[vlc] Re: Playback of raw PCM audio / Real-time muxing

[Sigmund Augdal]

On Thu, Feb 17, 2005 at 07:36:31AM -0600, Mitchell Mebane wrote:
> 
> 
> Sigmund Augdal wrote:
> 
> >On Wed, Feb 16, 2005 at 09:51:26PM -0600, Mitchell Mebane wrote:
> > 
> >
> >>Hi there,
> >>
> >>I have a project where I need to be able to take a network audio stream 
> >>and save it to disk while playing it. After looking at several 
> >>solutions, I believe VLC is currently the best suited to my needs.
> >>   
> >>
> >Which protocol are used here? If it is rtp then you need a .sdp file for 
> >vlc
> >to play this source. if the mjpeg also is in rtp then you can write one sdp
> >for both and vlc should be able to mux them.
> >
> >Sigmund
> >
> > 
> >
> 
> It's http. I'm capturing from a server built in to a security camera, so 
> there's probably no way I can change that.
> 
> They way it works is the camera provides two CGI scripts. GetData.cgi 
> gives me the MJPEG stream, and GetAudioData.cgi?Format=Pcm gives the 
> audio stream. I can also get ADPCM audio, which I haven't tried with VLC 
> yet.
If it's in http, with no header then vlc currently can't know what the data
is, so you'll have to hack the sources in order to play it. I actually think
it would be very hard, if at all possible, to automatically detect and play
such a stream. If you could help a bit more, what is the mime-type of the
stream?

Sigmund

> 
> --Mitchell
> 
> >>The file I am trying to open is streaming data as raw PCM, signed 
> >>16-bit, little-endian, mono, 8000 Hz. When I try to stream it directly, 
> >>it doesn't work. When I use the "Dump raw input" option, I get a data 
> >>stream I can import into Audacity, but that doesn't fulfill my need to 
> >>playback in real time while recording.
> >>
> >>I also would like the ability to open this stream as well as an MJPEG 
> >>stream and play them in sync while muxing the data and saving it to 
> >>disk. I have been unable to find an option in VLC to open separate audio 
> >>and video streams. Is this possible?
> >>
> >>If VLC can't do these things, are there any other products, free or 
> >>commercial, that can?
> >>
> >>I'm using VLC 0.8.1 under Windows XP.
> >>
> >>I've been looking at the VLC how-to, and in Chapter 4 
> >><http://www.videolan.org/doc/play-howto/en/ch04.html#id2529330> of the 
> >>manual, it mentions "VLC should be able to recognize the file type. If 
> >>it does not, you can force demultiplexer and decoder (see below)." 
> >>However, the document does not actually cover this topic. I see that vlc 
> >>has a --codec option, but I don't know what options to pass to this.
> >>
> >>Thanks,
> >>Mitchell Mebane
> >>
> >>-- 
> >>The roots of education are bitter, but the fruit is sweet.
> >>--Aristotle
> >>
> >>   
> >>
> >
> > 
> >
> 
> 
> -- 
> The roots of education are bitter, but the fruit is sweet.
> --Aristotle
> 

-- 
Sigmund Augdal
Edgar B. Schieldropsv 29-14
N-7033 Trondheim
Norway
tlf: 91809129

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