The importance of video codecs in terms of image quality and network bandwidth occupation.
HEVC ( High Efficiency Video Coding ), also known as H.265, is a standard for video compression that should be widely known by now. Launched in 2013, HEVC is now the reference point for the leading online streaming platforms such as Netflix, YouTube, Twitch, and similar: it guarantees higher video quality while consuming less space, a behavior that translates into less bandwidth required and less data consumption.
Compared to the predecessor H.264, HEVC allows you to compress twice the data with a birate halved: this implies that, for example, the quality of high definition is maintained while the “space” occupied is reduced by half.
In summary, HEVC offers the following advantages over the H.264 codec:
1) Allows 8K resolution up to 300 fps (H.264 is limited to 4K at 60 fps)
2) The video stream is distributed at half the bitrate while maintaining quality.
3) HEVC videos contain fewer errors and artifacts—the overall image quality benefits from this.
4) HEVC allows you to divide each frame’s pixels into groups of different sizes to optimize the video stream based on every single scene (the technique is called Coding Tree Unit ). The blocks of information are managed in groups of dimensions from 4×4 to 64×64, while H.264 only allows blocks up to 16×16.
5) HEVC improves segmentation algorithms: instead of using only one frame and the next to compare information, it uses others. Information that does not change from one frame to another is reused, obviously saving space and network bandwidth.
6) HEVC optimizes the motion tracking mechanism: even in this case, in images that are not completely static, the standard continues to exploit the information that is part of the previous frames.
Therefore, a video that has been compressed using the HEVC standard will guarantee the same or better quality than another compressed with H.264 while taking up much less space.
The use of the HEVC codec is also at the heart of the transition to DVB T2 – the new digital terrestrial – with the switch off scheduled for mid 2022: DVB T2, what it is and what changes with the new technology.
We briefly talked about the aspects related to the occupation of the client-side network band. Above all to contain costs, to optimize the respective infrastructures as the number of customers grows, the content providers are however trying to further reduce the bandwidth required to distribute high quality multimedia content, unaltered compared to current standards. or even improved.
AV1 was developed by the Alliance for Open Media, “consortium,” which sees Mozilla, Google, Apple, Microsoft, AMD, Cisco, Amazon, Netflix, Facebook, NVidia, and Adobe and Samsung.
Many of the novelties of AV1, released as a royalty-free and opensource codec, derive from VP9, developed by Google (the specifications are illustrated at this address ).
At the beginning of February 2020, Netflix started using the AV1 codec on Android instead of VP9, highlighting how the compression efficiency is improved by 20%, with a consequent reduction in the necessary bandwidth.
On desktop and notebook PCs, browsers such as Google Chrome, Firefox, Edge Chromium, and Opera (in the updated versions) support AV1 ( here a series of YouTube videos that it transcoded to AV1). From this page, it is possible to download the preview version of Windows 10, which introduces support for the AV1 codec at the operating system level.
The well-known media player VLC also supports AV1 by default.
A tech-savvy writer with a knack for finding the latest technology in the market, this is what describes John Carter. With more than 8 years of experience as a journalist, John graduated as an engineer and ventured soon into the world of online journalism. His interest includes gadget reviews, decoding OS errors, hunting information on the latest technology, and so on.
