Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums > Pro AV Forum

Video question.

(1/2) > >>

Al Rettich:
Recently, I was asked to give audio support to a local community who showed a Star Wars movie on May 4. No issues with audio, but the Blu Ray player that was going through a ATEM switcher, wouldn't output video. Hook it directly up to the LEDD wall processor, no issues. Going through the ATEM didn't like it. They ended up playing it off a computer. I've always heard that the new media wouldn't play if there items downstream. So how does one get around this?

Tim McCulloch:

--- Quote from: Al Rettich on May 15, 2024, 01:49:03 PM ---Recently, I was asked to give audio support to a local community who showed a Star Wars movie on May 4. No issues with audio, but the Blu Ray player that was going through a ATEM switcher, wouldn't output video. Hook it directly up to the LEDD wall processor, no issues. Going through the ATEM didn't like it. They ended up playing it off a computer. I've always heard that the new media wouldn't play if there items downstream. So how does one get around this?

--- End quote ---

Don't use HDMI outputs.  SDI, NDI, even analog component video

The Black Magic ATEM Mini have the "smart" guts on input #1 - so all the EDID has to pass through it (along with scaling and other resolution/color space info).  Moving the DVD playback to another input may fix the issue or it may not.  But the issue is EDID/copy protection baked into the HDMI standard.

Brian Jojade:
You likely were running into the HDCP copy protection of the blu ray disc.  Essentially, to comply with the standards, the video signal has to go from the player to the TV with no splitting and no recording capabilities.

If you convert the signal into an analog signal, that would strip the digital copy protection out (albeit from a single generational quality loss that you probably wouldn't notice).

However, stripping copy protection brings in the whole discussion of legality of what you're doing.  In order to play Star Wars in a public setting (ie, anywhere except a private residence), permission is REQUIRED.

The real way to 'get around' this is to work with the copywrite owner and get a version that can be used for your purposes. 

Jonathan Kok:
Most Blu-Ray video will require all devices between the player and the display to be HDCP compliant (High Definition Copy Protection - ie- the downstream devices tell the upstream devices, 'Hi, I'm not a recording device, and I promise I'll block any of my output signals that I can't verify aren't recording devices'). Hollywood Movies? 1000%. ATEM switchers are NOT HDCP compliant. As such, the Blu-Ray player will BLOCK video output.

Same thing would happen if you were to try to play ANY HDCP content through an ATEM switcher off ANY device. I'm actually surprised that they were able to play it off a computer - was it a ripped disc, or did they download a ripped version and play that? The official Star Wars Blu-Ray should not have worked.  One thing I could think of is that it was a DVD. For a PC, whether HDCP is required on its output is dependent on what is being played. No HDCP? It'll go through the ATEM no problem. HDCP? Black screen.  For the Blu-Ray player, it may force HDCP full-time, irrelevant of content being played.  DVD's don't have HDCP, so it would play on the PC, but wouldn't on the Blu-Ray player.

How to get around this? Get an HDCP-compliant video switcher, and make sure your signal-chain from player to display is HDCP compliant.  Keep in mind that HDSDI CANNOT be HDCP compliant. However, some switchers (Roland, for example) have both HDMI and SDI outputs, with HDCP compliance available (and can be turned on/off). If you had used that, then the HDMI output would have had video (assuming all downstream devices are HDCP compliant), while the SDI output would not. This is because the Roland switcher can ask, and verify, if the connected HDMI devices are HDCP compliant. But it can't do that with the SDI devices. Since it doesn't know, it blocks output.

CATx based HDMI extenders are typically HDCP compliant.

Erik Jerde:

--- Quote from: Al Rettich on May 15, 2024, 01:49:03 PM ---Recently, I was asked to give audio support to a local community who showed a Star Wars movie on May 4. No issues with audio, but the Blu Ray player that was going through a ATEM switcher, wouldn't output video. Hook it directly up to the LEDD wall processor, no issues. Going through the ATEM didn't like it. They ended up playing it off a computer. I've always heard that the new media wouldn't play if there items downstream. So how does one get around this?

--- End quote ---

ATEM doesnít support HDCP.  Need a better switcher if youíre going to do this sort of thing.

Honestly, playing back from a blu-ray player is kinda hokey for a professional event.  Iíd rip the video and play it back from a proper media server.  Thatís much more reliable than a disc player.

Navigation

[0] Message Index

[#] Next page

Go to full version