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Old 06-02-09, 08:02 AM   #73
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Join Date: May 2008
Posts: 166
Default Re: VDPAU testing tool

Originally Posted by crisalide View Post

If you can provide a 720p MPEG2 sample, i would add 720p mpeg decoding test. (never seen any until now)
Pure US ATSC transport stream, KCTS, Seattle.

ID                               : 68 (0x44) 
Menu ID                          : 1 (0x1) 
Format                           : MPEG Video 
Format version                   : Version 2 
Format profile                   : Main@High 
Format settings, Matrix          : Default 
Duration                         : 2mn 21s 
Bit rate mode                    : Variable 
Bit rate                         : 10.3 Mbps 
Nominal bit rate                 : 19.4 Mbps 
Width                            : 1 280 pixels 
Height                           : 720 pixels 
Display aspect ratio             : 16/9 
Frame rate                       : 59.940 fps 
Colorimetry                      : 4:2:0 
Scan type                        : Progressive 
Bits/(Pixel*Frame)               : 0.187 
Stream size                      : 174 MiB (90%) 
ID                               : 69 (0x45) 
Menu ID                          : 1 (0x1) 
Format                           : AC-3 
Format/Info                      : Audio Coding 3 
Duration                         : 2mn 21s 
Bit rate mode                    : Constant 
Bit rate                         : 384 Kbps 
Channel(s)                       : 6 channels 
Channel positions                : Front: L C R, Surround: L R, LFE 
Sampling rate                    : 48.0 KHz 
Stream size                      : 6.47 MiB (3%) 
Language                         : English 
Language, more info              : Hearing impaired

Originally Posted by jyavenard View Post
US ATSC is 29.976 fps or 59.94Hz interlaced.

It's the framerate per second that is relevant... Because it's interlaced, a full frame is made of 2 interlaced ones.
60Hz interlaced = 30 fps.
50Hz interlaced = 25 fps
60Hz progressive = 60 fps, but this is never broadcast, the best that can be broadcast is 60Hz interlaced or 30 fps.
Here's where we differ. A field is one-half of the picture, every other line. So the field rate must be twice the full frame-rate in order to populate it.

My 9300 has tested out at a miserable 33 fields/s for Advanced, when the fieldrate for 1080i is 59.94 Hz. I'm not being stubborn, these are the numbers. It appears that my card can not handle 1080i with Advanced deinterlacing, but it's not clear to me how this relates to Advanced 2X and Advanced 1X deinterlacing settings in MythTV.

It does appear that my 9300 can handle 1080i using Temporal, since it tests at 109 fields/s, but what does this mean WRT 2X and 1X?

And finally it appears my Quadro can handle Advanced for 1080i, at 90 fields/s.
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