![]() ![]() Perhaps you were thinking of DTS inside DTS-HD?Į-AC3 can have a legacy AC-3 bitstream embedded in it (E-AC3 audio in Blu-Rays does have it), but I admit I was confused with regards to whether its presence is mandatory. E-AC3 decoders are required to be backwards compatible with AC3 streams, but not the other way around - AC3 decoders can't decode any part of the E-AC3 bitstream, because there is no AC3 "base payload" inside them. There is no legacy AC3 stream within the E-AC3 stream. Quote from: kurkosdr on 23:28:21 Is there a patent list (and anticipated expiration date) for "demuxing" the legacy stream inside the E-AC3 stream to AC3? That said, I'd rather keep this thread focused on E-AC3 patent decision, not general Dolby hate. Also, for ATSC 3.0, you need both a Dolby AC4 license and a MPEG-H 3D Audio license so no patent racket feels left out of the royalty payments. Or as if a 50Kbps saving per stereo audio stream matters, considering HEVC 4K video requires bitrates upwards of 10Mbps (so, the savings are 0.5% of the total bitstream at best for single-language content or 1.5% at best for multi-language content, hooray!). As if any terrestrial broadcaster will ever broadcast 3D audio when most of them aren't even broadcasting 5.1 audio. The sad thing is that Dolby (along with complicit broadcast regulators) are continuing the charade of making their patented formats essential to decoding public TV signals (even ones you may have already paid for via your public broadcaster levy/TV license) under the excuse of 3D audio. PS I maintain FOSS that decodes Dolby formats using FFmpeg. Quote from: kode54 on 07:52:55 F**k you, Dolby! ![]() You really need an E-AC3 decoder (or at the very least, "demuxer") to watch terrestrial TV in some EU countries. PS: The DigitalBitrate website can tell the difference between AC3 and E-AC3 (example of AC3 identified here), so the examples above are not a case of a misidentified stream. Best I can find is that E-AC3 was a mandatory format for HD-DVD, and since the first HD-DVD player was released on 31st March 2006 (and has a "Dolby Digital Plus" badge), this gives us a "worst case" date of 31st March 2006 when it comes to prior art. Even Wikipedia doesn't have that information. In fact, even pinpointing a "release date" for E-AC3 has also been impossible for me. All I can find is people talking about the expiration of AC3 patents and a ETSI patent declaration from 2004 (which, considering how old it is, I am not sure it covers E-AC3). I've tried Googling around and there is no information on the subject. Is there a patent list (and anticipated expiration date) for decoding E-AC3 (with the extra channels etc)? ![]() Is there a patent list (and anticipated expiration date) for "demuxing" the legacy stream inside the E-AC3 stream to AC3? E-AC3 (aka Dolby Digital Plus) is used exclusively for some terrestrial television broadcasts in Europe. ![]()
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