[Interest] Moving to Qt Mobility

[Daniel França]

Hi Thiago,
I know that, I need the fps because it's for a subtitling application. I've
to set the subtitle in the right frame, advance frames, etc.
the interlaced stuff was only an example, I know it has nothing to do.


On Sun, Mar 11, 2012 at 3:05 PM, Thiago Macieira
<thiago.macieira at intel.com>wrote:

> On domingo, 11 de março de 2012 14.54.14, Daniel França wrote:
> > Hi, thanks for the answer.
> > low level functions I mean things like:
> > get video fps
> > change things like if a video is showed interlaced, etc
> > render subtitles on video, etc.
>
> FPS as in "frames per second" does not change depending on interlacing. You
> may be confusing frames with fields.
>
> The original TV spec from the United States (standard M) used the
> electrical
> grid's 60 Hz to drive displaying of 60 fields per second. Each field
> contains
> half of the lines, so two fields are required to form one frame, by
> interlacing
> them. That's 30 fps.
>
> In Europe and in other parts of the world where the electrical grid is 50
> Hz,
> the TVs display 50 fields per second or 25 frames per second.
>
> The 24 fps value comes from the movies, whereas 29.97, 24.975 and 23.976
> come
> from the previous three frequencies slowed down by 1 frame in 1000, to
> avoid
> intermodulation interference with the colour subcarrier.
>
> In other words, none of those values are relevant today on TV monitors and
> digital TVs (LCD, LED, Plasma).
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
>     Intel Sweden AB - Registration Number: 556189-6027
>     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
>
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