![]() xHE-AAC also has another name in the MPEG-D standard, and that's USAC, and that stands for Unified Speech and Audio Coding. FLAC and Apple Lossless have been available for file-based playback for quite some time. xHE-AAC is new to HLS in the 2020 releases, but it was available for file-based playback in the 2019-based releases. They are FLAC, which stands for the Free Lossless Audio Codec, and Apple Lossless. The other two audio codecs that are new to the 2020 OS releases are Lossless Audio Codecs. Bit rates below, say, 200 kilobits per second. And all of those adjectives are there to remind you that this audio codec is a very efficient audio codec at low to medium bit rates. That stands for Extended High-Efficiency Advanced Audio Codec. Let's discover the new audio codecs for the 2020 OS releases. The first topic, I'm going to introduce to you three new audio codecs that are new to HLS in the 2020 OS releases, and then I'm going to have a conversation with you about using two of these audio codecs in a multichannel setting. Go check that out, get familiar with the recommendations there, and come right back in here. So, if you need to, by all means, pause me. I encourage you to become familiar with the contents of that document before we get into this session. Together, in this session, we're going to discover how to deliver a better HLS audio experience.īefore we begin, I want to say that I'm going to provide to you some additional guidance that supplements the existing HLS authoring specification for Apple devices, a document that is available at. I'm Simon, and I'm a media streaming engineer here at Apple. Now, if you're looking to improve the data efficiency, and at the same time, the fidelity of your HLS audio streams, you've found the right session.
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