The VideoLAN Forums

HI VLC

I just need pointing in the right direction to get started. Im sure what I want is already discussed but after looking at the forum Im a bit lost in technical network jargon. Although Im not daunted.

I would like to use VLC to play synchronized HD files on multiple projectors. All the files are the same length but contain different content.
This will need multiple synchronized computers sending each stream to each projector. I hope this is simply explained.

Can you please help me get off on the right foot to understand how to do this, If it possible

thanks a lot
semiconductor

Is this not even possible then?

Am I not being clear?

semiconductor

Hi,

Quite simply explained, but synchronize several computers as needed looks not simple :-)
Maybe its need a kind of distributed algorithm to synchronize the "start" event on all computers and to adjust the playing time from time to time.

To do this, maybe I whould have written a shell around libvlc (or around the ActiveX on Windows) to comunicate between each instance (though the network) and synchronize every computers and playbacks.

Ok I see.

I had imagined that an MPEG 2 multistream could be multicast and then converted to a single stream by each of the netwrked computers.

I obviously have no idea about it though

semiconductor

You can playback separate MPEG-2 clips (HighDef or StandardDef) from different decoders frame-accurately across multiple boards with aPlay. http://aplay.tv

Bargain , there only €2000-€4000 per board . So a 3 synched HD set up could cost up to €12000.

Ill just pop out and buy one

VLC is free, if i wanted an unlimited budget option I wouldnt be here would I

Well, VLC can stream the same content easily.
One option is to stream the same stream with all the videos inside it and each playing VLC instance plays a different video track.

Ok thanks JB thats the sort of thing i was hoping for but how do i go about making that stream?

Any pointers would be greatly appreciated.ie software to make the stream or what that type of stream is?


thanks again
semiconductor

Is it live?

No I intend to use for installations, but I would love to know how you could do it live also.

Really I just want to know how you would pack HD streams into one file or whatever it is you do to make it work.

Well, I would mux many video tracks/programs in the same TS file.

sorry but can you let me know what software can do that?
I understand the principal in DVD-Video but Ive never heard of a prgram that can do HD that way.

Im still waiting for an answer.
If its so easy how do I mux 3 HD MPEG2 files into one stream?
What reasonably priced of freeware software can do this?

thanks

Oh its forbidden to talk about it !!!

Can you at least say if or if NOT FFmpeg can do this?
I would give it
3 HD MPEG2 25mbps files with audio
and it mux's them into one stream
that can be played via 3 vlc instances choosing one stream each
(onto 3 monitors attached to one or more pc.)

There's a variety of ways to mux them. Both vlc and ffmpeg should be able to do it. It's been a while since I've done this so I won't conjecture on command-line options. I believe you can also build the TS and/or time-align multiple playback using VLS or VLM.

Alternatively, if you plan on doing a lot of these, you may want to use a physical encoder + mux chain and record the TS out of the mux, on creation (if a production company is building these for you, you might want to see if they can simply provide the TS file).