[Cin] Is the Waveform properly calibrated ?

[Andrew Randrianasulu]

В сообщении от Friday 20 November 2020 03:33:10 Pierre autourduglobe via Cin написал(а):
> 
> I just checked under Cinelerra-CV 2.3...
> 
> The display has the same calibration problems. The white square is not 
> displayed at 100 IRE.
> 
> Contrary to the CinGG Waveform there is the option (identified "Y'CbCr") 
> to display two horisontal lines corresponding to the levels 7.5 and 
> 92(?) IRE.
> 
> Unfortunately even these lines do not seem to correspond to the values 
> displayed by the Colors bar.

Does ffmpeg's filter work as intended?

https://trac.ffmpeg.org/wiki/WaveformMonitor

if yes, we probably can look how it works rel. to Cinelerra's .....


> 
> Pierre
> 
> 
> Le 20-11-19 à 18 h 47, Andrew Randrianasulu a écrit :
> > В сообщении от Friday 20 November 2020 01:51:29 Pierre autourduglobe via Cin написал(а):
> >> When I analyze a sequence of SMPT ntsc SD color bars generated by my DV
> >> camera. The Waveform correctly indicates that the black bands are at 7.5
> >> IRE but places the white band at around 92 IRE instead of 100 IRE and
> >> the colored bands around 70 IRE instead of 75 IRE...
> >>
> >>
> >> This in a project in DV ntsc YUV 720x480 format with the preferences
> >> "YUV colors space" to BT601 and "YUV color range" to JPEG.
> >> If you choose instead the preference "YUV color range" in MPEG, the
> >> white band is correctly at 100 IRE and the colored bands are 75 IRE,
> >> but... the black bands are now wrongly at 0 IRE...
> > Unfortunately I don't even know off-head what IRE mean in this context ...:(
> > 
> > But yes, there is possibility some settings not applied uniformely
> > (because whole jpeg/mpeg thing was  implemented relatively lately in Cin's life)
> > 
> > 
> > You might try other Cin forks and see if they behave correctly...
>