[gst-devel] framerate and deinterlace2

Julien Isorce julien.isorce at gmail.com
Sat Dec 13 13:11:39 CET 2008


Thx for those informations.

A video source running at 1080i @ 30 frames per second (that is, 60
> fields per second) uses exactly half the bandwidth as 1080p @ 60
> frames per second.

> To the end viewer, they appear equally fluid, because they both
> *appear* to be running at 60 frames per second. The non-interlaced
> format will provide twice the vertical detail but will use twice the
> bandwidth.
> There are no blank lines when interlaced video is transmitted
> digitally. Two adjacent fields in a 1080i picture, each measuring
> 1920x540 pixels, are combined to form a single frame measuring
> 1920x1080 pixels, where the even-numbered horizontal lines form one
> field and the odd-numbered horizontal lines form another. The same
> concept applies to standard-definition 480i video.
> > So I do not understand why 1080i still exist because interlacing was
> > iniatilly used for CRT tv to avoid flickering.
> > So what are the reasons to use interlace mode in a full numeric chain ?
> > (source, transport, visual)
> I think it had to do with the fact that many early HDTVs were
> CRT-based. Bandwidth requirements may have come into it.
> > What's the most usual deinterlacing method used in FULL HD screens ?
> Probably line doubling.
> --Brian
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