[vlc-devel] (JVLC?) Audio problem incase of two vlc instance

[Tony Anecito]

Hi Victor,

Thanks for the feedback. I am not sure how you arrived
at the conclusion of a single buffer in java but would
be very interested in the explanation.
I use separate instances of jvlc and each has its own
distinct instance of java classes so I am trying to
understand what you are saying about a single buffer
becaause if it is something I have control over I am
going to fix it.

Also, my multi-video testing I was getting messages
about dropping of frames which is typical of the
FFMPEG decoder not being able to catch up with the
audio and I was seeing the video stop updating and my
progress bar still mving ahead.

I am very interested in your analysis that lead to
your conclusion.

I do agree that vlc decoding should be able to keep up
with the audio decoding based upon the CPU utilization
being so low for one movie but from experience as you
increase CPU utilization performance loss is
non-linear.

Regards,
Tony

--- Victor Fuertes Zanon <vicfueza at teleco.upv.es>
wrote:

> Hi Tony,
> 
> I think that the problem that our friend Amaresh
> describes is not related to
> performance issues. "Any" computer can run two VLC
> instances simultaneously!
> 
> The problem is related to the in-out stream buffer
> which is shared by all the
> VLC instances that are called from the same Java
> program. Thus, you can't
> receive two different streams, or send one and
> receive another, in same Java
> program.
> 
> I'm working on this issue right at the moment and I
> will post a new message
> regarding this problem soon in this mailing list.
> 
> Can anyone help me?
> 
> Regards, Víctor
> 
> Mensaje citado por Tony Anecito
> <adanecito at yahoo.com>:
> 
> > Hi Amaresh,
> >
> > I have been able to get multiple movies playing
> with
> > sound for each by createing multiple instances. I
> used
> > jvlc. You can do the same thing by opening up
> multiple
> > instances of vlc but if you do not have a
> multi-core
> > processor you may run into performance issues
> where
> > the video decoding drops behind the audio and
> > eventually the video stops working and appears to
> lock
> > up and the CPU utilization climbs to 50%.
> >
> > Normal to expect I guess for a beta or not knowing
> > what options to use to keep vlc from locking up
> when
> > that happens.
> >
> > Regards,
> > Tony Anecito
> > Founder,
> > MyUniPortal
> > http://www.myuniportal.com
> >
> >
> >
> >
> > --- Victor Fuertes Zanon <vicfueza at teleco.upv.es>
> > wrote:
> >
> > > Hi Amaresh,
> > >
> > > first of all, I don't know how have you created
> the
> > > two VLC instances in the
> > > same application, have you used JVLC (Java
> > > Bindings)?
> > >
> > > I have found a similar problem using JVLC. I
> create
> > > two VLC instances in the
> > > same Java program, the first streams from a
> capture
> > > device and the seconds
> > > plays a stream (yes it's a videoconference
> > > application ;)). It seems the buffer
> > > (Tx/Rx) used by the two VLC instances is shared
> and
> > > they don't work well
> > > simulteneously.
> > >
> > > Try to use the first instance and, later, the
> second
> > > one. If they do work well
> > > then you can supose your problem is similar to
> mine.
> > >
> > > I don't know how JVLC is built neither how to
> fix
> > > it, but I'm working on this
> > > right at the moment. I hope Philippe Morin or
> > > Filippo Carone (the two JVLC
> > > developers I know) read this thread and help us!
> > >
> > > I let you now if I do any progress
> > >
> > > Cheers, Víctor.
> > >
> > > Mensaje citado por Amaresh Ram
> > > <Amaresh.Ram at lntinfotech.com>:
> > >
> > > >
> > > > Hi,
> > > >
> > > > I am trying to create two VLC instance in a
> single
> > > application to play two
> > > > stream simultaneously. I also want that one of
> the
> > > VLC instance should not
> > > > play audio data. I followed following steps:
> > > >
> > > > 1. created first vlc instance
> > > > 2. created second vlc instance with --no-audio
> > > option
> > > > 3. added stream 1 to first vlc
> > > > 4. added stream 2 to second vlc
> > > >
> > > > But I am not able to hear any audio. If I
> start
> > > the second vlc instance
> > > > without --no-audio option then audio for
> stream 1
> > > is audible.
> > > >
> > > > I just want to know whether individual vlc
> > > instance can be configured with
> > > > different audio/video setting?
> > > >
> > > > regards/Amaresh
> > > >
> > > >
> > > >
> > >
> >
>
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