On Friday, July 25, 2003, at 02:00 pm, Andrew de Quincey wrote:
On Friday 25 July 2003 06:36, Robert Schlabbach wrote:
The BBC method is called AFD and described here:
http://www.dtg.org.uk/publications/books/afd.pdf
I don't know if there is any AFD implementation for Linux yet...
This is actually part of the DVB-T standards now. Look at ETSI TR 101 154
v1.41 Annex B.
AFD is in addition to the standard MPEG2 aspect ratio stuff.. basically, it
lets the broadcaster describe which area within the frame is relevant, so you
can a 14:9 picture within a "physical" 16:9 one.
Its quite easy to implement; I'd recommend using libmpsys to parse the MPEG
transport stream.
Hmm... I'd quite like to see this implemented, as the BBC and five (in the UK) broadcast all their terrestrial 4:3 output in a 16:9 frame (complete with black pillars) and include an AFD to notify STBs that it's really 4:3.
Annoyingly, DVB/VDR/Dxr3 do not support AFDs, so any such 4:3 output looks very silly on a 4:3 TV (you get a black border around all four sides).
Is it possible for the DVB cards to support AFDs? I don't suppose a Dxr3 can...?
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