Okay, I've played around with the TCP parameters on my Ubuntu 12.10 box.
I've uploaded a script to my dropbox account that tweaks a number of TCP
parameters in Ubuntu. Most notably I've increased the receive buffer
from 128K to 4MB. Obviously you can tweak this value to suit your
available memory. The script needs to be run via sudo as the tweaks need
root privileges.
http://dl.dropbox.com/u/32483061/set_buffer_size
I'm still testing, but it does seem to improve matters with the stock
rtmpdump, so good idea dinkypumpkin!
Cheers
Neill.
On 08/01/13 17:00, [email protected] wrote:
------------------------------
Message: 3
Date: Tue, 08 Jan 2013 14:36:37 +0000
From: dinkypumpkin <[email protected]>
To: [email protected]
Subject: Re: Stream corrupt error and then rtmpdump goes nuts
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
There is already some flow control in rtmpdump in the sense that it uses
the RTMP mechanism for negotiating bandwidth. Still, that won't matter
much when you receive garbage data, as appeared to be the case in your
initial report. If there is garbage data in a RTMP message, it means
that either the server send garbage, or some packets were lost, possibly
as a result of socket buffer overflows. You would hope that TCP flow
control would prevent the latter, but there is no way to know what's
going at the server end of the connection. Still, I can't help but
wonder if amending rtmdump is attacking the problem from the wrong end.
Perhaps it might be better to start with adjusting networking
parameters on your system. I looked at a vanilla Ubuntu 12.10 and found
the max socket receive buffer size is 128KiB. I wouldn't be at all
surprised if that was too small for 30Mb+ connections. If anyone with a
fibre connection is bored enough to do some experimentation, it would be
interesting to see if some TCP tuning could solve the problem.
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