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<blockquote data-quote="lkuech" data-source="post: 326815" data-attributes="member: 46526">Hi ketjap.The idea of the boxes is that they are always centered. That means if you set the box width to 30%, there are 35% on the left and 35% on the right of the box that's not analysed.&nbsp; The most broadcasters have their logos in corners of the upper black bar so it is necessary to analyse only the middle part of a black bar.The startpos is a kind of an offset. Some broadcasters send &quot;garbage&quot; in the first lines of their signal (i.e. teletext). Because of this it is important to define a box to analyse that does not contain this &quot;crap&quot; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" />The centerbox has the job to make the detection more reliable. Just analyse the top and/or bottom bar is a bit critical, because even programs without letterboxes have from time to time &quot;black content&quot; in the analysed boxes (i.e. during an intro of an movie where the whole screen is black with only some words in the middle). The letterbox detection is only allowed to change from activate to deactive (or the other way around) if the centerbox is not black and the upper or bottom box is black...I hope that explains it a bitByeLars</blockquote>

[QUOTE="lkuech, post: 326815, member: 46526"] Hi ketjap. The idea of the boxes is that they are always centered. That means if you set the box width to 30%, there are 35% on the left and 35% on the right of the box that's not analysed. The most broadcasters have their logos in corners of the upper black bar so it is necessary to analyse only the middle part of a black bar. The startpos is a kind of an offset. Some broadcasters send "garbage" in the first lines of their signal (i.e. teletext). Because of this it is important to define a box to analyse that does not contain this "crap" ;) The centerbox has the job to make the detection more reliable. Just analyse the top and/or bottom bar is a bit critical, because even programs without letterboxes have from time to time "black content" in the analysed boxes (i.e. during an intro of an movie where the whole screen is black with only some words in the middle). The letterbox detection is only allowed to change from activate to deactive (or the other way around) if the centerbox is not black and the upper or bottom box is black... I hope that explains it a bit Bye Lars [/QUOTE]

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