Umuhimu wa video codecs katika suala la ubora wa picha na mtandao bandwidth kazi. HEVC (High Efficiency Video Coding) ni kiwango cha video compression ambacho kinajulikana sana. Ilianzishwa mnamo 2013, HEVC sasa ni alama ya kumbukumbu kwa majukwaa ya kuongoza ya mkondo wa mtandaoni kama vile Netflix, YouTube, Twitch, na mengineyo: inahakikisha ubora wa video ya juu wakati wa kutumia nafasi kidogo, tabia ambayo inatafsiri katika upana wa bendi mdogo unaohitajika na matumizi ya data. Ikilinganishwa na mtangulizi wake H.264, HEVC inaruhusu compress mara mbili ya data na birate nusu: hii ina maana kwamba, kwa mfano, ubora wa ufafanuzi wa juu ni kudumishwa wakati nafasi occupied ni kupunguzwa kwa nusu. Kwa muhtasari, HEVC inatoa faida zifuatazo juu ya H.264 codec: 1) inaruhusu azimio la 8K hadi 300 fps (H.264 imepunguzwa kwa 4K kwa 60 fps) 2) Mtiririko wa video umesambazwa kwa nusu ya bitrate wakati wa kudumisha ubora. 3) Video HEVC zina makosa machache na artifacts <unk> ubora wa jumla wa picha faida kutoka hii. HEVC ni mbinu ya kugawa pixel ya kila sura katika makundi ya ukubwa tofauti ili kuboresha mkondo wa video kulingana na kila eneo moja (mbinu hiyo inaitwa Coding Tree Unit). H.264 ina uwezo wa kuunganisha vipande vya habari kutoka 4x4 hadi 64x64 kwa ukubwa wa kawaida, na H.264 ina uwezo wa kuunganisha vipande vya habari kutoka 4x4 hadi 64x64. "Hii ni kwa sababu ""Hivc"" ni njia ya kuunganisha algorithms ya kugawanya, ambayo inasaidia kuunganisha data kutoka kwa moja hadi nyingine, na sio tu kwa kutumia frame moja na nyingine, lakini pia kwa kutumia algorithms nyingine." Habari ambayo haibadiliki kutoka sura moja hadi nyingine hutumiwa tena, wazi kuokoa nafasi na upana wa mtandao. HEVC ni mfumo wa kufuatilia mwendo wa picha, ambayo inasaidia kuunda picha za hali ya juu na kuendeleza picha za hali ya juu. Kwa hivyo, video ambayo imefunikwa kwa kutumia kiwango cha HEVC itahakikisha ubora sawa au bora kuliko nyingine iliyofunikwa na H.264 wakati inachukua nafasi kidogo. "Kutumia codec ya HEVC pia ni kiini cha mabadiliko ya DVB-T2 - digital mpya ya ardhi - na kugeuka kwa mpango wa katikati ya 2022: ""DVB-T2 - ni nini na nini inabadilika na teknolojia mpya.""" Sisi kwa ufupi alizungumza juu ya masuala yanayohusiana na kazi ya upande wa mteja mtandao bendi. Zaidi ya yote, ili kudhibiti gharama, kuboresha miundombinu husika, idadi ya wateja inakua, watoaji wa maudhui wanajaribu kupunguza zaidi upana wa bendi inayohitajika kusambaza maudhui ya multimedia ya ubora wa juu, bila kubadilishwa ikilinganishwa na viwango vya sasa. au hata kuboreshwa. "Mkutano huo unaitwa ""Alliance for Open Media"" na unajumuisha makampuni kama vile Mozilla, Google, Apple, Microsoft, AMD, Cisco, Amazon, Netflix, Facebook, Nvidia, Adobe, Samsung na Vimeo." Vifaa vya AV1 vimeundwa na Google, na vimeundwa na VP9 (maelezo ya vipimo ni hapa). Netflix ilizindua codec ya AV1 kwenye Android mnamo Februari 2020, na kuongeza ufanisi wa compression kwa 20%, na kupunguza bandwidth muhimu. Kwa upande wa desktop na laptop, browser kama vile Google Chrome, Firefox, Edge Chrome, na Opera (katika matoleo yaliyosasishwa) inasaidia AV1 (hapa mfululizo wa video za YouTube ambazo zimebadilishwa kuwa AV1). "Kutoka ukurasa huu, ni uwezekano wa kupakua toleo la preview ya Windows 10, ambayo inatoa msaada kwa ajili ya AV1 codec katika ngazi ya mfumo wa uendeshaji.""" VLC ni maarufu sana kwa ajili ya kucheza vyombo vya habari, lakini pia inasaidia AV1 kwa default. "Mwandishi wa teknolojia na mwandishi wa habari, John Carter, anaelezea ""Uhitaji wa teknolojia ya kisasa katika soko.""" Baada ya miaka 8 ya uzoefu kama mwandishi wa habari, John alihitimu kama mhandisi na haraka akaingia katika ulimwengu wa uandishi wa habari mtandaoni. Maslahi yake ni pamoja na gadget mapitio, decoding OS makosa, uwindaji habari juu ya teknolojia ya karibuni, na kadhalika.