[mythtv-users] Size of firewire recordings

[Ryan Lavender]

I had to adapt an old patch in order to add the PMT/PAT packets to the
stream to get my RNG-110 cablebox to work. See
https://forum.mythtv.org/viewtopic.php?f=29&t=702.

I wonder if it is something to do with that. However when I check the stream
using the tsinfo tool, there is not an overabundance of PAT/PMT packets.
(There was before I tweaked the patch a little in order to generate fewer
packets.)

I would really rather get this working than go with a Cablecard, partly
because trading our working cablebox out for MythTV would not go over very
well in the family. And I like the challenge of problem solving.


On 4/9/15, 3:34 PM, "Gary Buhrmaster" <gary.buhrmaster at gmail.com> wrote:

> On Thu, Apr 9, 2015 at 7:07 PM, Ryan Lavender <ryanlavender at comcast.net>
> wrote:
>> Hi all,
>> 
>> I am just starting out with MythTV using firewire and a Comcast cable box.
>> My recordings seem to be really large, i.e. 2.2 GB for 7 minutes on an SD
>> channel. Is this normal for an MPEG-2 stream from a cable box? Is there any
>> way to transcode while recording to save space?
> 
> Sounds *way* off.  Depending on source, even HD is between 4-7 GB/Hr.
> Even if the firewire connection is not filtering by PID (which is,
> essentially,
> wrong) the max is 38Mb/sec, which over 7 minutes should not exceed
> (around) 40MB.  SD is clearly expected to be much lower.
> 
> However, I am going to suggest that for Comcast that you seriously
> consider an OCUR tuner rather than use firewire.  You will likely end up
> much happier (although there is an up front cost for the tuner, and the
> monthly CableCARD fee).
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