Clear restore the scene 31 years ago, volcanic engine ultra clear repair beyond classic concert

7 month 3 Friday night , Tiktok joined hands with universal music's brand Polaroid , The live broadcast was repaired by volcanic engine ultra clear Beyond Live1991 Selected content of life contact concert and memorial concert , Attracted over 1.4 Million people watched .

Beyond It is a group founded in 1983 Rock band in , With the rise of Cantonese music ,Beyond The name of the band has become a cultural mark of the times .“Beyond Live1991 Life contact ” yes Beyond The first concert held in Hung Hom stadium , Polaroid later released a DVD in 90 Time is almost hard to find . After that 31 Mid year , This concert has become the music enlightenment and youth memory of generations of fans .

Limited by the shooting equipment at that time 、 Storage media and recording equipment technology , The audio and video quality of the concert master tape and various versions circulated on the Internet is poor . In order to improve the experience of watching and listening , playback Beyond This classic , The volcanic engine has been repaired in terms of image quality and sound quality .

Introduction to volcanic engine Multimedia Laboratory , The early software and hardware equipment were backward , As a result, the film is being made 、 Compress 、 There is blurring in the transmission process 、 Problems such as texture loss and noise artifacts . Improve the image quality while restoring as many details as possible , Optimize colors and retain a retro feel , And adjust different sizes 、 Restoration effect of posture portrait , This is the difficulty of this repair .

“ Our goal is to improve the overall clarity of the picture 、 The restoration of facial features 、 Color brightness 、 Fluency 、 Improve the image quality in terms of aesthetics .” The quality of the picture , This repair is through sharpness enhancement and defect repair 、 Algorithms such as subregional color brightness enhancement , Deal with the problems caused by the backwardness of early software and hardware equipment . Video resolution is never enough 540p To be close to 4K level , Frame rate from 25fps Upgrade to 60fps.

Repair through portrait enhancement algorithm , Eyeliner on Huang Jiaju's face 、 Details such as pores are clearly visible

Besides , The volcano engine multimedia laboratory also developed an adaptive portrait enhancement algorithm , For face compression damage 、 Fuzzy 、 Low resolution and other problems , Repair and enhance . This technology is based on deep learning , While eliminating the blur and compression damage of the whole face , Further reconstruct the details of the key facial features . After repair , The beard of the character's face 、 Pores are clearly visible , Bring better visual experience to the audience .

In terms of sound quality restoration , Volcanic engine audio technology team reduces noise through audio 、 Audio super division and loudness Algorithm , Eliminate noise and improve sound quality , Solve loudness 、 Noise interference 、 Insufficient bandwidth and other problems .

Different from the traditional noise reduction scheme , This noise reduction algorithm is aimed at music scenes and vocal scenes , Compatible AI Noise reduction algorithm , On the premise of preserving music and human voice , Suppress surrounding noise . Audio super division algorithm expands the frequency band of the vocal part in the concert , Rich high-frequency information , Make the voice clearer . You can see from the spectrum diagram , Through the processing of super sub module , The high-frequency part of the original audio has been expanded and enhanced .

Through the processing of audio super division algorithm , The original audio is greater than 12kHz The high-frequency information of has been completed and repaired to a certain extent

Due to the different pickup conditions in the concert , Sometimes the sound of singing in the concert is too small compared with the sound of musical instruments and ambient sound , The volcanic engine audio technology team first extracts the singing part separately by using the loudness Algorithm , Then adjust the loudness of the singing part , Finally Remix , Make the overall voice more comfortable .

according to the understanding of , These restoration capabilities of the concert have been intelligently processed by the volcanic engine 、 Audio technology products provide external services . in addition , Volcano engine has also opened up end-to-end solutions for the whole image quality chain , Overlay upload 、 transcoding 、 transmission 、 Consumption and other links , Realize video content in picture quality 、 Bit rate 、 Experience and other aspects of all-round optimization .

Digital technology is becoming a driving force for cultural heritage . Relevant reports show that ,2021 year 10 month , Watermelon video and volcano engine launch “ Classic video 4K Repair plan ”, By technical means , Cumulative repair completed 71 A classic cartoon , The repaired content can be found in watermelon video 、 Fresh time TV free .

The person in charge of volcanic engine introduced , In the future, more advanced technologies will be used to repair classic images , Let the classic shine .