Tag Archives: codecs

Opus Codec

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Opus 1.1 includes:

  • new analysis code and tuning that significantly improves encoding quality, especially for variable-bitrate (VBR),
  • automatic detection of speech or music to decide which encoding mode to use,
  • surround with good quality at 128 kbps for 5.1 and usable down to 48 kbps, and
  • speed improvements on all architectures, especially ARM, where decoding uses around 40% less CPU and encoding uses around 30% less CPU.

These improvements are explained in more details in Monty’s demo (updated from the 1.1 beta demo).

via Opus Codec.

From the Xiph.org developers

Opus is a codec designed for interactive usages, such as VoIP, telepresence, and remote jamming, that require very low latency. In this test Opus is running with 22.5ms of total latency but the codec can go as low as 5ms. Making a codec for low latency requires serious tradeoffs which reduce efficiency, so it might seem a bit strange to test it against a collection of state-of-the-art codecs which are completely unsuitable for these low-latency applications.

Open-Sourced H.264 Removes Barriers to WebRTC

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The industry has been divided on the choice of a common video codec for some time, namely because the industry standard–H.264–requires royalty payments to MPEG LA. Today, I am pleased to announce Cisco is making a bold move to take concerns about these payments off the table.

We plan to open-source our H.264 codec, and to provide it as a binary module that can be downloaded for free from the Internet. Cisco will not pass on our MPEG LA licensing costs for this module, and based on the current licensing environment, this will effectively make H.264 free for use in WebRTC.

via Open-Sourced H.264 Removes Barriers to WebRTC.

New video codec to ease pressure on global networks

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The new codec will considerably ease the burden on global networks where, by some estimates, video accounts for more than half of bandwidth use. The new standard, known informally as ‘High Efficiency Video Coding’ (HEVC) will need only half the bit rate of its predecessor, ITU-T H.264 / MPEG-4 Part 10 ‘Advanced Video Coding’ (AVC), which currently accounts for over 80 per cent of all web video. HEVC will unleash a new phase of innovation in video production spanning the whole ICT spectrum, from mobile devices through to Ultra-High Definition TV.

via New video codec to ease pressure on global networks.

Speex: a free codec for free speech

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Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs. Finally, Speex is part of the GNU Project and is available under the revised BSD license.

via Speex: a free codec for free speech.

Used for Siri.