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April 9th, 2015, 02:54 AM | #1 |
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HDMI/SDI Output - X70 vs AX100 vs CX900
I've looked high and low for an answer to this, but have unfortunately come up dry.
I know the CX900 and AX100 record internal 4:2:0, but does the HDMI bypass the compression and output true 4:2:2, or is it also 4:2:0? (I realize the X70's SDI output is 4:2:2) Thanks! |
April 9th, 2015, 04:06 AM | #2 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
I tried to find that out also, for the FDR-AX100. Contacted Sony and they said they won't give that info out.
The HDMI outputs a signal in all recording modes except 4K. I'm guessing that it's not any better than what gets written to the card, since they don't advertise this spec. It would be a good selling point if it was better quality. Mark |
April 9th, 2015, 07:19 AM | #3 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
[QUOTE=Mark Watson;1882627..... It would be a good selling point if it was better quality.
Mark[/QUOTE] Why on earth would they do that ? The reason it is lower cost is because it is missing features that are on the more expensive products. That is why they cost more. If you want 4:2:2 4K buy the FS7 or the PXW-X100. You then get 50/60P as well as many other features. Companies go broke if they give too much away. I want Sony to stay around. Since the AX100 and the X70 are based on the same core there has to be some real differences. Ron Evans |
April 9th, 2015, 07:48 AM | #4 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
You're forgetting the A7s. That outputs 4K HDMI and a Shogun or Odyssey 7Q+ will be able to capture that in what we presume is 4:2:2.
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April 9th, 2015, 08:10 AM | #5 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
Unless manufacturer's give us details (which, IMO they really should), it's all guess work. I know I've had a terrible time gathering specs on occassion.
From what I can tell about the A7 mentioned, that would output 8-bit 4:2:2 over HDMI. The X70 of course outputs 10-bit 4:2:2. If a manufacturer fails to provide specs, I think a good assumption to make is that the output bit-depth would be the same as the in-camera bit-depth. It's then a 50-50 chance that the subsampling would be better via HDMI as compared to in-camera. |
April 11th, 2015, 11:32 AM | #6 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
I did some testing with the AX100 and BMD Hyperdeck Shuttle 2. Even though the camera outputs on the HDMI when in an HD recording mode, the output seen by the recorder is either 1080i or 720p.
Mark |
April 11th, 2015, 03:39 PM | #7 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
The output format for HDMI can be set in the menu . Can be Auto, 2160p/1080p, 1080p, 1080i or 720p. I do not have a 4K TV but my TV/Monitor identifies the others as I set them in the FDR-AX100 menu so maybe the problem is with the BMD Hyperdeck Shuttle. HDMI needs a proper handshake to operate I think.
Ron Evans |
April 11th, 2015, 05:45 PM | #8 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
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April 11th, 2015, 06:31 PM | #9 | |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
Quote:
Mark |
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April 11th, 2015, 08:17 PM | #10 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
Yes in record mode at least to my Viewsonic 23LED monitor which shows what it thinks the signal is that is coming over the HDMI. The camera was actually recording 1920x1080 60P XAVC-S and I then changed HDMI outputs to all the choices one after the other. As the change was made the Viewsonic reported the change. As a double check I switched the Monitor to another input and when switched back to the input from the AX100 it again confirmed what was the input choice for each of 1080i, 1080P or 720P . Of course I can only report what the Monitor says not what the actual stream is that is being measured.
Ron Evans Edit: Just repeated the tests with my 7" MustHD monitor which reports exactly the same as the Viewsonic 23LED monitor so I think the issue is with your BMD Hyperdeck Shuttle. |
April 11th, 2015, 08:34 PM | #11 |
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Re: HDMI/SDI Output - X70 vs AX100 vs CX900
The Shuttle should have been able to record the 1080p modes. Maybe mine's busted.
Mark |
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