Hi Kit,
 
there is an easy way out:
 
Use a Philips Video Decoder (SAA7113 or similar), it will generate a locked 
 27MHz output reference pixel clock from the video stream coming out of the 
 STB.
 
Unfortunately most $49 STB's don't do proper PCR synchronization via PLL,  
they just do dropped frames, or repeated frames...
 
bye,
Said
 
 
In a message dated 11/23/2009 15:32:47 Pacific Standard Time,  
[email protected] writes:


Attempting to recover any part of a RAW MPEG data stream from a  "$49
digital STB" may be doomed to failure. Most STB of this ilk use a  single
jungle-chip with RF in and various flavours of video out.  The  data
streams you need to access for any clock recovery strategy  is
unfortunately buried in  silicon....


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