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Text of the page (random words):
f applications these are declared using a profile code profile_idc and sometimes a set of additional constraints applied in the encoder the profile code and indicated constraints allow a decoder to recognize the requirements for decoding that specific bitstream and in many system environments only one or two profiles are allowed to be used so decoders in those environments do not need to be concerned with recognizing the less commonly used profiles by far the most commonly used profile is the high profile profiles for non scalable 2d video applications include the following constrained baseline profile cbp 66 with constraint set 1 primarily for low cost applications this profile is most typically used in videoconferencing and mobile applications it corresponds to the subset of features that are in common between the baseline main and high profiles baseline profile bp 66 primarily for low cost applications that require additional data loss robustness this profile is used in some videoconferencing and mobile applications this profile includes all features that are supported in the constrained baseline profile plus three additional features that can be used for loss robustness or for other purposes such as low delay multi point video stream compositing the importance of this profile has faded somewhat since the definition of the constrained baseline profile in 2009 all constrained baseline profile bitstreams are also considered to be baseline profile bitstreams as these two profiles share the same profile identifier code value extended profile xp 88 intended as the streaming video profile this profile has relatively high compression capability and some extra tricks for robustness to data losses and server stream switching main profile mp 77 this profile is used for standard definition digital tv broadcasts that use the mpeg 4 format as defined in the dvb standard 30 it is not however used for high definition television broadcasts as the importance of this profile faded when the high profile was developed in 2004 for that application high profile hip 100 the primary profile for broadcast and disc storage applications particularly for high definition television applications for example this is the profile adopted by the blu ray disc storage format and the dvb hdtv broadcast service progressive high profile phip 100 with constraint set 4 similar to the high profile but without support of field coding features constrained high profile 100 with constraint set 4 and 5 similar to the progressive high profile but without support of b bi predictive slices high 10 profile hi10p 110 going beyond typical mainstream consumer product capabilities this profile builds on top of the high profile adding support for up to 10 bits per sample of decoded picture precision high 4 2 2 profile hi422p 122 primarily targeting professional applications that use interlaced video this profile builds on top of the high 10 profile adding support for the 4 2 2 chroma sampling format while using up to 10 bits per sample of decoded picture precision high 4 4 4 predictive profile hi444pp 244 this profile builds on top of the high 4 2 2 profile supporting up to 4 4 4 chroma sampling up to 14 bits per sample and additionally supporting efficient lossless region coding and the coding of each picture as three separate color planes for camcorders editing and professional applications the standard contains four additional intra frame only profiles which are defined as simple subsets of other corresponding profiles these are mostly for professional e g camera and editing system applications high 10 intra profile 110 with constraint set 3 the high 10 profile constrained to all intra use high 4 2 2 intra profile 122 with constraint set 3 the high 4 2 2 profile constrained to all intra use high 4 4 4 intra profile 244 with constraint set 3 the high 4 4 4 predictive profile constrained to all intra use cavlc 4 4 4 intra profile 44 the high 4 4 4 predictive profile constrained to all intra use and to cavlc entropy coding i e not supporting cabac as a result of the scalable video coding svc extension the standard contains five additional scalable profiles which are defined as a combination of a h 264 avc profile for the base layer identified by the second word in the scalable profile name and tools that achieve the scalable extension scalable baseline profile 83 primarily targeting video conferencing mobile and surveillance applications this profile builds on top of the constrained baseline profile to which the base layer a subset of the bitstream must conform for the scalability tools a subset of the available tools is enabled scalable constrained baseline profile 83 with constraint set 5 a subset of the scalable baseline profile intended primarily for real time communication applications scalable high profile 86 primarily targeting broadcast and streaming applications this profile builds on top of the h 264 avc high profile to which the base layer must conform scalable constrained high profile 86 with constraint set 5 a subset of the scalable high profile intended primarily for real time communication applications scalable high intra profile 86 with constraint set 3 primarily targeting production applications this profile is the scalable high profile constrained to