News

I'll be at the Consumer Electronics Show in Las Vegas on 6th and 7th January 2011, with a demo of the new OneCodec concept (beamshare.com). If you would like to meet me, let me know ([email protected]).

The JCT-VC have specified the first version of the Test Model for the new HEVC standard. The Test Model, HM1, will gradually evolve into the final version of the new standard as coding tools are evaluated + added to it. I've posted a summary here together with a link to the JCT-VC document site.

So far, indications are that HEVC will deliver around 2x better compression compared with H.264/AVC, at the expense of a big increase in computational complexity. By the time the new standard is published (around 2013), the hope is that this increased complexity will be well within the capabilities of consumer devices.

There will still be many people who question the need for a new video coding standard. That's why we are developing the Beamshare concept, so that you can deliver improved video coding performance as and when it's needed, without the high cost of switching over to a completely new standard.

Sign up for my next webinar, "getting the best out of H.264", a one-hour presentation on 17th Nov 2010 at 4.30pm GMT (that's 8.30am Pacific time and 11.30am East Coast time in the US). It's free to attend and you get the chance to ask questions during the talk.

Register here:
https://www.brighttalk.com/webcast/1367/23533

- Iain

I'm in Boston, giving a talk at the Embedded Systems Convention on Wednesday 22nd September at 4.30pm, with my colleague Maja Bystrom.

We'll be talking about our work on Configurable Video Coding. By exploiting the increased flexibility of programmable processors, a configurable video codec can handle multiple video formats using a single coding “engine”, making efficient use of system resources and reducing the time-to-market for new systems.

I'll be at ESC on Tuesday 21st and Wednesday 22nd September.

- Iain

Still time to register for tomorrow's book launch (16 June, 4pm UK time). I'll be giving a 30-minute presentation and answering any questions from viewers. Click to register:
https://www.brighttalk.com/webcast/5071/21438

After the talk is over, you will be able to re-play it using the link.
- Iain Richardson.

The new book has been available in the UK for a few weeks and should be available in the US and the rest of the world in June. I will launch the book via a free webcast on Wednesday 16th June 2010 at 4pm BST / 8am Pacific time / 11am East Coast US time. During the half-hour webcast I will give a brief overview of the main chapters. Participants will have the opportunity to post questions which I will answer during the talk. Click here to register for free:
https://www.brighttalk.com/webcast/5071/21438

- Iain Richardson

Work is continuing on the new video coding standard, currently known as "High Efficiency Video Coding" (HEVC). A Joint Collaborative Team on Video Coding (JCT-VC) has been set up by ISO/IEC MPEG and ITU-T VCEG. Following a Call for Proposals in January, 27 proposals were submitted to the first meeting of the JCT-VC in April. Elements of some of these proposals have been combined to develop an initial Test Model, a starting point for development of the new standard. The initial Test Model has similarities to earlier standards such as H.264/AVC, including block-based intra/inter prediction, block transform and entropy coding. New features include increased prediction flexibility, more sophisticated interpolation filters, a wider range of block sizes and new entropy coding schemes. Coding performance varies across the different proposals. It looks like we might expect to see a 2x compression improvement compared with H.264/AVC (i.e. half the bitrate at the same visual quality), at the expense of a significant increase in computational complexity (perhaps 3x or more). You can find the technical proposals here.

Just heard that I will receive some advance copies of my new book in a few days. It should be available in the UK very soon; I'll post a note here once I have a confirmed date for US and the rest of the world. Resources

- Iain

Praveen asked the following question:
"I have a question regarding 'SKIP' block coding. When is a block decided to be "SKIPPED". What are the criteria and how is the SKIP macroblock coded?"

A SKIP macroblock is a macroblock (16x16 displayed pixels) for which no information is sent to the decoder - i.e. no coded coefficients, no header and no prediction information. In H.264, an encoder can choose SKIP mode for a macroblock in a P- or B-slice. The decoder estimates a motion vector for the skipped macroblock from neighbouring coded macroblocks and uses this to calculate a motion compensated prediction for the skipped MB. Since there is no residual, the motion compensated prediction is directly inserted into the decoded frame or field.

It's up to the encoder to choose whether to code or skip a MB. Typically the encoder might choose SKIP when the rate-distortion cost of SKIP mode is lower than any coded mode, i.e. when a weighted combination of bitrate and distortion (the quality loss of the decoded MB) is lower. The encoder may also "guess" that SKIP mode is suitable using other criteria such as local scene statistics, in order to save computation.

- Iain

I'll be in the SF Bay / San Jose area from 26th-29th April 2010, visiting the Embedded Systems Conference. Please get in touch if you are interested in meeting me.
- Iain Richardson

I've made the final corrections to the proofs of my new book, "The H.264 Advanced Video Compression Standard". Hopefully it'll appear in May 2010. You can find some more information here. If you have any questions about the new book, please let me know.
- Iain Richardson.

I've put up a page with some information about my new book, H.264 Advanced Video Compression: resources

Apart from chapters 2 and 3 (video quality and video compression concepts), the material has been completely rewritten. Chapters 4-7 cover the H.264 standard in detail and chapters 8-10 cover performance, implementation and extensions. Please get in touch if you have any questions about the book.
- Iain.