[M4IF Technotes] Common ways to evaluate encoded video quality?

[Howard Stateman]

What we saw was the average person preferred smooth, slightly 
blurred moving images to sharp, slightly jerky video. When we 
asked about this, our subjects said they liked the "movie" 
feel as opposed to a "videotape" feel. 
We also saw that when the audio was clearer and richer, they 
rated the video as being better as well, even though we had 
simply patched better audio onto the same video stream. 
As for the controls, we embedded the players in a web page 
with no controls, so the non-experts were unable to tell 
which company's product they were viewing. 
Mind you, we did not do a scientific study, so your mileage may vary.
 ---------------
The contents of this message contain the personal opinions of 
the author, and do not reflect the policies or position of 
Sony Corporation, its employees or subsidiaries.
> > -----Original Message-----
> > From: technotes-admin   lists.m4if.org
> > [mailto:technotes-admin   lists.m4if.org]On Behalf Of Robert Bleidt
> > Sent: Tuesday, June 24, 2023 11:35 AM
> > To: 'M4IF Technotes'
> > Subject: RE: [M4IF Technotes] Common ways to evaluate encoded video
> > quality?
> > 
> > 
> > Are you saying they were influenced by parameters of the 
> > video that your 
> > panel didn't weight as highly, or was it not a double-blind 
> > test - they 
> > were influenced by brand equity, control interface, etc.
> > 
> > One problem I have had in the past is that it is difficult to 
> > conduct a 
> > double-blind test with any of the proprietary formats as 
> > displayed on a PC, 
> > as there is no easy way to "record" their reconstructed 
> > output. Some PC 
> > video cards do have a down-converted video output that can 
> > feed a VCR, but 
> > usually these outputs add artifacts of their own. We need 
> > something like 
> > www.totalrecorder.com for true motion video. I have ended up 
> > sometimes 
> > putting a cardboard mask over the screen to reveal just the 
> > video window.
> > 
> > Has anyone solved this problem?
> > 
> > At 09:41 AM 6/24/2003 -0700, Howard Stateman wrote:
> > 
> > >Even though it was clear to the experts that my company's 
> > video was sharper,
> > >more color-accurate and had fewer artifacts in high-motion 
> > frames, the
> > >non-experts (a.k.a. potential customers) liked the 
> > competion's video better.
> > >We discovered the huge role which psychology has to play 
> in percieved
> > >quality of streaming media.
> > 
> > Robert Bleidt   - rbleidt   hdtv.com  
> > 
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