anothersname at googlemail
Apr 11, 2010, 4:56 AM
Post #35 of 49
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On 11 April 2010 11:25, Nicolas Will <nico [at] youplala> wrote:
> On Sun, 2010-04-11 at 11:13 +0100, Richard Morton wrote:
>>
>> >> All recordings vary.
>> >> For example:
>> >> A 1 hour SD recording made on my PVR-500 is about 2.2G (Analog
>> Capture).
>> >> This would be on par with your 2 hour recording.
>> >> A 1 hour SD recording made by my HD-5000 is about 900 MB (Digital
>> >> Capture).
>> >> A 1 hour HD recording made on my HD-5000 varies from about 3G (SD
>> show on
>> >> a
>> >> HD channel, black bars on the sides) to about 5G (720p HD
>> recording) to
>> >> about 8G (1080p HD recording). The 720p HD capture would be on par
>> with
>> >> the
>> >> other party's 10G recording.
>> >>
>> > Bitrates. Although I only record SD over here in the UK, I normally
>> get
>> > 2.0-2.2 Gb/hour from recording off Freeview (YMMV). However,
>> sometimes when
>> > a feature film is shown the file sizes can vary enormously from this
>> nominal
>> > rate. It all depends what bitrate the film was originally encoded
>> with, I
>> > suspect. Some are much smaller, but don't appear to be of less
>> quality. A
>> > few are /much/ bigger (like double or more), but don't appear to be
>> of much
>> > greater quality.
>> >
>>
>> I use a NovaT500 and I see wide variations on Freeview UK
>> BBC1,2&3 - 2.7 to 3GB/Hour
>> ITV1,2, Sky3, Channel4 - 1.3 to 1.5GB/Hour
>> Dave, Virgin1, More4, E4, Five, FiveUSA, Fiver - 1.0 to 1.2 GB/Hour
>
> This is not related to your "capture" card. This card doesn't touch the
> signal at all.
>
> All the channels just dynamically share the total available bandwidth
> available inside a multiplex. When one channel increases its bitrate for
> better quality during a feature film, for example, at least on other
> channel in the multiplex will suffer and see its bitrate go down, and
> its picture quality degrade.
>
> Nico
>
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>
In the past for testing/interest I've recorded movies from both the
BBC and ITV using both the DVB-T and DVB-S feeds simultaneously and
found the same movie will have a massively different bitrate off the
DVB-S feed (sometimes as much as twice the DVB-T bitrate). BBC HD off
Freesat currently outputs at about 6.5GB per hour, as no-one has
released a DVB-T2 card yet AFAIK I don't know the BBC HD bitrate of
DVB-T2.
If anyone wants to record movies from ITV off Freesat use the West
Country feed as it usually has the best bitrate and screen format.
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