For example, the visual appeal of the live broadcast of NBA Finals can be seen like this?

stay 6 month 16 At the end of the day NBA In the finals , The warriors 4-2 Beat the celtics , Win the championship ！ This year's NBA The finals attracted a lot of attention , The live broadcast atmosphere of events on major Internet platforms is also very warm .

How can the platform not only display professional event interpretation , It can also interact with fans and spectators in depth ？ How can the platform not only display professional event interpretation , It can also interact with fans and spectators in depth ？

Baishi TV During this finals , As the only one in the whole network “ The host will watch it with you NBA” Mode live broadcast platform , Compared with the traditional live event commentary , Baishi TV Our anchors use “ Nagging ” In a way that allows fans to participate , Bring... To the fans “ Zero time difference 、 Super immersive ” Interactive viewing experience .

take “ Accompanying type ” The commentary of the event is 100 vision TV In the face of content differentiation competition , In order to bring a better viewing experience , Baishi TV Join hands with Alibaba cloud video cloud to create a further experience improvement in the quality of live game pictures .

Narrowband HD 2.0： Breaking the image quality pain point of the live broadcast of the event

The live broadcast of the event is facing pain points .

Compared with Pan entertainment and e-commerce scenes, the live broadcast of basketball matches , Because the screen switching is fast 、 Very sporty , High bit rate streams are often required . However , High bit rate live broadcasting may be affected by network quality fluctuations in cross-border transmission , Cause audio and video jam and delay . In order to ensure the stability of the live broadcast and the silk skating viewing experience based on the playback end , Baishi TV The source stream with smaller bit rate is selected .

However , Compared with the picture quality of high bit rate stream , Low bit rate streams will have obvious compression distortion 、 Blurred details and weak textures are lost . For basketball game scenes , It will cause the words on the planet's clothing to be blurred 、 The net is blurry 、 There are many image quality phenomena such as too many burrs on the boundary lines and text edges on the ground , Resulting in poor viewing experience .

To better balance the smoothness of live broadcast 、 Stability and HD quality experience , Baishi TV stay NBA In the final broadcast process, a relatively low bit rate is selected to achieve stable cross-border transmission , Pull the source stream to China and then repair it , In the process , Baishi TV We used Alibaba cloud video cloud “ Narrowband HD 2.0” technology .

Here's the picture , adopt “ Narrowband HD 2.0” Adaptive brightness of technology 、 Contrast and color enhancement algorithms , Intelligently enhance the intensity of softer and darker colors in the game picture , Enhance the overall picture color expressiveness for low bit rate source video , Improve the feeling of watching the game .

Alibaba cloud video cloud “ Narrowband HD 2.0” introduce AI Go into the details 、 Color adaptive restoration and enhancement , Starting from the human visual model , The optimization goal of the encoder is changed from the classic “ The highest fidelity ” Adjusted for “ The subjective experience is the best ”.

• Downscaling

Due to the brightness of the video spatial domain perceived by the human eye 、 Contrast and time-domain distortion are discontinuous , The visual redundancy information is discarded by adaptive coding technology , It can greatly save bit rate without significant reduction of subjective quality , namely , Use “ Narrowband HD ” Transcoding compared to ordinary transcoding , At least 20%-40% Left and right bit rates .

• hd

meanwhile , Through the video compression distortion degree automatic detection algorithm , And the subjective experience Optimization of the encoder , Enhance the details that the human eye pays attention to 、 Focus area 、 Regular texture , Through adaptive brightness 、 Contrast and color enhancement algorithms , Make the whole picture more vivid and natural . According to Baishi TV Description of relevant technicians , After using narrowband HD technology , On a dual screen display “ Source video ” And “ Video after repair ” The contrast effect is very obvious .

• Customized templates for basketball games

Besides , Alibaba cloud video cloud algorithm team aims at basketball match scenarios , Designed for Baishi TV Customized the transcoding template and AI Fix the model , And aim at NBA The competition scene has been specially optimized , Enhanced basketball court floor texture 、 Close up of players 、 Court boundary line 、 Ground advertising letters 、 The numbers on the shirt 、 The repair and generation of basketball nets and other unique elements of basketball sports events . Here's the picture , Even when the camera moves at a high speed and the screen switches , And the details of the picture are highly enlarged ,“ Narrowband HD ” Technology can still bring the boundary line of the court 、 The details of the ground advertising letters are perfectly restored , Greatly improve the picture definition and overall visual performance .

The evolution of radio and television level live broadcasting capability

Alibaba cloud video cloud “ Narrowband HD ” The concept dates back to 2015 in , It has been practiced repeatedly in many Internet and media industries for many years , The technology is continuously developing and evolving , In order to match different scenes for low bit rate and high-definition experience .

Especially today's narrowband HD 2.0, As an important technology of Alibaba cloud's live entertainment solution , Breaking the capacity limit of contemporary video coders , Upgrade and iterate the technology , Deeply optimize the smoothness and high definition of video playback , Achieve more flow saving under the same image quality 、 More high-definition commercial value and viewing sense under the same bandwidth , Meet both the enterprise and the audience .

meanwhile , Narrowband HD 2.0 It is more oriented to different industries 、 Transcoding scheme of the scene , Such as sports events 、 The concert 、 Cultural performances and other scenes , It also supports providing cinema level audio-visual enjoyment in combination with Dolby sound effects , It brings great fluency to the live broadcast of large-scale cultural activities and sports events 、 Full vision 、 Deeply immersive viewing experience .

Alibaba cloud's live entertainment solution

On top of the core , Alibaba cloud's systematic live streaming solution is more comprehensive and powerful . among , The global 2800+ Nodes and 150TB Bandwidth reserve , And based on the global real-time streaming media transmission network （GRTN）, It can guarantee the high-quality viewing experience delivered by tens of millions of users ; Full link disaster recovery and emergency plan , And years of live broadcast best practices , It can ensure the high reliability of large-scale live broadcasting ; Cloud guide and interactive virtual studio technology , Bring cloud efficiency integrating production and broadcasting and a new live experience of real-time immersive interaction ; meanwhile , stay “ Narrowband HD ” Transcoding technology , Plus Ultra HD 4K/8K、 Dolby sound 、50 Frame and other audio and video capabilities , The whole brings the ultimate audio-visual .

Everything is perfect 、 Intelligent 、 High quality and high experience .

Based on this ability , Alibaba cloud's sports live broadcast solution has realized the live broadcast verification of a large number of top-level events and major activities .

2018 World Cup events , It ensures the stable and smooth viewing of tens of millions of level concurrency ;2020 The opening ceremony of the China Pavilion of the Dubai WorldExpo , Achieve 0 Frame loss 、0 Caton's webcast ;2022 Beijing Winter Olympic Games , Help the Centennial Olympic Games launch interactive virtual studio for the first time , Create real-time immersive reports ; meanwhile , Every year, it is also for tmall 11 The party provides an end-to-end live broadcast solution , Continuously ensure the stability of the live stream in high specification scenarios ……

Numerous experiences and innovations , Alibaba cloud's broadcasting, television, sports and live broadcasting solution , It has accumulated profound technical depth and practical experience , It also allows the global audience to enjoy the first scene of high quality for the first time .

Everything is different because of technology , Look forward to more technical changes and experience upgrades under the exciting events .

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