Know How to Manually Confirm the bit-level Supported via HDMI Out?

CogDiv wrote on 3/10/2017, 3:29 PM

I first suspected an octal dump (od) inspection in Linux of a 10-bit recorded HDMI stream may help, but then realized knowing the encoding layout would probably be required.

Some here have the Sony FDR-AX100, and have posted that it has an 8-bit HDMI out. How exactly has this been confirmed?

This site states the RX10 III also has an 8-bit output, but how has that been confirmed? I cannot seem to find the true specifications for HDMI output on either model from Sony.

For now and the future, other than obtaining perhaps the HDMI standard used on the output (which is also hard to verify), how can the number of bits output from a device be verified manually via a 10-bit recording?

Comments

CogDiv wrote on 3/10/2017, 7:03 PM

DSC-RX10M3 Support Documentation

Marketing Specifications

Recording:  Color Space:  sRGB, Adobe RGB //For stills . . .
Exposure System:  D-Range Optimizer:  Off, Dynamic Range Optimizer (Auto/Level 1-5), Auto High Dynamic Range (Auto Exposure Difference, Exposure difference Level (1.0-6.0EV, 1.0 EV step)) //Again, possibly just for stills . . .

* HDMI is not even mentioned under "Interface," but it is micro HDMI for sure.  The standard/revision?  Not sure.

Help Guide

Identifying Parts:  Back view:  6.  HDMI micro jack
HDMI Resolution:  2160p/1080p:  Outputs signals in 2160p/1080p
4K Output Sel. (movie):  HDMI Only(30p)
4K Output Sel. (movie):  HDMI Only(24p)
4K Output Sel. (movie):  HDMI Only(25p)
Using the preset of the picture profile:  PP7: Example setting using [S-Log2] gamma.
Gamma:  Cine1:  = HG4609G33
Gamma:  Cine2:  = HG4600G30
Gamma:  ITU709
** Gamma:  ITU709(800%):  Gamma curve for confirming scenes on the assumption of shooting using [S-Log2].
** Gamma:  S-Log2:  Gamma curve for [S-Log2].  This setting is based on the assumption that the picture will be processed after shooting.

Color Mode:  Cinema:  Suitable colors when [Gamma] is set to [Cine1]
Color Mode:  Pro:  Similar color tones to the standard image quality of Sony professional cameras (when combined with ITU709 gamma)
** Color Mode:  S-Gamut:  Setting based on the assumption that the pictures will be processed after shooting.  Used when [Gamma] is set to [S-Log2].
 

** AHA!  This actually suggests the HDMI signal is 8-bit (dynamic range limited), so use S-Log2 for shooting and use a LUT to convert into the 10-bit color space on the recorder!

No further information in the Instruction Manual.

Agree?  Further analysis?  

Still not sure on the AX100, but probably close to the same scenario; log over an 8-bit HDMI signal out, if 4K output monitoring is possible with Log on (when not recording in camera).

Still would be nice to be able to manually verify whether a 10-bit file was recorded using the full 10-bit range and not just the 8-bit range. Perhaps there is a way to verify using color monitors in DaVinci Resolve . . .