req help to identify PAL interl. video

[krbo]

Hi,

I'm looking for some help of more experienced PAL interlace gurus.

Recently provider for our national TV changed a lot of equipment , mpeg2 encoders
, statistical mux now is used and DVB-S video chnaged a lot.

Once it was nice easy clean interlaced CBR video with GOP 12 size, now it's something
which puzzles me and I'm not a newbie in progressive/interlace video world.

Signal now (as dgindex reports) is full of progr/interl frames so help is needed
first to identifty properly what kind of video it is and second an advice what to do
to properly deniterlace it (or even to suggest a provider what to change or where
to look to restore quality of picture like it was before, they are willing to help but
so trained yet with new equipment)

The biggest problem is that picture on TV is much less sharp the before.

I've prepared a short (970 frames, 8Mb) m2v clip here:

http://rapidshare.de/files/11183850/HRTTV2_cut.m2v.html

clip is ProjectX demuxed TS stream, cut with Mpeg2Schnitt on I frame
boundaries

thanks !

krbo

[Guest]

It looks pretty ordinary to me -- just plain old PAL video.

If you're wondering why the encoding is sometimes progressive and sometimes interlaced, be aware that content broadcasters prefer to minimize bitrate as a strong criterion. A good encoder tries all picture structures for each frame and selects the one that has the smallest encoding (while maintaining some minimum image quality of course).

You also have the problem of chroma upsampling. You have to know if the YV12 sampling was honoring the progressive/interlaced frame property, or whether it was fixed at one or the other. That's why I now always use an adaptive upsampler, such as AutoYUY2().

[krbo]

It looks pretty ordinary to me -- just plain old PAL video.


tnx for looking !


If you're wondering why the encoding is sometimes progressive and sometimes interlaced, be aware that content broadcasters prefer to minimize bitrate as a strong criterion. A good encoder tries all picture structures for each frame and selects the one that has the smallest encoding (while maintaining some minimum image quality of course).


I'm well aware what statistical multiplexer will do from 12 programs to pack
them inside transpoder max bitrate from prog/interl mix to GOP size showtime.


That's why I now always use an adaptive upsampler, such as AutoYUY2()


Read the thread, nice solution for those mix videos but what with YV12 upsampling ? (HC encoder)

Maybe AutoUp(plane) , plane=YUY2,YV12,RGB24 in the future ?

regards,

[Guest]

Read the thread, nice solution for those mix videos but what with YV12 upsampling ? (HC encoder) AutoYUY2() takes YV12 and outputs adaptively upsampled YUY2. If you need RGB, apply a subsequent core conversion.