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    #4 Concept Series : What is the difference between HEVC (H.265) and H.264 (MPEG-4 AVC)

    Posted In Future of Media, Media Concepts - By Nitin Narang on Tuesday, October 1st, 2013 With 8 Comments

    H.265 is the successor standard to H.264, aka MPEG-4 AVC and has generated huge optimism given Industry’s struggle with shortage of bandwidth, spectrum, storage and imminent need to take growing HD content for multi platform delivery. HEVC was approved by ITU-T in Jan 2013 and has been among the most discussed broadcast trends, as well as the key technology offering at NAB and IBC with product vendors and service providers flooding HEVC solutions to bring alive the cherished 4K experience.

    HEVC vs H.264HEVC is Big Deal …Today H.264 is the most widely accepted and adopted format in online and broadcast domain for content compression and distribution. HEVC (High Efficiency Video Coding),  the new video coding standard brings promise of huge bandwidth savings of approx. 40-45% over H.264 encoded content (ref. HEVC MP and H.264 HP with similar fps) with similar quality. In addition HEVC has potential to significantly impact other areas including

    • Accelerate demand and sale of 4K screens which has been largely limited due to large price difference and absence of UHD content. HEVC can offset the second challenge
    • Huge opportunities from reduced bitrate requirements enabling broadcasters and OTT vendors to bundle more channels / content on existing delivery mediums
    • Extend far greater video quality experience compared to H.264 encoded sequence at same bitrate
    • Ability to offer higher quality video for bandwidth constrained mobile networks
    • Realize differentiated and premium 4K content, multiview encoding etc..

    …But HEVC Adoption is still Far.  While HEVC can bring respite to content producers, aggregators, distributors and consumers with more quality content at same bitrate, the adoption curve could still be years away. Few reasons being

    1. Industry adoption weighs heavily on investments and with significant cost gone in H.264 gear for SD to HD migration, next expensive transition will take time. End to end deployment will require headend upgrade, workflow overhaul, re-deployment of media players (STBs, game consoles ..) with embedded HEVC hardware decoders and migration of huge content libraries from H.264 to HEVC.
    2. In addition to CE player, support from major technology players (Google, Adobe, Apple, Microsoft, Sony etc.) in their players, browsers,  mobile and PC operating systems will determine majority adoption.
    3. Time to realize power efficient and real time encoders/decoders given HEVC computational overheads. Availability of affordable HEVC technology in silicon with level of reliability will be the defining milestone

    What differentiates HEVC from its Predecessor 

    Some of the key differences between H.265 (HEVC) and H.264 (MPEG 4 AVC) are listed below

    Category
    H.264
    H.265
    NamesMPEG 4 Part 10 AVC (Introduced in 2004)
    MPEG-H, HEVC, Part 2 (Approved in Jan 2013 )
    Industry adoption
    Dominant and accepted video codec for Terrestrial, Cable, Satellite and IPTV broadcast. (ATSC/DVB/ISDB)
    Widely used across Blu-Ray, security systems, videoconferencing , mobile video, media players, video chat etc.
    Implementation demonstration across NAB, IBC and other events starting 2012 from companies e.g. ATEME, Broadcom, Thomson , Harmonic (Cisco), Ericsson, Qualcomm etc.. Increased R&D across Encoder/Decoder /CE vendors for software and hardware based solutions
    Key Improvement
    - 40-50% bit rate reduction compared to MPEG-2
    - Led the growth of HD content delivery for Broadcast and Online
    - 40-50% the bit rate reduction at the same visual quality compared to H.264
    - Potential to realize UHD, 2K, 4K for Broadcast and Online (OTT)
    Progression Successor to MPEG-2 Part
    Successor to MPEG 4 AVC, H.264
    Compression Model
    Hybrid spatial-temporal prediction model
    - Flexible partition of Macro Block (MB) , sub MB for motion estimation
    - Intra Prediction (extrapolate already decoded neighboring pixels for prediction)
    - Introduced multi-view extension
    9 directional modes for intra prediction
    - Macro Blocks structure with maximum size of 16x16
    - Entropy coding is CABAC and CAVLC
    Enhanced Hybrid spatial-temporal prediction model
    - Flexible partitioning, introduces Coding Tree Units (Coding, Prediction and Transform Units -CU, PU, TU)
    - 35 directional modes for intra prediction
    - Superior parallel processing architecture, enhancements in multi-view coding extension
    - CTU supporting larger block structure (64x64) with more variable sub partition structures
    - Entropy coding is only CABAC
    Specification
    Support Up to 4K (4,096×2,304)
    Supports up to 59.94 fps
    21 profiles ; 17 levels
    Up to 8K UHDTV (8192×4320)
    Supports up to 300 fps
    3 approved profiles, draft for additional 5 ; 13 levels
    Drawbacks
    Unrealistic for UHD content delivery due to high bit rate requirements. Frame rate support restricted to 59.94Computationally expensive  (~ 300 % + ) due to larger prediction units and expensive Motion Estimation (Intra prediction with more nodes, asymmetric partitions in Inter Prediction).

