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nautilus7

Member Since 8 Sep 2012
Offline Last Active 28 Apr 2021 13:40
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Posts I've Made

In Topic: Scaler and resolution

26 April 2021 - 22:40

I insist that you cannot base your detection on actual aspect ratios seen in various films.


In Topic: Scaler and resolution

26 April 2021 - 14:49

Is enigma2 used for broadcasts or as a media player?

 

Broadcasts always have standard dimensions, while movies from local files (mkv, mp4, avi) can be cropped to whatever dimension. So, best way is to decide for them with different criteria than with broadcasts! For example, use height for broadcasts and width for local/movie files. Writing code depending on Ben Hur's aspect ratio cannot be taken seriously. The same goes for choosing random numbers (462, 1286, 1500) like it is done now...


In Topic: Scaler and resolution

26 April 2021 - 08:03

Hi Littlesat,

 

Why I don’t know as years years ago dmm engineer made that call :)

 

Height is normally (always) used for resolution detection as broadcasters often play with the width to economise on broadcast bandwidth.  In Australia for quite a long time FHD was broadcast as 1440 x 1080.  I believe this trick is still often used.

 

The reason the trick is used is because the human eye can often perceive height changes in an image but it is quite poor at noting width resolution changes.  That is, as long as the image stretches to fill the screen the eye will not readily notice the lower horizontal resolution.  It is the same reasoning as to why users note the size of TV images by height rather than width.

 

https://www.scienced...ntal-resolution

https://www.tvtechno...pixels-or-lines

 

Changing from height to width detection for any of the broadcast resolutions (at least) is a big mistake.  There are lots of explanations on this topic try Googling for more information.

 

Regards,

Ian.

In Greece as well, ERT Sports HD broadcasted at 1440x1080i, for a long time...