Re: Webcam resolution in VLC (and elsewhere)
On Thursday 31 December 2020 10:59:36 Celejar wrote:
> On Wed, 30 Dec 2020 10:53:37 -0800 (PST)
>
> didier gaumet <didier.gaumet@gmail.com> wrote:
> > Le mercredi 30 décembre 2020 à 16:40:06 UTC+1, Celejar a écrit :
> > [...]
> >
> > > 1) Why does VLC default to the lower resolution? Incidentally, I
> > > see that Cheese also opens the camera by default at a lower
> > > resolution - but a different one: 960x540. Why? Is this to save
> > > space when recording?
> >
> > I don't know: one possibility is that either Linux or VLC/Cheese
> > incorrectly detects the webcam resolution? Another possibility could
> > be
>
> The manufacturer claims that it's 720p HD:
>
> https://www.lenovo.com/us/en/laptops/thinkpad/w-series/w550s/
>
> > a marketing trick: an higher resolution is claimed through
> > interpolation while actual optical resolution is lower.
>
> I don't know how to evaluate this. But still, if the camera is
> reporting 720p, shouldn't the applications default to that? Do they
> somehow figure out that the 720p mode is cheating and therefore ignore
> it by default?
>
> > > 2) VLC's GUI doesn't seem to offer any way to set the resolution.
> > > I see all kind of references on the internet to knobs to turn to
> > > set resolution, but none of them seem available in my VLC when
> > > using a v4l2 camera. Why?
> >
> > I use VLC from Buster. the following is the rough english
> > translation of my VLC that is in french.
> >
> > - To set up the resolution of the webcam for a session and begin the
> > session: Media>Open a capture device, then set up the capture mode
> > to video camera, click on advanced options button and fill the width
> > and height fields. - To set up the default resolution of the webcam:
> > Tools>Preferences, then click on display parameters: all, then
> > input/codecs>access modules>v4l, fill the width and height fields
>
> You're right, I was mistaken. The Advanced option do contain height
> and width fields (parelleling the height and width CLI parameters I
> mentioned).
>
> But I still think it's ridiculous that a) VLC doesn't provide a list
> of supported resolutions to choose from, instead making the user
> figure these out using other tools, and then enter the values manually
> and b) hides these fields under the Advanced options, which, as I
> noted, the documentation describes as "useful in some rare cases"
>
> Celejar
Cheers, Gene Heskett
--
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