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我有一个在 RTSP 中获得的相机源，例如：rtsp://172.16.1.177:8554/test

这是我使用的流详细信息ffmpeg -i rtsp://172.16.1.177:8554/test

Input #0, rtsp, from 'rtsp://172.16.1.177:8554/test':
  Metadata:
    title           : Session streamed with GStreamer
    comment         : rtsp-server
  Duration: N/A, start: 0.710544, bitrate: N/A
    Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1920x1080, 15 tbr, 90k tbn, 180k tbc

现在，我将 chromakey 应用到上面的流中，这给了我完美的 mp4 输出

ffmpeg -i background.jpg -i rtsp://172.16.1.177:8554/test -filter_complex "[1:v]colorkey=0x26ff0b:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mp4

之后，我使用以下配置文件创建并成功启动了 ffserver

HTTPPort 8091
RTSPPort 8092
HTTPBindAddress 0.0.0.0
<Feed feed1.ffm>
    File /tmp/feed1.ffm
    FileMaxSize 2048M
    ACL allow localhost
</Feed>
<Stream live.sdp>
    Feed feed1.ffm
    Format rtp
    NoAudio
    VideoCodec libx264
    VideoFrameRate 15
    VideoBitRate 1000
    VideoSize 1920x1080
    ACL allow 172.16.1.30 172.16.0.2
</Stream>

我正在尝试使用以下命令导出输出流

ffmpeg -i background.jpg -i rtsp://172.16.1.177:8554/test -filter_complex "[1:v]colorkey=0x26ff0b:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" http://localhost:8091/feed1.ffm

这给了我以下错误

Input #0, image2, from 'background.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 23866 kb/s
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 854x480 [SAR 72:72 DAR 427:240], 25 tbr, 25 tbn, 25 tbc
Input #1, rtsp, from 'rtsp://172.16.1.177:8554/test':
  Metadata:
    title           : Session streamed with GStreamer
    comment         : rtsp-server
  Duration: N/A, start: 0.711933, bitrate: N/A
    Stream #1:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1920x1080, 15 tbr, 90k tbn, 180k tbc
[tcp @ 0x7fdb88706680] Connection to tcp://localhost:8091 failed (Connection refused), trying next address
[tcp @ 0x7fdb88402920] Connection to tcp://localhost:8091 failed (Connection refused), trying next address
Filter overlay has an unconnected output

我对 ffmpeg 或 ffserver 都没有太多经验，所以我不完全知道为什么会出现未连接输出的问题

过滤器覆盖有一个未连接的输出

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