[streaming] Re: Problems streaming certain MPEGS [Computer Assets#42]

[Jesse Burson]

> -----Original Message-----
> From: Jean-Paul Saman [mailto:saman at natlab.research.philips.com] 
> Sent: Tuesday, October 07, 2003 1:20 AM
> To: streaming at videolan.org
> Subject: [streaming] Re: Problems streaming certain MPEGS 
> [Computer Assets#42]
> 
> 
> Jesse Burson wrote:
> > I'm not sure if this is even a VLC issue, but it's worth a shot.
> Let's try some testing then. Could you try to stream one of the files 
> using unicast over the network?

Same problem - the switch's RX light for the sending computer's port,
and
the TX lights for every other port, do not light up for most files, but
they
do for certain files (well, for unicast, only the lights for the port
into
which the destination machine is plugged actually light up).

> > Symptoms: Various MPEG files are being sent to multicast 
> addresses via
> > VLC, to be received by other machines running VLC. In some cases,
> > *depending on the file played*, the switch is not getting 
> anything from
> > the sending machine.  In other cases, some initial info 
> about the video
> > is sent but the video itself is not.
> Are all the machines receiving at the same time? Or is only one doing 
> the receiving?

Under multicast, all machines receive at the same time.

> > Additional info: All computers are able to play all videos 
> locally with
> > all versions of VLC, so it isn't a problem with the computers
> > themselves.
> No, it is likely a multicast problem on your network.

Originally I was using a different switch (Dell PowerConnect).  It
wouldn't
do multicast correctly - occasional bits of data here and there.  Now,
with
the Cajun, some videos (so far, only videos recorded by XP machines from
DVDs) multicast just fine, so it isn't a problem with the network (the
network
isn't uplinked; it's just these test machines and the switch).  If it
were a
problem with the network, it wouldn't be dependant on which file is
played.

> > Is there some subtype of MPEG?  Why would certain MPEGs which play
> > locally not be multicastable?  Why would a subset of those 
> only be multicastable
> > from Windows machines?  How can I ensure that I'm creating 
> content which
> > will be multicastable from any machine?
> 
> 
> Sending with VLC should make sure that the video is streamable. Could 
> you try first to stream it with unicast instead? So we can 
> rule out if 
> it is likely to be related with VLC or the network.

The videos that worked in multicast work in unicast.  The videos that
didn't
work in multicast don't work in unicast.

Thank you very much, by the way, for your questions and suggestions.

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