[mythtv] Firewire DV Capture

[jimbo-mythtv at edwardsclan.net]

I was looking at the latest HDTV Firewire patch, great work!  However, as
some other people have noticed, some channels are encrypted (actually,
almost all here are, except broadcast channels).  I am not an expert on
Video compression, so I had some thoughts/ideas that I was considering
implementing.  Since libiec61883 also supports DV stream capture, using an
almost identical API, I was thinking of creating another patch that uses DV
stream instead of MPEG2 TS.  This would allow those encrypted channels to
work using a DV video converter (I have an abundance of those).  Then using
those two inputs, you would create a channel list for each, the
non-encrypted ones would go over the MPEG2-TS, while the encrypted ones
would come in over DV.  My question is, I noticed the patch was using
MPEG2-TS specific functions, to align keyframes and such, since DV is a
different structure, how might that code have to change?  Would the
DTVRecorder class be able to handle DV streams with minimal modification?
>From what I can tell, it seems to be very specific to MPEG2.

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