HDMI EDID hack to allow 5.1 passthrough

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nbd
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by nbd » Tue Feb 08, 2011 7:17 am

Hello, what's the point? If the EDID info is stored on the chip ROM (or similar non-volatile memory), it will stay there even without real power.

DEvil0000
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Joined: Tue Feb 14, 2012 2:35 pm

Re: HDMI EDID hack to allow 5.1 passthrough

Post by DEvil0000 » Mon Apr 16, 2012 6:13 pm

hi there,
i tryed it yesterday with my ati hd mobile and my b series tv but not working till now.

any news to this topic?
is there a solution for this till now?
i mean solving this via software not hardware.

nbd
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by nbd » Sat Apr 21, 2012 7:05 am

No. This needs experts and proper hardware knowledge. I don't think the EDID info is writeable from TV software.

Anaerin
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by Anaerin » Tue May 15, 2012 1:20 am

Apparently, it is, if you DISABLE EDID from the debug menu (which disables protection), and use PowerStrip - The registered version has the unsupported feature that you can update EDIDs through it, if you contact the makers after buying the registered version to get the unlock pin for that feature: http://www.avsforum.com/avs-vb/showthread.php?t=1280874

chaosmaker
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by chaosmaker » Tue Jun 26, 2012 8:25 pm

Any updates? Or has this been closed completely?

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prairie
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by prairie » Wed Jun 27, 2012 3:09 pm

I am a little confused by this topic. My D-series allows 5.1 passthrough to the optical output without any sort of modifications. I currently have the following devices sending 5.1 through to optical out:

1. PS3 (5.1 only, DTS does not get passed)
2. AppleTV
3. Motorola QIP 6416 FiOS (requires passthrough be selected in device set-up menu)
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nbd
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by nbd » Fri Aug 10, 2012 12:55 pm

I don't think DTS passthrough is possible. I have a device that can fake EDID info and it is configured according to my audio receiver which can receive DTS, this way I can get my bluray player to send DTS to the TV, but nothing comes out.

mattberlin
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by mattberlin » Sat Jan 12, 2013 6:04 pm

Well, I have never noticed that 5.1 is not passed through. Thank's for telling me. Well, seems as if one has to connect directly to AV receiver.
my TV: LE32B679

nbd
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by nbd » Wed Jan 16, 2013 10:53 am

5.1 AC3 gets passed, that's not the issue. DTS does not, thats another issue. The problem is that most devices don't even bother to send the AC3 to the TV, since they think it won't play it.

zanfur
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Re: HDMI EDID hack to allow 5.1 passthrough

Post by zanfur » Thu Dec 19, 2013 11:21 am

This is actually possible, as I've just verified using some non-trivial number of hours of testing.

I have an F6300 series, and examining the E-EDID information it advertises that it only supports PCM 2.0 16/20/24b depth at 48kHz and that it only has front right/left speakers (which is, in all fairness, the truth...). So, any device using autodiscovery, which is nearly all of them, will only send it PCM 2.0 in the first place.

However, if you can override a device's discovery mechanism and force it to output DTS or AC3, the tv will pass that along. Basically, it does zero audio decoding, just passes it straight along. This means you get static unless your receiver is decoding, of course. Note that this is only DTS over an optical, not DTS-HD, because you can't run DTS-HD over optical due to cable bandwidth limitations -- just AC3 5.1, DTS 5.1, or PCM 2.0.

I was able to construct an E-EDID block that claimed to support a 5.1 speaker setup with AC3 and DTS support and convince my windows installations (three different computers) to use this fake E-EDID instead of the one it got from the monitor, and I was successfully able to pass AC3 from the computer --hdmi-> TV --optical-> receiver, and output 5.1 sound. If I were able to flash this E-EDID to the tv itself, I wouldn't even have to override the connected devices' autoconfiguration...but it would hardcode the TV to support only whatever I put in the E-EDID. The *proper* way to do this would be for Samsung to discover the capabilities on the attached receiver, and advertise *that*...but that requires dynamically updating the TV E-EDID when new receivers are connected to the ARC channel, and I don't think that'll happen anytime soon. The autodiscovery wouldn't work for optical out, of course, though a menu allowing us to configure the optical capabilities would be grand.

For those curious how to override their E-EDID information on Windows XP and higher, check out EnTech's "MonInfo" which can extract E-EDID information from the TV and can create override driver files from binary E-EDID blocks, and Deltacast's "E-EDID Editor" which allows you to edit those extracted binary E-EDID blocks, which you can then open in MonInfo and use to create override driver files. No, I won't post my E-EDID file, because it's unit-specific (not just model) -- extract your own E-EDID and modify it.

Note that most computers don't actually encode to AC3 or DTS for sound output (though they'll pass it along if that's the source encoding), just PCM, so unless you have a dolby digital live encoder in your sound output stack you still won't be able to get 5.1 through the optical. It should work thoguh ARC, though, even just using PCM. N.B. -- I haven't tested audio return through ARC, just optical, so this last is just conjecture.

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