Multicast audio only file?

[SoftwareDave]

VLC-0.7.2, Windoze 2k

I'm successfully multicasting video files, but I can't figure out how to stream audio only files, eg .wav files.
I tried from the command line:

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vlc -vvv audio.wav --sout udp:239.20.30.40:1234

and I get a lot of output in the logger window, of which the most likely bit is this:

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[00000226] main packetizer debug: looking for packetizer module [00000226] main packetizer debug: probing 29 candidates [00000146] main module debug: using packetizer module "packetizer_copy" [00000218] main input debug: stream out mode -> no decoder thread [00000218] main input debug: starting in synch mode [00000219] main stream output debug: adding a new input [00000223] main private debug: adding a new input [00000223] mux_ts_dvbpsi private debug: adding input codec=u8 pid=68 [00000223] main private error: cannot add this stream [00000226] main packetizer error: cannot create packetizer output

I've tried the streaming wizard, and I get this (logs edited for brevity)
1. Without selecting audio codec transcoding:

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[00000233] logger interface: Using the logger interface module... [00000234] main input: playlist item `C:\audio.wav' [00000240] main private error: cannot add this stream [00000243] main packetizer error: cannot create packetizer output

2. With audio codec mpga, MP3, or a52 selected:

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[00000256] ffmpeg encoder error: cannot open encoder [00000256] ffmpeg encoder error: cannot open encoder [00000246] stream_out_transcode private error: cannot open encoder [00000246] stream_out_transcode private error: cannot create audio chain [00000255] main packetizer error: cannot create packetizer output

3. With audio codec MP4a selected:

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libfaac doesn't support this output format

4. With codec vorb selected:

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vorbis encoder error: CBR mode initialisation failed

5. With flac or spx:

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main private error: cannot add this stream

I've looked through previous posts, I saw this reply from markfm:
viewtopic.php?t=2534
and modified the command line he used, but to no avail.

Am I missing something? I note that in markfms reply he states that ffmpeg is needed. I don't have any ffmpeg plugin (or at least none called *ffmpeg*), but it appears from the source that ffmpeg is statically linked. That's just a guess.

By the way, as you'd expect the client end is showing no activity in the logger window while trying these, while it does show activity when videos are streamed.

Thanks in advance for any help.

[Sigmund]

I guess you should convert your wav file to 16 bit. In fact I find it abit strange that vlc don't do it for you. Perhaps you could try transcode{"S16N"}:transcode{"mpga"} or something like that

[SoftwareDave]

Couldn't find any reference to S16N anywhere on the videolan.org site, but I tried it:

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vlc --extraintf=logger -vvv audio.wav :sout=#transcode{"S16N"}:transcode{acodec=mpga,ab=192,channels=2}:duplicate{dst=std{access=udp,mux=ts,url=239.20.30.40:1234}}

and got this in the logger window:

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[00000220] main private warning: option S16N is unknown