[vlc-devel] [PATCH 01/12] vlc_input: add title angles

Thomas Guillem thomas at gllm.fr
Tue May 5 21:13:48 CEST 2020

On Tue, May 5, 2020, at 19:12, Rémi Denis-Courmont wrote:
> Le tiistaina 5. toukokuuta 2020, 19.07.44 EEST Francois Cartegnie a écrit :
> > Le 03/04/2020 à 10:21, Rémi Denis-Courmont a écrit :
> > >> We can add this helper in the player API then (like it's already done for
> > >> few complicated things that are only done from control/interfaces).
> > > 
> > > And the point of that is what exactly? At this point, we're telling
> > > everybody to treat angles as video tracks. Might as well skip the reverse
> > > abstraction and treat angles as video tracks from the ground up then.
> > 
> > Angle control can't be done using different ES.
> > The switch not only changes video, but any other associated stream. And that
> > decision must done at demux level.
> > 
> > That's exactly the same issue as when adaptive quality/alternative
> > selection patches which have been rejected and ended up with unusable
> > streams exposing countless ES to the user.
> For network feeds, you have the problem that the other pseudo-tracks are not 
> sent and received. The data for deselected tracks is not available. In fact, 
> it would be more correct to treat different network qualities as titles (though 
> that implies tying audio and video quality) than tracks.
> I don't think that's even remotely close to the situation with angles on local 
> optical media. Either angles are interleaved and they are very much the same 
> as multiple tracks, or they are not and they are more like title (because 
> seeking disc is slow). I'm guessing the earlier, otherwise I don't see how 
> audio would work.
> And in the end, the point is that we should not force LibVLC app vendors (and 
> the VLC GUI) to handle million different media-specific variants of track/title 
> selection.

As Francois said, a DVD angle can change multiple ES, I don't see how we can handle that in a vlc_player track.

> -- 
> レミ・デニ-クールモン
> http://www.remlab.net/
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