[vlc] Re: http at high rates

[Viktor Kompaneyets]

Marcelo Manzato wrote:

> Hi Viktor,
> 
> One computer (windows, P4 Intel 2GHz, 768 MB RAM) is
> capturing the video content (no audio), encoding under
> mp4v/ffmpeg and transmitting to darwin streaming
> server. The command I use for that is the following:
> 
> vlc.exe -vvv dshow:// :dshow-size="640x480" --noaudio
> :sout=#transcode{vcodec=mp4v,vb=2000,fps=30,venc=ffmpeg}:rtp{dst=192.168.0.1,port-video=20000,ttl=8,sdp=file://C
\main.sdp}

Why you do not use single vlc instance? Is Darvin StreamingServer mandatory?

> 
> Then, another computer (linux, P4 Intel 3Ghz, 1GHz
> RAM) requests that content from Darwin, and makes
> available the html access, from the following command
> line:
> 
> vlc -vvv rtsp://192.168.0.1/main.sdp --noaudio
> :sout="#duplicate{dst=std{access=http,mux=ts,url=:8080}}"
> 
> Under these conditions (2 Mbps of bitrate) everything
> seems to be fine, however, I want higher bitrates
> (about 15 Mbps), what causes the problems previously
> rited if I increase the vb parameter from the encoder.

In this cace you should set  "http-caching" option lagre enough, to have
full I-frame-I-frame sequence to be cached. With 4.5-6Mbit/s seq (DVB
typical MPEG2 program stream) I set them to 500-800, higher bitrate-larger
cache. It eats memory, but adds stability in video.   

> 
> 
> Thanks for your atention.

-- 
Viktor Kompaneyets
Wnet project manager

-- 
This is the vlc mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://www.videolan.org/support/lists.html