VLC seems to filter on ip destination address

Discussion about configuration and usage of VLM (a stream scheduler) within VLC.
yohann.martineau
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VLC seems to filter on ip destination address

Postby yohann.martineau » 09 Apr 2008 17:41

hello,

I'm performing some tests on vlc (recompiled vlc0.8.6e version on debian) launched as a vod server with an http interface.

Here is how i launch my vlc server (as a non-privileged user):

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./vlc -I http --rtsp-host 0.0.0.0:5554
I use the following url format to launch commands on my vlc instance:

http://$vlc_host:$vlc_http_port/requests/vlm_cmd.xml?command=

I create a vod that streams raw udp packets to a unicast address.

Now, here is the problem:

when I create several vods towards the same ip address but using different port numbers, the network traffic does not increase linearly, i.e. the bitrate is approximatively 3 Mb/s while my input file has a 2.8Mb/s bitrate. For one vod it would be ok but for several vods, that's quite odd.

when I create one vod on a first computer and a second vod from a second computer, I don't have this problem. The output traffic from my vlc server is around 6 Mb/s.

Did anyone already see this problem ?

I will try to stream several vods to the same host using several ip addresses for this host (using several virtual interfaces) and I will see if it's just a filter on destination ip address. I would like to add that vlc does not return any error on http requests. I mean the result is always an xml file containing <error></error> without any inner content:

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HTTP/1.0 200 OK Content-type: text/xml; charset=UTF-8 Cache-Control: no-cache Connection: Keep-Alive Content-Length: 96 <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <vlm> <error></error> </vlm>
Best Regards,

yohann

yohann.martineau
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Re: VLC seems to filter on ip destination address

Postby yohann.martineau » 10 Apr 2008 11:32

I would like to apologize, I have performed more (... and probably better) tests. There is no filter on destination ip address. Yesterday, I found that a bit strange... I did not understand why such a filter would have been implemented... now it's ok !
I have done one test with virtual interfaces and same port for destination and one test without virtual interfaces (only one ip destination address) and the result is the same.


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