set range correctly
[swscaler @ 0x563d17c69e80] No accelerated colorspace conversion found from yuv422p to argb.
Output #0,to '/dev/video1':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449),yuv420p,q=2-31,110592 kb/s,10 tbn,10 tbc (default)
Metadata:
encoder : Lavc57.107.100 rawvideo
Past duration 0.899986 too largeN/A time=00:00:05.10 bitrate=N/A speed= 1x
frame= 98 fps= 10 q=-0.0 Lsize=N/A time=00:00:09.80 bitrate=N/A dup=0 drop=20 speed=1.03x
video:132300kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unkNown
现在答案起作用了：）
解决方法
由于您正在流式传输，请使用-stream_loop进行循环播放，并使用-re以获得实时速度（否则它将播放得非常快）：
$ ffmpeg -stream_loop -1 -re -i input.mp4 -f v4l2 -pixel_format mjpeg \
-framerate 30 -video_size 1280x720 -i /dev/video0 \
-filter_complex \
"[0:v]scale=1280x720[bg]; \
[1:v]colorkey=0x00b140:0.5:0.0[ckout];
[bg][ckout]overlay,format=yuv420p" \
-f v4l2 /dev/video1