Optimising encoding by per-title encoding is very common nowadays, though per-scene is slowly pushing it aside. But with so many companies offering per-title encoding, how do we determine which way to turn?
Jan Ozer experimented with them, so we didn’t have to. Jan starts by explaining the principles of per-title encoding and giving an overview of the market. He then explains some of the ways in which it works including the importance of changing resolution as much as changing
As well as discussing the results, with Bitmovin being the winner, Jan explains ‘Capped CRF’ – how it works, how it differs from CBR & VBR and why it’s good.
Finally, we are left with some questions to ask when searching for our own per-title technology to solve the problem we have such as “can it adjust rung resolutions?”, “Can you apply traditional data rate controls?” amongst others.
Adaptive bitrate, ABR, is vital in effective delivery of video to the home where bandwidth varies over time. It requires creating several different renditions of your content at various bitrates, resolutions and even frame rate. These multiple encodes put a computational burden on the transcode stage.
Lowell Winger explains ways of optimising ABR encodes to reduce the computation needed to create these different versions. He explains ways to use encoding decisions from one version and use them in other encodes. This has a benefit of being able to use decisions made on high-resolution versions – which are benefiting from high definition to inform the decision in detail – on low-resolution content where the decision would otherwise be made with a lot less information.
This talk is the type of deep dive into encoding techniques that you would expect from the Video Engineering Summit which happens at Streaming Media East.
Ed Silvester heads up video R&D at Perform Group, since rebranded to DAZN (pronounced ‘dah zone’) so he’s just the man to talk us through the business aspects of encoding. Anchoring the conversation in the times that black and white TV changed to colour, Ed looks at the challenges DAZN have in creating an innovative platform with backwards compatability.
Ed considers whether the industry should DIET, shedding some older technologies (watch the talk to find out what DIET stands for). And raises some questions about how the industry should deal with platforms ending, scaling and compatibility.
In this video from Streaming Media East 2018, Jan Ozer looks at per-title encoding. Jan presents detailed results from tests of competing methods to help us understand the dos and don’ts of encoding and VQ and how these methods allow higher resolution profiles in ABR ladders.
What is ‘per-title’ encoding and why is it important?
What are the different methods? (CRF, SABL, Context Aware, EuclidIQ Rithm)