[vlc-devel] Streaming MRL issue: MRL incorrectly created via GUI?

[Claudio Allocchio]

Hello all,

as it seems now that we have a new group of OSX developers on board, I 
just re-submit a couple of minor issues we identified when there were no 
developers.

The first one is about the GUI which makes a wrong MRL... see below.

On Mon, 14 Dec 2009, Claudio Allocchio wrote:

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> gpg: Good signature from "Claudio Allocchio <Claudio.Allocchio at garr.it>"
> gpg:                 aka "Claudio Allocchio 
> <Claudio.Allocchio at elettra.trieste.it>"
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>
> Hello all,
>
> VLC has always been the "preferred" tool used by a large community in order 
> to receive and display the good and high quality streamed generated
> by DVTS and HDVTS encoders ( http://www.sfc.wide.ad.jp/DVTS/ ) both in 
> unicast and multicast mode.
>
> Since VLC v1.0 was out, both for OSX and XP platforms, we detected a problem 
> in VLC when it generates the streaming MRL using its embedded GUI; the 
> problem makes users think of something related to the streaming itself. On 
> the other end, the problem does not exist if the MRL is entered manually. 
> Thus it is simply a badly automatically generated MRL from the GUI.
>
> Here are the details for OSX (see below for XP).
>
> In OSX versions 1.0.1, 1.0.2 and 1.0.3 (pretty the same) after "Open 
> Network..." the only way to enter the correct MRL is by opening the Media 
> Resource Locator (MRL) tag explicitly, and type in the correct complete 
> value, for example
>
>  rtp://@233.45.17.248:1234
>
> whichever other combination entered via the GUI (selecting "Open RTP/UDP 
> Stream" button and filling in the GUI form) produces the wrong MRL
>
>  RTP Multicast IP Address 233.45.17.248 Port 1234
>    produces the MRL rtp://@233.45.17.248   ! ":1234" is missing !
>
>  UDP Multicast IP Address 233.45.17.248 Port 1234
>    produces the MRL udp://@233.45.17.248   ! ":1234" is missing !
>
> NOTE: without the ":1234" VLC does not join correctly the multicast stream, 
> even if "1234" is the default port. It seems that ":1234" must be present in 
> any case explicitly in the MRL, but the GUI does not generate it. If the port 
> is any different number, then the GUI correctly adds it.
>
> For Unicast the complete correct URL is: rtp://@:port and udp://@:port. The 
> GUI generates:
>
>  RTP Unicast Port 1234
>    produces the MRL rtp://   ! "@:1234" is missing !
>
>  UDP Unicast Port 1234
>    produces the MRL udp://   ! "@:1234" is missing !
>
> NOTE: without the "@:1234" VLC does not start receiving correctly the stream 
> if RTP is used. On the other hand, if UPD is used, then VLC received 
> correctly ALSO without the "@:1234" in the MRL. If the port is different from 
> "1234", then the GUI generates correct complete MRLs.
>
> Windows XP version, UNICAST:
>
> VLC any version:
>
> The default "Open network stream..." menu does not work both with udp and
> rtp protocols selected, unless you insert 0.0.0.0 as network address, in 
> order to create the MRL
>
> rtp://0.0.0.0:1234
>
> or
>
> udp://0.0.0.0:1234
>
> e.g. the unicast receiving stream ONLY works if a 0.0.0.0 IP address is added 
> to the MRL.
>
> In order to reproduce this, you just need the following:
>
> - connect an HDV camera to HDVTS (best if you use the Windows XP version)
>   and start streaming whichever you like either in multicast or unicast;
>
> - use VLC to try to receive the stream (multicast or unicast)
>   accordingly.
>
> IF, as it looks like, this is a buggy imolementation of the latest VLC "Open 
> Network..." MRL generator via the GUI, I guess it should be fixed ASAP. 
> user's are not able to distiguish these subtle differences in MRLs, and get 
> confused, resulting unable to receive streams.
>
> thanks... and best regards
>
> PS: there is yet another interaction issue between HDVTS and VLC, but I'll 
> post it in a separate e-mail.
>
> ------------------------------------------------------------------------------
> Claudio Allocchio             G   A   R   R 
> Claudio.Allocchio at garr.it
>                        Senior Technical Officer
> tel: +39 040 3758523      Italian Academic and       G=Claudio; S=Allocchio;
> fax: +39 040 3758565        Research Network         P=garr; A=garr; C=it;
>
>           PGP Key: http://www.cert.garr.it/PGP/keys.php3#ca
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------------------------------------------------------------------------------
Claudio Allocchio             G   A   R   R          Claudio.Allocchio at garr.it
                         Senior Technical Officer
tel: +39 040 3758523      Italian Academic and       G=Claudio; S=Allocchio;
fax: +39 040 3758565        Research Network         P=garr; A=garr; C=it;

            PGP Key: http://www.cert.garr.it/PGP/keys.php3#ca