[vdr] OT: Finnish Yle HD olympics channel..

Pasi Kärkkäinen pasik at iki.fi
Tue Aug 12 15:26:10 CEST 2008


On Tue, Aug 12, 2008 at 04:18:15PM +0300, Seppo Ingalsuo wrote:
> Pasi Kärkkäinen wrote:
> >
> > Actually interlaced video kinda makes sense for sports and other live
> > video.. you get 50 fields per second, so the movement is smooth..  
> >   
> 720p50 or even 720p60 would give superior motion with in practise better 
> vertical resolution than 1080i. It would better to let the video encoder 
> lose data in a controlled way than rudely alternating between two 540 
> line fields with interlaced video. Also now when carbon footprint 
> matters it's insane to double every set top box / HDTV power consumption 
> at recipient side for doing magical motion vectors based tricks in 
> trying to restore the 1080 line image.


Yep, 720p50 or 720p60 is nice. 

25 or 30 fps is not enough.. that's why they do 1080i50 instead of 1080p25.

1080p50 would be excellent though :) Takes a lot of bandwidth also.. I guess
too much.


> > If you look at interlaced video on a progressive display, then you need to do pretty
> > heavy deinterlacing, preferrably using "full motion" methods to get 50 or
> > 100 fps output.. takes a lot of CPU. Check http://www.100fps.com
> >
> > Where did you get that stream from btw? 
> >   
> Recorded from Anixe HD yesterday.
> > Digita is broadcasting this channel as 720p in DVB-T.. dunno if it's 25 fps or 50 fps.. 
> > Hopefully not 25 fps..  
> >
> > In what format is that Arte HD? 
> >   
> 
> At the moment
> 
> VIDEO:  [H264]  1280x720  0bpp  50.000 fps    0.0 kbps ( 0.0 kbyte/s)
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
> ==========================================================================
> ==========================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> AUDIO: 48000 Hz, 2 ch, s16le, 256.0 kbit/16.67% (ratio: 32000->192000)
> Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
> ==========================================================================
> AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
> 
> But that was an old B/W film so not real HD content.
> 

I just checked a sample of DVB-T YLE HD and it seems to be:

VIDEO:  [H264]  1280x720  0bpp  50.000 fps    0.0 kbps ( 0.0 kbyte/s)
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)

AUDIO: 48000 Hz, 2 ch, s16le, 320.0 kbit/20.83% (ratio: 40000->192000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)

So yeah, 720p50 is nice :) 

-- Pasi



More information about the vdr mailing list