如何使用ffmpeg命令生成RTMP测试流？

我想通过生成带有时间戳的 RTMP 测试视频来测试我的流媒体基础设施。这可能看起来像那样screen https://s-media-cache-ak0.pinimg.com/originals/65/25/9c/65259ca7ebaba595368c666c08b69aee.jpg。图像并不重要。我正在追寻工作流即时生成和仅时间戳。我打算使用ffmpeg用于此目的的工具。该命令可能类似于

$ ffmpeg -i image.png \
    -vf drawtext="fontfile=/Library/Fonts/Arial.ttf: \
        timecode='00\:00\:00\:00': r=1: fontcolor=white: \
        fontsize=24: box=1: [email protected] /cdn-cgi/l/email-protection: \
        boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2" \
    -f flv rtmp://localhost/live/test

我在本地运行流媒体服务器 https://github.com/codeworksio/docker-streaming-server基于NGINX及其RTMP模块。

但是，上面的命令给了我以下错误：

Input #0, png_pipe, from 'image.png':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 768x576 [SAR 7874:7874 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> flv1 (flv))
Press [q] to stop, [?] for help
[Parsed_drawtext_0 @ 0x7fb78450ece0] Using non-standard frame rate 1/1
Output #0, flv, to 'rtmp://localhost/live/test':
  Metadata:
    encoder         : Lavf57.71.100
    Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 768x576 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.89.100 flv
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[flv @ 0x7fb785812a00] Failed to update header with correct duration.
[flv @ 0x7fb785812a00] Failed to update header with correct filesize.
frame=    1 fps=0.0 q=8.6 Lsize=      50kB time=00:00:00.00 bitrate=406016.0kbits/s speed=0.019x
video:49kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.451271%

流媒体服务器按预期运行。问题出在命令上。有人能帮助我吗？

ffmpeg 有testsrc您可以用作测试源输入流：

ffmpeg -r 30 -f lavfi -i testsrc -vf scale=1280:960 -vcodec libx264 -profile:v baseline -pix_fmt yuv420p -f flv rtmp://localhost/live/test

-r、缩放、轮廓等只是示例并且可以被省略/使用。重点是使用-i testsrc