[mythtv-users] small portable DVR

James Abernathy jfabernathy at gmail.com
Sun Jan 13 17:12:00 UTC 2019


Jim Abernathy
jfabernathy at gmail.com



> On Jan 13, 2019, at 12:02 PM, Greg Oliver <oliver.greg at gmail.com> wrote:
> 
> On Sun, Jan 13, 2019 at 9:51 AM James Abernathy <jfabernathy at gmail.com <mailto:jfabernathy at gmail.com>> wrote:
> On Jan 13, 2019, at 11:42 AM, George Poulson <george.poulson at gmail.com <mailto:george.poulson at gmail.com>> wrote:
>> On Sun, 13 Jan 2019 at 16:18, Jay Harbeston (ISeePeople) <jharbestonus at gmail.com <mailto:jharbestonus at gmail.com>> wrote:
>>  
>> Experimentation would be a good validation of the above using the small 32gb sd card with and without the 2TB usb drive.
>> 
>> If you're adding self-powered USB disks to an RPi you need to pay a lot of attention to your power supply :-)
>> 
> 
> My external USB Hard Drive has it’s own power supply so that is not a problem.
> 
> Until I build mythtv backend on the RP3 I won’t know it’s capability.  I do know that with tvheadend I can record 3 HDTV programs at once without issues.  Just don’t know about mythtv-backend.
> 
> Jim A
> 
> I think everything would be fine since ATSC is 26Mbits max (15 -> 21 usual) for up to four recordings.  If compressed with 264, way smaller...  I have never tried commflagging on arm though, so unsure the CPU optimizations that are granted on x86 with all of it's extras.  I would definitely start with and add recordings one by one and watch the CPU, but it should have no issue just raw recording I would imagine.
> ___________________

I was going to turn off commflagging completely as I really done use it on my big backend where it’s on by default. For the RP3 it’s about data movement and I’d expect mythtv backend to be about the same as tvheadend on bus bandwidth

Jim A

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