Downloading Channel 4 News with rtmpdump

Mick · #1 11-28-2010, 10:19 AM

Hi All,

I have been trying to download a channel4 news bulletin and capture the stream details with rtmpsrv, but if rtmpsrv is running then the video fails to download and play in the browser. The download seems to start (the embedded player shows black) but the video never starts.

The page is this: http://www.channel4.com/news/catch-up/

When I start rtmpsrv I get this output:

Code:

# rtmpsrv 
RTMP Server v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu; license: GPL

Streaming on rtmp://0.0.0.0:1935
WARNING: Trying different position for client digest!

rtmpdump -r "rtmp://brightcove-82.fcod.llnwd.net:1935/a500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -a "a500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -f "LNX 10,1,102,64" -W "http://admin.brightcove.com/viewer/us1.24.03.04.2010-11-19132629/federatedVideoUI/BrightcovePlayer.swf" -p "http://www.channel4.com/news/catch-up/" -C B:0 -C S:mp4:media/1184612030/1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.mp4&1290963600000&93fa72aa482f0cefcf263f1c617234e8 -y "mp4:media/1184612030/1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.mp4?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -o 1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.flv

Closing connection... done!

RTMPDump v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Duplicate request, skipping.
Caught signal: 13, cleaning up, just a second...
ERROR: WriteN, RTMP send error 32 (42 bytes)
Closing connection... done!

ERROR: RTMP_ReadPacket, failed to read RTMP packet header

Running the rtmpdump code as obtained above with rtmpsrv also fails to download the video:

Code:

~ $ rtmpdump -r "rtmp://brightcove-82.fcod.llnwd.net:1935/a500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -a "a500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -f "LNX 10,1,102,64" -W "http://admin.brightcove.com/viewer/us1.24.03.04.2010-11-19132629/federatedVideoUI/BrightcovePlayer.swf" -p "http://www.channel4.com/news/catch-up/" -C B:0 -C S:mp4:media/1184612030/1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.mp4&1290963600000&93fa72aa482f0cefcf263f1c617234e8 -y "mp4:media/1184612030/1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.mp4?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateId=" -o 1184612030_690046737001_4ON-HEADS-27-Brightcove16x9.flv
[1] 12336
[2] 12337
-bash: 1290963600000: command not found
-bash: 93fa72aa482f0cefcf263f1c617234e8: command not found
[2]+  Exit 127                1290963600000
~ $ RTMPDump v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
WARNING: You haven't specified an output file (-o filename), using stdout
Connecting ...
INFO: Connected...
ERROR: rtmp server sent error
ERROR: rtmp server requested close

BTW, I don't understand the warning about not specifying an output file, as you can see I have specified an output file.

When I close the rtmpsrv and reload the page the video plays normally in the browser.

A tcpflow capture of the connection (when it works without rtmpsrv) shows this:

Code:

(."....>...S...g....H..n.../)ht.....7.. ..O_.H.........a^..E........Kmo..-..(Q..^B+u....1. ..y...G.T.x.
..}-.Quv.R%..z8=..F."...7.Z...vQ.v>=W.....3..r...J.......[h.R.>..Jm6A..-...|]...~.JH.....7..Z...JsF@sX......m.<.$.i.5!-j4.*nD....,.....Mr9..2>.-...W..?.E..B...8@8k.4..(....u...;..F..O...G.#.,.93v.....\..4.Kh..H.U....L%...#.."x.....].p.W.$$.X{..E$..
.....(..{..v..)....Qx...Gb...I.....Y..&..Y{.rpH......q#a8......%dm.....w.SS.......B..!.MH.._.....ji.g..i+._.J.'e....._.7V4w..r.A.%..............W!....Z...<...~.T.W(.>=.)....7.................connect.?..........app..fa500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playerId=601325122001&playerTag=&affiliateI.d=..flashVer...LNX 10,1,102,64..swfUrl..fhttp://admin.brightcove.com/viewer/us1.24.03.04.2010-11-19132629/federatedVideoUI/Brigh.tcovePlayer.swf..tcUrl...rtmp://brightcove-82.fcod.llnwd.net:1935/a500/d12?videoId=690038526001&lineUpId=&pubId=1184612030&playe.rId=601325122001&playerTag=&affiliateId=..fpad....capabilities.@m........audioCodecs.@.........videoCodecs.@o.......
videoFuncti.on.?.........pageUrl..&http://www.channel4.com/news/catch-up/..objectEncoding................{mp4:media/1184612030/1184612030_69.0046737001_4ON-HEADS-27-Brightcove16x9.mp4&1290963600000&93fa72aa482f0cefcf263f1c617234e8..c..........&%.

At some point during the connection to the brightcove server used by Channel 4, my PC connects with SSLv2 to 95.140.226.95. I am not sure if this is some two stage authentication to the brightcove server using TCP and if rtmpdump/rtmpsrv can deal with this negotiation.

Any ideas what I'm missing?
--
Regards,
Mick