[mythtv-users] new PC build that's MythTV compatible

[David Watkins]

On Thu, 3 Dec 2020 at 17:08, TimP <mythtv at corky.co> wrote:

> On 2020-12-03 16:50, David Watkins wrote:
>
>
>
> On Thu, 3 Dec 2020 at 16:31, David Watkins <watkinshome at gmail.com> wrote:
>
>>
>>
>> On Thu, 3 Dec 2020 at 14:33, Stephen Worthington <
>> stephen_agent at jsw.gen.nz> wrote:
>>
>>> On Thu, 3 Dec 2020 12:27:31 +0000, you wrote:
>>>
>>> >>
>>> >>
>>> >> What are your HD recording filesizes, in GB/hour?
>>> >
>>> >In the UK I generally see 1.3GB to 2GB/hour
>>> >
>>> >SD is normally around 750MB/hour
>>> >
>>> >It can vary significantly though depending on the channel and programme.
>>> >Should be a reasonable indication of the compression.
>>>
>>> If that is H.265 it might be ok, but if it is H.264 then it is not
>>> what I would call HD.  Here in New Zealand our DVB-T HD programmes
>>> (H.264) are over 3 Gibytes per hour.  But when they first started,
>>> when there were fewer channels, they were 4.5-5.5 Gibytes per hour.
>>> And recently the only satellite service (Sky TV NZ) has converted all
>>> their transponders from DVB-S to DVB-S2 and a number of their channels
>>> are now around 4 Gibytes per hour.
>>>
>>>
>> That's interesting. What I said is typical of what I'm getting though
>> here in the UK.
>>
>> [image: image.png]
>>
>> I wonder if I should be getting 1080?
>>
>> My TV is 42" 1080. So not so big, and my old eyes are fairly happy with
>> the HD quality I'm getting.  The only thing I find poor is large black
>> areas, which can be very blocky.
>>
>> I can feel a bit of research coming on.
>>
>> D
>>
>>
>
> From the BBC Website
>
>
>> To be classed as "true" high definition, we encode in at least 1280x720
>> resolution or 720p. We use h.264 with a bitrate of 3.2Mbps (going up to
>> 5Mbps for best quality, should your connection allow) and 128kbps audio.
>> This means that streaming programmes in HD quality will put demands on your
>> network connection
>
>
>
>
> By my calculation 3.2Mbps = 1.44 GBytes/hour.  So I'm not losing
> anything.  That's what they're sending me.
>
>
> But this thread is about broadcast and not streaming. I'm getting about
> 2GBytes per hour from a Freeview HD tuner for BBC One. Your mileage will
> vary, especially on the commercial muxes where channel numbers seem to be
> more important than quality. Freeview uses stochastic compression to share
> variable compression rates between all the channels in real time. Your
> beautiful wildlife scenery panning shot might go lumpy if someone on the
> jewellery channel starts throwing glitter around.
>
> CHeers,
>
> Tim.
>
I **was** talking about broadcast, (DVB-T2 from the Crystal Palace
Transmitter, London), but I was perhaps being a bit pessimistic about the
bit rates I'm getting.  My last 7 recording from BBC 1 HD were:

1.92 GB/hr
2.03 GB/hr
1.68 GB/hr
2.04 GB/hr
2.47 GB/hr
2.19 GB/hr
1.64 GB/hr

So about 2GB/hr average.
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