[vlc-devel] The --vout options has been disabled on Windows

[Steve Lhomme]

I'm really trying to understand the issue. I gathered these inputs
from this thread:

--
> LibVLC controls the vout variable to ensure that the candidate video output
> plugins match the requested render target selected by the application (X11,
> custom callbacks, etc).
>
> The X11 implementation seems actually correct. The Win32 one is so so.
--
> Yes you explained your point, it's valid, the vout should not be forced
> by any of these functions. It won't be forced by default (since the vout
> is set to "" by default). I still don't understand why we care about
> advanced usage like when user want to override the vout.
--
> $vout should be "any" if neither embedded nor callback-based.
--

When a coder wants to set the HWND (or whatever it is in the OS) s·he
might want to let libvlc decide what to use for the vout. But s·he may
also only want one specific kind of vout, for example if it was
benchmarked to work better using that module rather than another (for
example OpenGL might not have bugs that Direct3D has or vice versa).
If the coder sets an unrealistic/invalid value for "vout" then that's
his·her problem. But that doesn't mean we should block this use case
because it may not work if given incorrect values.

Callbacks are only used with vmem. So if the coder sets the "vout"
value to anything other than "vmem" after calling
libvlc_video_set_callbacks() it won't work. But again, that's a coding
error. We could be nice and detect that. Or let the coder deal with it
(it won't do what it wants and will find out quickly).

On Thu, Dec 14, 2017 at 4:31 PM, Rémi Denis-Courmont <remi at remlab.net> wrote:
> Le 14 décembre 2017 15:24:44 GMT+02:00, Steve Lhomme <robux4 at gmail.com> a écrit :
>>On Thu, Dec 14, 2017 at 12:45 PM, Rémi Denis-Courmont <remi at remlab.net>
>>wrote:
>>> Le 14 décembre 2017 09:21:52 GMT+02:00, Steve Lhomme
>><robux4 at gmail.com> a écrit :
>>>>On Wed, Dec 13, 2017 at 7:34 PM, Rémi Denis-Courmont
>><remi at remlab.net>
>>>>wrote:
>>>>> Le keskiviikkona 13. joulukuuta 2017, 18.19.01 EET Steve Lhomme a
>>>>écrit :
>>>>>> Would it fail differently than setting the vout in the VLC
>>>>preferences?
>>>>>
>>>>> First this general matter has been discussed several times already.
>>>>And then,
>>>>
>>>>It's not because a discussion on a subject already took place that
>>>>every opinion and point has been covered.
>>>>
>>>>> it´s pretty obvious that it works in VLC and not in LibVLC in this
>>>>specific
>>>>> case.
>>>>
>>>>It's not obvious to me. Rather the opposite. Hence the question.
>>>>
>>>>> --
>>>>> 雷米‧德尼-库尔蒙
>>>>> https://www.remlab.net/
>>>>>
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>>> This whole thread started because it does not work in LibVLC. Are you
>>asserting that it does not work in VLC either?
>>
>>No, I'm saying it should be possible to do it in libvlc as well
>>(probably with a new API entry). And thus not overwriting the value
>>unnecessarily.
>>
>>> --
>>> Remi Denis-Courmont
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>
> Oh come on. It has already been explained multiple times why the variable is overridden on this thread, and also why it's not quite done right on Windows.
> --
> Remi Denis-Courmont
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