[streaming] Re: multicasting rtsp stream

[Scott Hanson]

Thanks, BigBen.

This is how I describe my scenario:

Computer A receives a rtsp stream and plays clearly.
when I unicast from Computer A, Computer A still plays normally.
When I try to multicast from Computer A, Computer A displays a lot of garbage. (dropped frames and libdvbpsi errors)


How do I increase the receive buffer?

Thanks,

Scott Hanson

>>> bigben+spam at videolan.org 10/19/05 11:10 AM >>>
Le mercredi 19 octobre 2005 à 09:55 -0400, Scott Hanson a écrit :
> I am receiving a rtsp stream over our high bandwidth WAN.  I comes in crystal clear on both Windows (vlc 8.4-test1) and Gentoo 2.6.11 (VLC version snapshot-20051002 Janus.)   When I do a Unicast to a client, the stream is fine.  When I try to start a multicast stream, the server loses frames and I get a lot of libdvbpsi out of sequence errors on both Windows and Gentoo.  Multicasting from two PVR-250s works just fine.
> 
> I used the binary for Windows and compiled Gentoo with './configure --enable-x11 --enable-xvideo --disable-gtk --enable-sdl --enable-ffmpeg --with-ffmpeg-mp3lame --enable-mad --enable-libdvbpsi --enable-a52 --enable-dts --enable-libmpeg2 --enable-dvdnav --enable-faad --enable-vorbis --enable-ogg --enable-theora --enable-faac --enable-mkv --enable-freetype --enable-fribidi --enable-speex --enable-flac --enable-livedotcom --with-livedotcom-tree=/usr/lib/live --enable-caca --enable-skins --enable-skins2 --enable-alsa --disable-kde --disable-qt --enable-wxwindows --enable-ncurses --enable-release --enable-pvr'
> 
> Does any one have any ideas?
> 

I guess WAN stands for Wide Area Network here, not Wireless LAN ?

What is the source in the case it doesn't work ? (you seem to say
everything is ok with PVRs...) The fact you get issues only with
multicasting could be related to the fact your multicast routers either
create a lot of jitter or forward UDP packets out of order. A RTP
reordering mecanism will be included in VLC in 0.8.4 (or soon after the
release). That could Help. You can also try to increase the receive
buffer, or use a packet capture to check wether packets are
trashed/arrive with jitter/out of order...

-- 
BigBen

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