[mythtv-users] Commercial PVR offerings - is MythTv still competitive ?

[Steve Hodge]

On Wed, Feb 11, 2009 at 10:57 PM, Paul Gardiner <lists at glidos.net> wrote:

> Steve Hodge wrote:
>
>> On Wed, Feb 11, 2009 at 4:50 AM, Paul Gardiner <lists at glidos.net <mailto:
>> lists at glidos.net>> wrote:
>>
>>    5. Getting full advantage from 1080i ? A lot of people seem to report
>>    using Bob, in which case they presumably aren't really getting the
>>    extra resolution (which is after all why some programs use 1080i
>>    in preference to 720p).
>>
>>
>> Why would they not be getting the extra resolution when using Bob? Are you
>> thinking of "One Field"?
>>
>
> Bob uses line doubling, doesn't it? Even the frames displayed by "Bob
> deint without the bob" are derived from single fields as far as
> I know.
>

Correct, but there are twice as many frames since each field in the source
becomes an entire frame in the output. 1920x1080 at 30 effectively becomes
1920x540 at 60: same number of pixels per second. Every line from the
interlaced source is displayed - nothing is lost.

Of course there are better deinterlacers than bob - it's possible to
interpolate extra lines by analysing the surrounding frames (or even just
smoothing the doubled lines). But those deinterlacers are not showing pixels
that bob is discarding, rather they are producing pixels that aren't
actually in the source (they're only implied by the source).

Regards,
Steve
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