[vlc-devel] Libvlc hangs when setting media descriptor in media reached end callback

[jboileau]

Hi Pierre,

In the immortal words of Dr. Frankenstien: "It vorks Igor! It VORKS!!!!"

I did some tests this morning with the latest nightly build dated
2008-01-25 and this issue has been resolved. I don`t know what magic has
been done but it works now, thanks. The reason I had not been using the
latest builds was because of the other problem: the media reached end
callback being called twice with a state of libvlc_Ended. The latest nightly
build still has this problem BUT the second time the state is libvlc_Playing
so now I can simply ignore that second one.
One small problem with that latest build I have to investigate is that the
option :no-video-title-show does not work anymore.

Thanks for your help,

Jacques
On Feb 1, 2008 1:26 PM, Pierre d'Herbemont <pdherbemont at free.fr> wrote:

> Hi Jacques,
> Could you backtrace the running stuck process to see where in vlc it does
> hang?
>
> Pierre.
>
>   On Feb 1, 2008, at 2:17 PM, jboileau wrote:
>
>   Hi Pierre,
>
> Have you had a chance to look at this (see description below)? I can
> download and try the latest build, but wanted to know if anything changed
> before trying it out. Of course I never rule out that there isn't any
> problem and that I am just doing things wrong. In that eventuality, let me
> know if you have any idea on how differently I should do things, I would
> greatly appreciate. It is a bit problematic for me to not be able to start a
> new play from inside the media reached end callback.
>
> Thanks for your help,
>
> Jacques Boileau
>
> On Jan 24, 2008 4:14 PM, jboileau <jboileau at gmail.com> wrote:
>
> > Hi Pierre,
> >
> > Unfortunatly my plan didn't work as well as I had hoped. Here is in a
> > nutshell what I do in the callback now:
> >
> > I create a new media descriptor (libvlc_media_descriptor_new)
> > I add options (libvlc_media_descriptor_add_option)
> > I set the descriptor (libvlc_media_instance_set_media_descriptor)
> > I start the play (libvlc_media_instance_play)
> >
> > The rest I do once at start up:
> >
> >  I create a media instance (
> > libvlc_media_instance_new_from_media_descriptor)
> >  I get the event manager (libvlc_media_instance_event_manager)
> >  I attach to it (libvlc_event_attach)
> >
> > Now when I am in the event it hangs in the call to
> > libvlc_media_instance_set_media_descriptor. This happens independently if I
> > call from the event or if I post myself a message and do it there!
> > Strange! In an attempt to figure things out I have added a call to libvlc_media_instance_stop
> > prior to calling libvlc_media_instance_set_media_descriptor. This makes
> > things work IF not called directly from the event, otherwise it hangs in
> > libvlc_media_instance_stop.
> > Hopefully I have included enough details to help you out.
> >
> > Jacques Boileau
> >
> >
> > On Jan 24, 2008 1:32 PM, jboileau <jboileau at gmail.com> wrote:
> >
> > > Hi Pierre,
> > >
> > > I just took a closer look at the API and I will try creating a media
> > > instance that will be used for the life of my application and use
> > > libvlc_media_instance_set_media_descriptor for each new file I play. That
> > > way I won't release the media instance from inside my event. This seems like
> > > a much better idea. I'll let you know how it turns out.
> > >
> > > Jacques
> > >
> > >   On Jan 24, 2008 9:04 AM, jboileau <jboileau at gmail.com> wrote:
> > >
> > > > Hi Pierre,
> > > >
> > > > Well yes the problem is with the release of the media instance and
> > > > it probably make sense that it hangs there. But I don't know how to do
> > > > things diffrently. If I need to create a new media descriptor and then get a
> > > > new media instance from it, if I don't release the previous one won't I end
> > > > up with memory leaks? Here is what I do in my event callback. Any
> > > > suggestions on what to do differently for things to work?
> > > >
> > > > I detach from the event manager (libvlc_event_detach)
> > > > I release the media instance (libvlc_media_instance_release)
> > > > --> and it hangs right here as expected <---
> > > > I create a new media descriptor (libvlc_media_descriptor_new)
> > > > I add options (libvlc_media_descriptor_add_option)
> > > > I create a media instance (
> > > > libvlc_media_instance_new_from_media_descriptor)
> > > > I release the media descriptor (libvlc_media_descriptor_release)
> > > > I get the new event manager (libvlc_media_instance_event_manager)
> > > > I attach to it (libvlc_event_attach)
> > > > I start the play (libvlc_media_instance_play)
> > > >
> > > > I hope this helps you figure things out. Let me know if you need
> > > > more details.
> > > >
> > > > As always: thanks for your help it is greatly appreciated!
> > > >
> > > > Jacques
> > > >
> > > >   On Jan 23, 2008 5:58 PM, Pierre d'Herbemont <pdherbemont at free.fr>
> > > > wrote:
> > > >
> > > > >
> > > > >  On Jan 23, 2008, at 10:48 PM, jboileau wrote:
> > > > >
> > > > > My reason to do that is to be able to start a new play from inside
> > > > > the libvlc_MediaInstanceReachedEnd event. I may not be doing
> > > > > things correctly but presently it simply hangs in my callback. Probably
> > > > > because I am trying to release something that is probably what is calling me
> > > > > back! :-) The media descriptor. I have circumvented the problem by posting
> > > > > myself a message (I am working under Windowzzzz) and this lets me do what I
> > > > > want since in the handler for this message I am out of the
> > > > > libvlc_MediaInstanceReachedEnd event callback. But I would rather not have
> > > > > to resort to this double callback scheme to get things working.
> > > > >
> > > > >
> > > > > This is a bit weird cause you shouldn't get issue when releasing
> > > > > the media descriptor in the media_instance callback, unless you are
> > > > > releasing the media instance that currently plays the media descriptor.
> > > > >
> > > > > Tell me if you encounters more trouble, I'll have a look over the
> > > > > weekend.
> > > > >
> > > > > Pierre.
> > > > >
> > > > > _______________________________________________
> > > > > vlc-devel mailing list
> > > > > To unsubscribe or modify your subscription options:
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> > > > >
> > > > >
> > >
> > >
>
>
> --
> Jacques Boileau _______________________________________________
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>
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-- 
Jacques Boileau
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