[vlc-devel] how to make UDP packets as the VLC input stream
warren at etr-usa.com
Fri Nov 16 00:24:45 CET 2012
On 11/15/2012 00:17, leon wrote:
> I am wondering how to make UDP packets as the VLC input stream?
VLC can do this, via Media > Stream. Select the video source, then for
the destination address select a multicast address. That is, most
anything in the 220.127.116.11 - 18.104.22.168 range. There are rules for
various addresses in this range, so Google "multicast" for some hints.
You can do unicast instead, but really, multicast is best when you're
talking about UDP streaming. Give unicast a miss unless you know for a
fact you have to do it that way. (e.g. WAN streaming where the WAN is
controlled by hostile firewall admins.)
Then within another VLC instance, you can say Media > Open Network
Stream and put in something like udp://@22.214.171.124:1234 and receive
The reason the UDP option is probably marked as "legacy" here is that
many people strongly prefer using RTP for multicast instead, because it
is better suited to A/V over the network. They're right for the most
part, though there are exceptions where raw UDP still makes sense.
Unless you know for a fact you have one of those exceptional cases, you
should probably be using RTP. The procedure is the same. VLC handles
the differences entirely under the covers.
There are other ways to produce the stream. VLC's command line
interface has enough power to do it:
So does VLC's VLM mode:
You can do it with third-party sources, too, like Live555:
> Or how can I use VLC transcode lib/api inside python after I got video
> stream via socket.recv?
If you have an outside network video source and are just trying to
redirect it to a local VLC instance via a third machine, you might want
to look into the Live555 proxy server:
It's not Python, but then, for video work, you shouldn't be doing
anything more complex than offline scripting tasks with Python and video.
I'm no scripting language hater. It's just that video has a way of
using up the full capacity of available machines. Now that average
desktops can handle 1080p without special help (e.g. expensive GPUs),
we're starting to hear about 4K video on the desktop. Next it will be
120 Hz 3D 4K on the desktop. Then I dunno...real-time holography? :)
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