[mythtv-users] Can Mythtv record uncompressed video from PVR-150? (my Comcast solution)

Scott pickle136 at sbcglobal.net
Fri Apr 9 13:21:14 UTC 2010


On 4/9/2010 1:54 AM, Nick Rout wrote:
> On Fri, Apr 9, 2010 at 5:49 PM, Bill Bogstad<bogstad at pobox.com>  wrote:
>    
>> As Comcast moves towards turning off clear-QAM in my area, I've been
>> working on resurrecting my PVR-150s for use with the 'free' DTAs.  One
>> of the nice things about the SD clear-QAM that Comcast sent was that
>> it took about half the disk space for the same length recording that
>> the PVR-150 did.  (And to my eye with better overall quality.)  I
>> could transcode to a better format, but I wondered if there was a way
>> to get the uncompressed stream from the card in order to avoid the
>> quality issued which can be introduced by transcoding.   From what I
>> have found on the web, it's possible to get the raw audio/video stream
>> before encoding is done. on these cards.  The Mythtv page for the
>> PVR-500 even mentions it:
>>
>> http://www.mythtv.org/wiki/Hauppauge_PVR-500
>>
>> /dev/video0 – The encoding capture device (Read-only)
>> /dev/video24 – The raw audio capture device (Read-only)
>> /dev/video32 – The raw video capture device (Read-only)
>> /dev/radio – The radio tuner device
>> /dev/vbi0 – The "vertical blank interval" (Teletext) capture device
>>
>> So my question is:  Has anyone ever configured MythTV to treat the
>> PVR-150 (or similar cards) as a dumb capture card rather as an MPEG
>> capture stream?
>> If so, what did it take to set it up?
>>      
> IMHO this is madness, even if it were possible. You will be recording
> a file that is many times larger than the PVR150 file would be. You
> will NOT simply be recording the unencrypted QAM stream, you will be
> recording that stream decoded to analogue and then encoded raw to the
> hard drive.
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>    
I dont think its possible the mpeg2 encoding is occurring on hardware on 
the card


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