Originally Posted by RickD_99
Recently I decided to purchase a DVDO AVLab TPG to help automate my ChromaPure calibrations. As previously mentioned in this thread the DVDO with firmware 1.03 has the cool colorchecker feature which allows one to test whether or not your calibration source's output is bit perfect.
I believe someone mentioned earlier in the thread that the Oppo 203 4K player is bit perfect on output. Of course being the nerd that I am I had to confirm this with my own setup!
ConnecTEDDD was kind enough to send me a spreadsheet containing the expected YCbCr triplets for the CalMan color checker classic patches that are found on his excellent Ted's Lightspace CMS bluray disk version 1.1. So I set the Oppo 203 (on latest official 65-0131 firmware) to output [email protected]
fps, YCbCr 4:4:4, and 8 bits per channel. I set the DVDO to passthrough, connected the output cable from my Oppo to the DVDO input, and then hooked another HDMI cable from the DVDO output directly to the HDMI 2 input of my LG C6P OLED display. I then activated the colorchecker function on the DVDO and started measuring the YCbCr values of the CalMan color checker patches from Ted's bluray disk. The results are attached...as you can see all patches measured perfectly with no digital errors. This is important to me because I like to calibrate my LG C6 manually using Ted's ChromaPure specific patterns. I will now use ChromaPure in conjunction with the DVDO to automate all of the post calibration measurements.
Hi, I have performed the same test with OPPO 203/205 from drive and from USB, both players had bit-perfect digital output for YCbCr: https://www.avsforum.com/forum/149-b...l#post51029553
Some more info about how these kind of tests can be performed:
HDMI Video Signal Evaluation using Digital Pixel Analysis
For HDMI video output accuracy testing, the most accurate way is to use a device which can examine the HDMI Input signal pixels with digital level analysis.
There available some very expensive solutions for such testing in professional market, like Quantum Data 882EA-HDMI Video Generator / Analyzer, Tektronix WFM5250 SDI/HDMI Waveform Monitor or using Dolby's PRM-4200/4220 Professional Reference Monitors 'Pixel Cursor Display' function.
In the professional market but with more 'consumer friendly' price level, there two Reference Pattern Generators with Pixel Analysis capability: DVDO AVLab TPG 4K Reference Pattern Generator and Accupel DVG-6000 Ultra Plus (with Engineering Option).
Unfortunately, both products have been discontinued now.
DVDO can analyze SDR up to 1080p60 input signal while Accupel can analyze additionally HDR10 also, but its HDMI 2.0a Input board is limited to 10.2 Gbit data rates (not 18 Gbit).
DVDO's AVLab TPG 4K Reference Pattern Generator (Firmware 01.03.769) features a very useful feature called as 'Color Checker'.
Using that feature it can provide real-time digital value analysis (RGB or YCbCR value) of the selected pixel from DVDO cursor.
The top left corner of the cursor box indicates the position of the pixel being measured.
The cursor box can be moved around the screen to select the specific pixel/area to measure using the directional arrows on the AVLab-TPG.
This test can show if the pattern is solid or each pixel has different values from internal device processing.
Professional & Enthusiast calibrators has found this feature very valuable, to check the accuracy of any player output, testing various colorspace output options: