[vlc] Re: Videoconference solutions

[Rubén Lagar]

Great, setting all parameters to 20, and setting those parameters you 
told me, I got a delay of about 1 second. It is better now.

But now the video quality is horrible, I will try to adjust these 
parameters.

vlc.exe -vvv -I rc --rc-quiet --sout-ffmpeg-bframes 0 
--sout-ffmpeg-keyint 3 --sout-ts-shaping 100 --sout-ts-dts-delay 100 
--sout-udp-caching 20 --realrtsp-caching 20 --rtsp-caching 20 
--udp-caching 20 --dshow-caching 400 dshow:// vdev="" adev="" 
--sout=#transcode{vcodec=H263,width=176,height=144,vb=256,scale=1,acodec=mp3,ab=96,channels=2}:duplicate{dst=std{access=rtp,mux=ts,dst=193.147.53.32:1234}}




Sigmund Augdal Helberg escribió:
> On Mon, 2006-10-23 at 14:28 +0200, Rubén Lagar wrote:
>   
>> Hello,
>>
>> I am working for a French company, and we want to include a 
>> videoconference application in our web site (it is a collaborative 
>> site). For this, we have been testing VLC as solution. It works fine, we 
>> get a better sound and video quality than Skype.
>>
>> The way we have done this is including a VLC activeX in the web page 
>> that shows the remote WebCam. For streaming we use a java applet that 
>> runs VLC from command line, and stream the local webcam to the remote 
>> site. We have solved also NAT issues, so anyone can videoconference. As 
>> I say, it is really good quality, and video and audio are fluid (we are 
>> using H263 and MP3 codifications).
>>
>> We have just one problem, that may cause that we drop VLC as solution, 
>> and this would make me really upset. We can not remove a 2 seconds delay 
>> from the system, what makes conversation a pain. I have set to 0 almost 
>> every cache paremeter that I know, and the 2 seconds dealy is still there.
>>     
> I think 0 is an invalid value for most caching options, and vlc will
> reset them to default if they are set to 0. I'd try to set the caching
> options to something like 20. 
>
> Other options that may, or may not affect the delay:
> --sout-ts-shaping and --sout-ts-dts-delay (if you use mux=ts)
> --sout-ffmpeg-bframes and --sout-ffmpeg-keyint (if you use ffmpeg for
> encoding (which I guess you do)). Try setting bframes to 0 and keyint to
> 1 to get the lowest possible delay, then try increasing keyint and see
> if that improves quality without increasing delay (too much).
>
> Regards
>
> Sigmund
>   
>> I was wondering if any of the VLC developers could help me in locating 
>> where is this delay located, to try to remove it.
>>
>> Thank you in advance,
>> Rubén.
>>
>>     
>
>   

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