Mac OS X - Multicast UDP not working?

Fri Jul 19 20:27:45 CEST 2002

I don't know why exactly VLC expects UDP packets to be < 1500 bytes.  I
suggested (to Christophe, on the VLC team) that they be able to handle
packets up to 64K in size (the UDP limit) but he has not responded yet.  If
you want to recompile the code yourself,  I can point you to the location
where you can increase the limit yourself.

If you change DEFAULT_MTU in plugins/network/ipv4.c to something larger than
3948, it should allow VLC to work properly.

Scott

-----Original Message-----
From: Johnny Turpin [mailto:jturpin at minervanetworks.com] 
Sent: Friday, July 19, 2002 2:14 PM
To: 'vlc at videolan.org'
Subject: RE: Mac OS X - Multicast UDP not working?

This could be the problem. The packet size from our decoder is set to 3948 -
which is configurable, but I am not sure if changing this value will upset
any of the other decoders we are using.

So what exactly is the issue with UDP packet sizes greater than 1500 bytes?
We still keep the ethernet packets at 1500 bytes. So I don't think we are
breaking any network rules...

-----Original Message-----
From: Talbert, Scott [mailto:scott.talbert at lmco.com]
Sent: Friday, July 19, 2002 10:57 AM
To: 'vlc at videolan.org'
Subject: RE: Mac OS X - Multicast UDP not working?

Sounds like you could be facing the same problem I was facing.  Do you know
what size UDP packets your encoder device is putting out onto the network?
By default, VLC is configured to handle UDP packets up to 1500 bytes.

Scott

-----Original Message-----
From: Johnny Turpin [mailto:jturpin at minervanetworks.com] 
Sent: Friday, July 19, 2002 1:47 PM
To: 'vlc at videolan.org'
Subject: RE: Mac OS X - Multicast UDP not working?

> You can try launching VLC using Terminal.app :
> cd vlc-0.4.2
> ./vlc.app/Contents/MacOS/vlc -vvvvvvvvv --stats
> udp:@239.239.239.1:1234
>
ok, here is what the output looks like from the stream that doesn't work:

vlc -vvvvvvvvv --stats udp:@239.255.1.1:3001
--------------------------------------------------------------------------

