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UDP streaming screen on a mac to another mac using VLC
Posted: 30 May 2014 05:32
by jk2316
Hello everyone, I am trying to stream my screen on a mac to another mac under the same wifi using UDP. I am using VLC for both the transmitter and receiver ends.
I see nothing but endless loading sign in the play progress bar at the bottom of VLC player. There is no error messages either. I also have tried RTP, and the same thing here.
In addition, I also would like to know how to stream the screen from a mac to another using RTSP. I have tried it on Windows machines and RTSP works. However, I don't know how to use RTSP with VLC on a mac.
Please help me on this. Thank you in advance!
Re: UDP streaming screen on a mac to another mac using VLC
Posted: 04 Jun 2014 10:47
by crackstone
Via terminal have you tried starting the stream with:
Code: Select all
vlc -vvv -I dummy screen:// --sout='#transcode{vcodec=h264, samplerate=44100, vb=96, fps=30, acodec=mp3, ab=64, height=240, width=320, scale=1}:standard{access=udp, mux=ts, dst=239.0.0.1, port=1234}'
and then playig it on a another mac with:
Also read up on commands in this
post on stackoverflow.
Re: UDP streaming screen on a mac to another mac using VLC
Posted: 07 Jun 2014 21:28
by jk2316
Thank you so much crackstone. It works!
However, the delay is more than 10s. How to pass the arguments to the VLC command line tool for both the transmitter and receiver ends, so that the latency is lower? Thanks again.
Re: UDP streaming screen on a mac to another mac using VLC
Posted: 07 Jun 2014 22:02
by crackstone
You don't need to compile a VLC version in order to use it on a command line.
You can start VLC via Terminal via the following command
Code: Select all
/Applications/VLC.app/Contents/MacOS/VLC -vvv
The -vvv parameters are for verbose output. Now just use the commands from my earlier post and replace vlc in the beginning with the path to your actual VLC.app and you are good to go.
Re: UDP streaming screen on a mac to another mac using VLC
Posted: 07 Jun 2014 23:59
by jk2316
Hey crackstone, thanks again for your quick response. I managed to get to that place in the same way as you mentioned, and changed the question after.
Now the problem is the start time (at the client end) and latency.
Pls advise me on:
(1) how to setup the arguments, so that the latency can be greatly reduced (less than 1s ideally).
(2) the connection is created (client VLC needs 30 seconds to show the screen stream, i.e., the start time for client is 30 seconds) way too long. How to make it faster?
(3) what rtsp server does VLC use by default, LIVE555?
(4) In addition, how to get rid of the transcoding and encode the sequence of the captured screen images using x264 encoder? What is the original format of the screen image (RGB)? I want x264 encoder to code RGB or YUV image sequence into H.264 format directly.
Thanks in advance.