Video: Per-title Encoding at Scale

MUX is a very pro-active company pushing forward streaming technology. At NAB 2019 they have announced Audience Adaptive Encoding which is offers encodes tailored to both your content but also the typical bitrate of your viewing demographic. Underpinning this technology is machine learning and their Per-title encoding technology which was released last year.

This talk with Nick Chadwick looks at what per-title encoding is, how you can work out which resolutions and bitrates to encode at and how to deliver this as a useful product.

Nick takes some time to explain MUX’s ‘convex hulls’ which give a shape to the content’s performance at different bitrates and helps visualise the optimum encoding parameters the content. Moreover we see that using this technique, we see some surprising circumstances when it makes sense to start at high resolutions, even for low bitrates.

Looking then at how to actually work out on a title-by-title basis, Nick explains the pros and cons of the different approaches going on to explain how MUX used machine learning to generate the model they created to make this work.

Finishing off with an extensive Q&A, this talk is a great overview on how to pick great encoding parameters, manually or otherwise.

Watch now!

Speaker

Nick Chadwick Nick Chadwick
Software Engineer,
Mux Inc.

Video: VMAF – the Journey Continues

VMAF is a video quality metric created by Netflix which allows computers to indicate what quality a video is. This is an important part of evaluating how good your encoder or streaming service is so it’s no surprise that Netflix has invested years of research into this. Other metrics such as PSNR and MS-SSIM all have their problems – and let’s accept that no metric is perfect – but what the industry has long grappled with is that a video that has a strong fidelity to the source doesn’t necessarily look better than one that less-faithfully replicates the source.

Imagine you had a video of an overcast day and one encoder rendered the video a bit brighter and a bit more blue. Well, for that clip, people watching might prefer that encoder even though the video is quite different from the source. The same is true of noisy pictures where replicating the noise isn’t always the best idea as some people, for some content, would prefer the cleaner look even though some details may have been lost.

As such, metrics have evolved from PSNR which is much more about fidelity to metrics which try harder to model what ‘looks good’ and VMAF is an example of that.

Zhi Li explains the history of VMAF and explains some of the new features which were released in August 2018, when this talk was given, which gives an insight into the way VMAF works. Plus, there’s a look ahead at new features on the road map. This talk was given at a SF Video Technology meet up.

Watch now!

Speakers

Zhi Li Zhi Li
Senior Software Engineer – Video Algorithms and Research
Netflix

Video: AV1 vs. HEVC: Perceptual Evaluation of Video Encoders

Zhou Wang explains how to compare HEVC & AVC with AV1 and shares his findings. Using various metrics such as VMAF, PSNR and SSIMPlus he explores the affects of resolution on bitrate savings and then turns his gaze to computation complexity.

This talk was given at the Mile High Video conference in Denver CO, 2018.

Speakers

Zhou Wang Zhou Wang
Chief Science Officer,
SSIMWAVE Inc.

Video: Video-Evaluation Best Practices: Testing & Optimisation Techniques

In this webcast, AWS Elemental dives into a topic other companies don’t discuss: The video encoding techniques some vendors use to sway judgment during proof-of-concept demos.

Improve your discerning eye and your analysis acumen, and obtain essential knowledge:

  • Methods and best practices for evaluating video quality
  • Examples of scenes which look totally different, but have the same metrics score
  • Important considerations for accurate evaluation of video results
  • Subjective vs. Objective results
  • How encoder settings affect output and how you can fine tune them for the best results
  • What is Adaptive Quantization and how can it improve your video output quality
  • Encoding techniques that impress in shootouts but might not be practical in production

Video encoding comparisons should inform, not fool. Learn what you need to know, before you start the process.

Speakers:

Dan Gehred Dan Gehred
Solutions Marketing Manager for Compression, AWS ElementalDan Gehred, Solutions Marketing Manager for Compression at AWS Elemental, is responsible for product marketing for all compression software products. Dan has over 15 years of experience building and marketing digital media applications.
Dan Germain Dan Germain
Sr. Product Manager Compression – VOD, AWS ElementalWith over 30 years of industry experience in the international media marketplace, Dan is passionate about technology, developing new standards, promoting positive change and business approaches to enhanced profitability.

Video: Streaming at 250 kbps – raise your expectations


Megha Manohara discusses Netflix’s ongoing efforts to reduce the bitrate of movies whilst maintaining their enjoyability showing their success right down to 250kbps.

As a Senior Software Engineering on Video Algorithms, Megha’s talk focuses on the research and implementation challenges of Dynamic optimizer – an innovative shot-based encoding tool that raises the perceptual quality of streams at bitrates as low as 250kbps. Visiting VMAF, PSNR and other metrics on the way, this talk gives great ideas on reducing bitrate and measuring success.

See also, her article on per-shot encoding.

Watch now!