module: checking built-in modules
module: new builtin module `idct', IDCT module
module: new builtin module `idctclassic', classic IDCT module
module: new builtin module `motion', motion compensation module
module: new builtin module `imdct', AC3 IMDCT module
module: new builtin module `downmix', AC3 downmix module
module: new builtin module `chroma_i420_rgb', I420,IYUV,YV12 to
RGB,RV15,RV16,RV24,RV32 conversions
module: new builtin module `chroma_i420_yuy2', conversions from
I420,IYUV,YV12 to YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv,Y211
module: new builtin module `chroma_i422_yuy2', conversions from I422 to
YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv,Y211
module: new builtin module `chroma_i420_ymga', conversions from
I420,IYUV,YV12 to YMGA
module: new builtin module `mpeg_adec', MPEG I/II layer 1/2 audio decoder
module: new builtin module `ac3_adec', software AC3 decoder
module: new builtin module `mpeg_vdec', MPEG I/II video decoder module
module: new builtin module `idctaltivec', Altivec IDCT module
module: new builtin module `motionaltivec', AltiVec motion compensation
module
module: new builtin module `memcpyaltivec', AltiVec memcpy module
module: new builtin module `ffmpeg', ffmpeg video decoder
(MSMPEG4v123,MPEG4)
module: new builtin module `a52', a52 ATSC A/52 aka AC-3 audio decoder
module
module: new builtin module `macosx', MacOS X interface, sound and video
module
module: new builtin module `dummy', dummy functions module
module: new builtin module `null', the Null module that does nothing
module: new builtin module `rc', remote control interface module
module: new builtin module `logger', file logging interface module
module: new builtin module `mpeg_es', ISO 13818-2 MPEG Elementary Stream
input
module: new builtin module `mpeg_ps', ISO 13818-1 MPEG Program Stream input
module: new builtin module `mpeg_ts', ISO 13818-1 MPEG Transport Stream
input
module: new builtin module `mpeg_audio', MPEG I/II Audio stream demux
module: new builtin module `file', Standard filesystem file reading
module: new builtin module `udp', Raw UDP access plug-in
module: new builtin module `http', HTTP access plug-in
module: new builtin module `ipv4', IPv4 network abstraction layer
module: new builtin module `memcpy', libc memcpy module
module: new builtin module `lpcm_adec', linear PCM audio decoder
module: new builtin module `ac3_spdif', SPDIF pass-through AC3 decoder
module: new builtin module `spudec', DVD subtitles decoder module
module: new builtin module `filter_deinterlace', deinterlacing module
module: new builtin module `filter_invert', invert video module
module: new builtin module `filter_wall', image wall video module
module: new builtin module `filter_transform', image transformation module
module: new builtin module `filter_distort', miscellaneous video effects
module
module: new builtin module `filter_clone', image clone video module
module: new builtin module `filter_crop', image crop video module
module: new builtin module `fx_scope', scope effect module
module: new builtin module `dvd', DVD input module, uses libdvdcss
module: new builtin module `mpeg_ts_dvbpsi', ISO 13818-1 MPEG Transport
Stream input (libdvbpsi)
module: new builtin module `vcd', VCD input module
module: new builtin module `avi', RIFF-AVI Stream input
module: new builtin module `mad', libmad MPEG 1/2/3 audio decoder library
module: module bank initialized, found 48 modules
config: opening config file /Users/jturpin/.videolan/vlcrc
config: config file /Users/jturpin/.videolan/vlcrc doesn't already exist
info: CPU has capabilities : Altivec FPU
intf: playlist initialized
intf: added `udp:@239.255.1.1:3001' to playlist
module: locking memcpy module `memcpyaltivec'
module: locking interface module `macosx'
intf: interface initialized
intf: creating new input thread
input: playlist item `udp:@239.255.1.1:3001'
thread info: 20843264 (input) has been created (src/input/input.c:197)
input: access `udp', demux `', name `@239.255.1.1:3001'
input: opening server=:0 local=239.255.1.1:3001
ipv4 warning: cannot configure socket (SO_RCVBUF: No buffer space available)
ipv4 warning: socket buffer size is 0xa280 instead of 0x80000
module: locking network module `ipv4'
module: unlocking module `ipv4'
module: locking access module `udp'
intf: added `udp:@239.255.1.1:3001' to playlist
module: unlocking module `udp'
thread info: 20843264 has been joined ((unknown):0)
intf: creating new input thread
input: playlist item `udp:@239.255.1.1:3001'
thread info: 29457968 (input) has been created (src/input/input.c:197)
input: access `udp', demux `', name `@239.255.1.1:3001'
input: opening server=:0 local=239.255.1.1:3001
ipv4 warning: cannot configure socket (SO_RCVBUF: No buffer space available)
ipv4 warning: socket buffer size is 0xa280 instead of 0x80000
module: locking network module `ipv4'
module: unlocking module `ipv4'
module: locking access module `udp'
module: locking demux module `mpeg_ts_dvbpsi'
input warning: garbage at input (7)
input warning: garbage at input (4c)
input warning: garbage at input (40)
input warning: garbage at input (d1)
input warning: garbage at input (e3)
input warning: garbage at input (6f)
input warning: garbage at input (37)
input warning: garbage at input (9e)
input warning: garbage at input (3e)
input warning: garbage at input (3d)
input warning: garbage at input (0)
input warning: garbage at input (0)
input warning: garbage at input (7f)
input warning: garbage at input (5c)
input warning: garbage at input (6b)
input warning: garbage at input (58)
input warning: garbage at input (53)
input warning: garbage at input (a)
input warning: garbage at input (fb)
input warning: garbage at input (5e)
input warning: garbage at input (61)
input warning: garbage at input (b2)
input warning: garbage at input (a2) 

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