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...