ruby-on-rails – 监视RTMP流,记录是否可用

rtmpdump -v -m6 -B6 -r "rtmp://#{URL}" -o /tmp/test.flv &> /tmp/rtmpdump.info; cat /tmp/rtmpdump.info

这将尝试记录仅6秒的视频并显示结果.如果流正在运行,它将输出如下内容：

INFO: Connected...
Starting Live Stream
For duration: 6.000 sec
INFO: Metadata:
INFO: trackinfo:
INFO:   timescale             50000.00
INFO:   length                19686000.00
INFO:   language              eng
INFO: sampledescription:
INFO:   sampletype            avc1
INFO:   timescale             48000.00
INFO:   length                18900992.00
INFO:   language              eng
INFO: sampledescription:
INFO:   sampletype            mp4a
INFO:   audiochannels         2.00
INFO:   audiosamplerate       48000.00
INFO:   videoframerate        25.00
INFO:   aacaot                2.00
INFO:   avclevel              31.00
INFO:   avcprofile            77.00
INFO:   audiocodecid          mp4a
INFO:   videocodecid          avc1
INFO:   width                 1047.00
INFO:   height                576.00
INFO:   frameWidth            720.00
INFO:   frameHeight           576.00
INFO:   displayWidth          1047.00
INFO:   displayHeight         576.00
INFO:   framerate             25.00
INFO:   moovposition          32.00
INFO:   duration              393.77
2033.613 kB / 6.02 sec (1.5%)
Download may be incomplete (downloaded about 1.50%),try resuming

如果流未运行/失败,它将输出如下内容：

RTMPDump v2.4
(c) 2010 Andrej Stepanchuk,Howard Chu,The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
ERROR: Closing connection: NetStream.Play.Failed

这是一个从VLCStreamTester获取的公共rtmp流的工作示例：

require 'open3'

rtmp_url    = "stream.streetclip.tv:1935/live/high-stream"
command     = "rtmpdump -v -m6 -B6 -r "rtmp://#{rtmp_url}" -o /tmp/test.flv &> /tmp/rtmpdump.info; cat /tmp/rtmpdump.info"

Open3.popen3(command) do |i,o,e,t|
  puts o.read
end

从这里使用ruby,您可以轻松检查一个流是否处于活动状态(读取关键字的输出),然后决定是否使用通常的rtmpdump命令进行记录.在此之后,您可以构建更多逻辑并循环遍历URL数组而不是单个URL,从而获得所需的自动化.