[mythtv] Aspect ratio changes
Torbjörn Jansson
torbjorn.jansson at mbox200.swipnet.se
Mon Jan 5 14:59:41 EST 2004
Has anyone thougth about adding wss support?
If I remember right this is some kind of embedded teletext like signal that
some tv stations send so wide screen tvs can adjust the aspect ratio
automaticaly.
> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org
> [mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of steve at nexusuk.org
> Sent: Monday, January 05, 2004 7:32 PM
> To: mythtv-dev at mythtv.org
> Subject: [mythtv] Aspect ratio changes
>
>
> My Sky box (and most other decoders) use pin 8 of the SCART
> connector to
> tell the TV what aspect ratio it should be running in (5v for
> 16:9 and 12v
> for 4:3). I would like to include information of aspect
> ratio changes
> provided by this signal in the stored video, so I would like
> comments on
> the following idea:
>
> Pin 8 of the input SCART connector would be connected to a
> serial port on
> the backend via a suitable circuit.
>
> Pin 8 of the output SCART connector would be connected to a
> serial port on
> the frontend via a suitable circuit (if the frontend and the
> backend are
> the same machine then this may be the same serial port)
>
> A separate daemon would watch the serial port for changes in
> the input
> signal and relay them to the backend via a unix domain
> socket. Similarly
> the frontend would be able to send aspect ratio changes to
> the daemon via
> the unix domain socket.
>
> Now, the bit I'm not sure about is how to incorporate the
> data into the
> video stream - I'm thinking of doing the same as the
> NuppelVideoRecorder::WriteText() function but use a different
> frametype.
> Would this seem to be the best way to handle the data?
>
> There would be a user configurable option to tell the
> frontend whether to
> send signals to the daemon when it wants to change the aspect
> ratio or to
> use the existing aspect ratio changing code (which scales the video).
>
> --
>
> - Steve
> http://www.nexusuk.org/
>
> Servatis a periculum, servatis a maleficum - Whisper, Evanescence
>
>
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