Barry Goyette
 lvl.4
Flight distance : 14928 ft
United States
Offline
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charlesetischer Posted at 2018-3-19 23:01
The X7 comes out of box with the CineCore 2.1, whose D-Log design is targeted at recording as much as 15 stops of dynamic range in a 10-bit ProRes encoding. A bitrate of about 1 Gbps is needed to avoid compression artifacts with the refreshed D-Log and D-Gamut. The MicroSD supports only up to 100Mbps 8-bit 4:2:0 predictive encoding. It is almost impossible to encode 15 EV dynamic range in 8 bits. The MicroSD cannot be used to record the same D-Log as in CINESSD. Compression artifacts unacceptable to professional works would be found if the MicroSD were used to record D-Log. The best profile to use without a CINESSD if you still want to have a bit headroom for the post is the D-Cinelike.
Hi Charles. I believe you work at DJI. I agree that the current EI mode version of D-log is "no bueno" in 8 bit. Which makes it curious why DJI enabled EI mode D-log on the SD card, when an SSD is inserted into the I2, seeing, as you say, it's impossible to make it work. I mean, It should be either one or the other, right?
I've been trying to tell skyris that he really doesn't want what he's asking for, because those that have D-log on the SD card, know that it's completely broken, and have absolutely no use for it...in fact...we have no use for any of the footage off the sd card when the SSD is recording EI mode...because the rec 709 is just as messed up. Are there any plans to make the footage on the SD card usable in anyway when recording EI mode to SSD? It seems odd to have a system that requires the SD card to be inserted in order to record on the SSD, but then. have the footage recorded to that SD card be essentially worthless.
As a professional, I appreciate the improvements made in cinecore 2.1, I really do, but it does seem odd that, pre EI mode, there was a d-log, and that it worked just fine on both cards. It seems that if you turn EI mode off with the handy go4 switch, there should be no reason why d-log can't exist as it did before. |
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