    Download Comparison between HEVC and H.264

    There is general euphoria and high expectations from HEVC, but historically it takes somewhere between 6-10 years before a standard become mainstream.  Some stimulating questions attributing to HEVC roadmap will include

    What is your perspective

    What is your perspective

    1. Larger screen resolution will requires higher frame rates 60- 120 fps from current 24-30 fps,  given the increase in fps, what overall efficiency savings could HEVC realistically achieve?
    2. Given state of bandwidth networks, growth in video coupled with multi screen delivery and absence of UHD content, will encoding existing SD/HD content with bitrate efficiency become more likely business case for HEVC rather than 4K?
    3. How far is HEVC adoption from broadcast industry standard specifications  (DVB/ATSC) given footprint of legacy equipment and transmission infrastructure?
    4. What are the sector specific services which could lead the transition and embrace HEVC sooner that rest of the pack – mobile video services, OTT players? Similarly role of international events like 2014 FIFA world cup and Rio 2016 Olympics towards selective adoption?

    We are bound to witness more product and service roll-outs with HEVC-related technologies and announcements from early adopters who will define the expectations for mainstream Industry.  HEVC has relevance and impact across wide ranging applications in Broadcast (Cable, Satellite, IPTV), Digital Cinema, Internet streaming, content production, storage, Mobile streaming, medical imaging, video conferencing among others, but how early will the industry endorse and adopt is yet to be seen.

    What is your perspective – please share your feedback, suggestions and comments!

    About - Digital Media Technology Consultant. I have passion for TV technology, digital convergence and changing face of Media and Entertainment industry.

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    • Heather

      “Difference between HEVC (H.265) and H.264 (MPEG-4 AVC), future of HEVC” actually makes me imagine a tiny bit further.
      I personally appreciated each and every single portion of it.
      Thank you -Delila

    • Thao

      Great post. I will be facing some of these issues as well..

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    • brainburst

      40-45% over H.264. Think about this for a moment folks. UHD is 4 x the data of HD that’s 400% more data. saving 40-45% of something that is 400% bigger means that 4k ain’t really going to happen, UHD will require minimum 220% more bandwidth even assuming increased compression efficiency. Oh sure it will be formatted as 4k, but the resolution WILL NOT BE THERE!

      • http://www.mediaentertainmentinfo.com Nitin Narang

        The figure 40-45% over H.264 represents bandwidth savings over H.264 for the same quality. So given that today large potion of online video is H.264, there is a substantial saving potential in having content encoded/recoded with HEVC due it its increased compression efficiency. Yes, UXD is going to be heavy and even with increased compression efficiency will take much larger bandwidth, 15 mbps is the most optimistic number industry is putting forward for acceptable experience .
        Although it is another topic as how much content will be available in 4K, added cost of delivery (infrastructure setup, processing, cost of hardware etc.) and finally how many users actually have 4k enabled devices today… It is a slow change, may take several years but it is coming.

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