Netflix’s Anne Aaron explains how VMAF came about and how AV1 is going to benefit both the business and the viewers.
VMAF is a method for computers to calculate the quality of a video in a way which would match a human’s opinion. Standing for Video Multi-Method Assessment Fusion, Anne explains that it’s a combination (fusion) of more than one metric each harnessing different aspects. She presents data showing the increased correlation between VMAF and real-life tests.
Anne’s job is to maximise enjoyment of content through efficient use of bandwidth. She explains there are many places with wireless data is limited so getting the maximum amount of video through that bandwidth cap is an essential part of Netflix’s business health.
This ties in with why Netflix is part of the Alliance for Open Media who are in the process of specifying AV1, the new video codec which promises bitrate improvements over-and-above HEVC. Anne expands on this and presents the aim to deliver 32 hours of video using AV1 for 4Gb subscribers.
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.
Streaming Media East brings together Beamr, Netflix BAMTECH Media and SSIMWAVE to discuss the best ways to evaluate software encoders and we see there is much overlap with hardware encoder evaluation, too.
The panel gets into detail covering:
Choosing source sequences
Rate Control Modes
Bit Rate or Quality Target Levls
Offline (VOD) vs Live (Linear)
Discrete vs. Multi-resolution/Bitrate
Subjective vs. objective measurements
Encoding Efficiency vs Performance
Video vs Still frames
Evaluation at Encode Resolution Vs Display Resolution
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.
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.
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.