您可以發送數據流的信息與此命令到stdout:
rtmpdump -v -m6 -B6 -r "rtmp://#{URL}" -o /tmp/test.flv &> /tmp/rtmpdump.info; cat /tmp/rtmpdump.info
這將嘗試只錄制6秒的視頻並顯示結果。如果流正在運行,將輸出類似:
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
如果流不運行/失敗,將輸出類似:
RTMPDump v2.4
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
ERROR: Closing connection: NetStream.Play.Failed
下面是用取自公共RTMP流的工作示例VLCStreamTester:
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
從這裏紅寶石您可以輕鬆地檢查一個流是否處於活動狀態(讀爲關鍵字的輸出),然後決定用記錄或不通常的rtmpdump命令。在此之後,您可以構建更多邏輯並通過一組URL來循環,而不是一個URL,從而獲得所需的自動化。
這是一種通過Red5媒體服務器進行信號檢測的方式。另外我認爲你也可以在VLC過程中設置監聽器。我無法提供詳細信息,因爲我從來沒有這樣做過,但我在兩套文檔中都看到了與此相關的內容。希望有所幫助 – Alex 2012-03-17 21:39:28