[mythtv-users] Size of firewire recordings

[Ryan Lavender]

Sorry for the double e-mail.

It seems like there are an awful lot of null packets in the stream:

ryan at MythTV:~$ mythutil --pidcounter --infile
/var/video/2245_20150409185210.mpg
Unknown argument for -v/--verbose:
2015-04-09 15:41:29.808459 C  mythutil version: fixes/0.27
[v0.27.4-37-g9f61985-dirty] www.mythtv.org
2015-04-09 15:41:29.808496 C  Qt version: compile: 4.8.6, runtime: 4.8.6
2015-04-09 15:41:29.808513 N  Setting Log Level to LOG_INFO
PID 0x0000 --        5000
PID 0x0001 --        1500
PID 0x0e1c --      829276
PID 0x0e1d --       63508
PID 0x1fff --    11720446


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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