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Image doubling with HD1020 players

JRB Technical

May 15, 2018 05:03

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Curious if anyone else has seen this.

I had a HD1020 player connected to a Panasonic AW-HS50 Switcher (DVI Input).

When displaying a still image with clear lines, I noticed that about every approximately 7-10 seconds, the image would double about 3 pixels higher than the original, and stay this way for about 7-10 seconds then go back to normal.

I though this might be something to do with displaying a PNG image versus video, so I made a video of the same image, and it did the exact same thing. I also tried another HD1020 player I had with me as a backup, same thing with both still PNG and Video.

I also tried forcing different video refresh rates, no change. And also going through a Decimator MD-HX to (HDMI to SDI) into the AW-HS50.

I brought out a XT1143 the next day, and loaded the same presentation, and everything played fine with the still images and videos. I never saw this image doubling effect with the XT1143.

So something about the older HD1020 players and the AW-HS50 that they don't like to play together?

I've been using the HD1020's for quite a while, and I have never seen anything like this before. Just trying to understand what might have caused this, and how to prevent in the future, and if anyone has ever seen anything like this before.

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3 comments

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  Shaun May 15, 2018 12:56

  That is indeed interesting! Given that you are feeding a Frame Sync on the switcher side I would say the incoming signal is drifting in some fashion. Generally speaking I've had no trouble plugging BrightSigns into broadcast gear which have been useful for holding slides or as a quick and nasty video play-out.

  Do you get the same behavior at different frame rates? Is there any EDID nonsense going on via the DVI port overriding the frame-rate on the output of the HD1020?

  The MD-HX should tell you what it thinks is coming into to it and also remove the EDID as SDI doesn't know or care about it. So, this would tend to point to the video output of the HD1020.

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  JRB Technical May 15, 2018 15:07

  This was a Rental & Staging gig, so I didn't have time to try every possible combination.

  The  AW-HS50 was set for 1080/59.94i so that is what I set the HD1020 to for the DVI input.  Direct connection with brand new BlueRigger HDMI to DVI cable.

  I tried a few different resolutions using the scaler in the MD-HX, it correctly reported the resolutions from the HD1020, but the scaled 1080/59.94i SDI image was still exhibiting this doubling issue.

  Usually I connect directly to displays. The only other time I went through a scaler was I had a Absen LED wall with a ImagePro JR about a month ago, using a 4K1142 and I didn't see anything like this with that setup. So I would suspect that the 4K players are also ok, and it is something with the HDx20 players in this type of setup.

  For most video and graphics content, it might not be easy to spot. I may not have noticed if it weren't for the fact that I had a test pattern up with fine 1 pixel lines in it up on a 90" LCD when I saw it the first time.

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  Shaun May 16, 2018 05:40

  Safe to say it is on the player side. Good to have this as a reference though. I haven't seen any issue with newer players when lining them up using single pixel lines.