[linux-dvb] Another idea to enhance timed recordings.

[Carsten Koch <Carsten.Koch@icem.de>]

Here is an idea that is quite bullet-proof, but
a bit limited in scope:

For recordings of programs (like 3sat's "nano"), which
have a well-defined intro, we could do the following:

Take two frames from a previous recording, extract a 
few raster lines from the middle of these frames, build
a checksum from theses lines and store it with the timer.

At a certain time before the scheduled start of this program,
VDR would switch to that channel and compare the checksums
of the same raster lines of every frame with the stored
checksum. As soon as the first frame is found this way, 
VDR checks whether the second frame follows in the correct
distances. If yes, it starts the recording. 

As a safety precaution, it could start the recording at
the scheduled time in any event.


Carsten.


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