all intra use as a result of the multiview video coding mvc extension the standard contains two multiview profiles stereo high profile 128 this profile targets two view stereoscopic 3d video and combines the tools of the high profile with the inter view prediction capabilities of the mvc extension multiview high profile 118 this profile supports two or more views using both inter picture temporal and mvc inter view prediction but does not support field pictures and macroblock adaptive frame field coding the multi resolution frame compatible mfc extension added two more profiles mfc high profile 134 a profile for stereoscopic coding with two layer resolution enhancement mfc depth high profile 135 the 3d avc extension added two more profiles multiview depth high profile 138 this profile supports joint coding of depth map and video texture information for improved compression of 3d video content enhanced multiview depth high profile 139 an enhanced profile for combined multiview coding with depth information feature support in particular profiles edit feature cbp bp xp mp prohip hip hi10p hi422p hi444pp i and p slices yes yes yes yes yes yes yes yes yes bit depth per sample 8 8 8 8 8 8 8 to 10 8 to 10 8 to 14 chroma formats 4 2 0 4 2 0 4 2 0 4 2 0 4 2 0 4 2 0 4 2 0 4 2 0 4 2 2 4 2 0 4 2 2 4 4 4 flexible macroblock ordering fmo no yes yes no no no no no no arbitrary slice ordering aso no yes yes no no no no no no redundant slices rs no yes yes no no no no no no data partitioning no no yes no no no no no no si and sp slices no no yes no no no no no no interlaced coding picaff mbaff no no yes yes no yes yes yes yes b slices no no yes yes yes yes yes yes yes multiple reference frames yes yes yes yes yes yes yes yes yes in loop deblocking filter yes yes yes yes yes yes yes yes yes cavlc entropy coding yes yes yes yes yes yes yes yes yes cabac entropy coding no no no yes yes yes yes yes yes 4 0 0 greyscale no no no no yes yes yes yes yes 8 8 vs 4 4 transform adaptivity no no no no yes yes yes yes yes quantization scaling matrices no no no no yes yes yes yes yes separate c b and c r qp control no no no no yes yes yes yes yes separate color plane coding no no no no no no no no yes predictive lossless coding no no no no no no no no yes levels edit as the term is used in the standard a level is a specified set of constraints that indicate a degree of required decoder performance for a profile for example a level of support within a profile specifies the maximum picture resolution frame rate and bit rate that a decoder may use a decoder that conforms to a given level must be able to decode all bitstreams encoded for that level and all lower levels levels with maximum property values 31 level maximum decoding speed macroblocks s maximum frame size macroblocks maximum video bit rate for video coding layer vcl constrained baseline baseline extended and main profiles kbits s examples for high resolution highest frame rate maximum stored frames toggle additional details 1 1 485 99 64 128 96 30 9 8 176 144 15 0 4 1b 1 485 99 128 128 96 30 9 8 176 144 15 0 4 1 1 3 000 396 192 176 144 30 3 9 320 240 10 0 3 352 288 7 5 2 1 2 6 000 396 384 320 240 20 0 7 352 288 15 2 6 1 3 11 880 396 768 320 240 36 0 7 352 288 30 0 6 2 11 880 396 2 000 320 240 36 0 7 352 288 30 0 6 2 1 19 800 792 4 000 352 480 30 0 7 352 576 25 0 6 2 2 20 250 1 620 4 000 352 480 30 7 12 352 576 25 6 10 720 480 15 0 6 720 576 12 5 5 3 40 500 1 620 10 000 352 480 61 4 12 352 576 51 1 10 720 480 30 0 6 720 576 25 0 5 3 1 108 000 3 600 14 000 720 480 80 0 13 720 576 66 7 11 1 280 720 30 0 5 3 2 216 000 5 120 20 000 1 280 720 60 0 5 1 280 1 024 42 2 4 4 245 760 8 192 20 000 1 280 720 68 3 9 1 920 1 080 30 1 4 2 048 1 024 30 0 4 4 1 245 760 8 192 50 000 1 280 720 68 3 9 1 920 1 080 30 1 4 2 048 1 024 30 0 4 4 2 522 240 8 704 50 000 1 280 720 145 1 9 1 920 1 080 64 0 4 2 048 1 080 60 0 4 5 589 824 22 080 135 000 1 920 1 080 72 3 13 2 048 1 024 72 0 13 2 048 1 080 67 8 12 2 560 1 920 30 7 5 3 672 1 536 26 7 5 5 1 983 040 36 864 240 000 1 920 1 080 120 5 16 2 560 1 920 51 2 9 3 840 2 160 31 7 5 4 096 2 048 30 0 5 4 096 2 160 28 5 5 4 096 2 304 26 7 5 5 2 2 073 600 36 864 240 000 1 920 1 080 172 0 16 2 560 1 920 108 0 9 3 840 2 160 66 8 5 4 096 2 048 63 3 5 4 096 2 160 60 0 5 4 096 2 304 56 3 5 6 4 177 920 139 264 240 000 3 840 2 160 128 9 16 7 680 4 320 32 2 5 8 192 4 320 30 2 5 6 1 8 355 840 139 264 480 000 3 840 2 160 257 9 16 7 680 4 320 64 5 5 8 192 4 320 60 4 5 6 2 16 711 680 139 264 800 000 3 840 2 160 300 0 16 7 680 4 320 128 9 5 8 192 4 320 120 9 5 the maximum bit rate for the high profile is 1 25 times that of the constrained baseline baseline extended and main profiles 3 times for hi10p and 4 times for hi422p hi444pp the number of luma samples is 16 16 256 times the number of macroblocks and the number of luma samples per second is 256 times the number of macroblocks per second decoded picture buffering edit previously encoded pictures are used by h 264 avc encoders to provide predictions of the values of samples in other pictures this allows the encoder to make efficient decisions on the best way to encode a given picture at the decoder such pictures are stored in a virtual decoded picture buffer dpb the maximum capacity of the dpb in units of frames or pairs of fields as shown in parentheses in the right column of the table above can be computed as follows dpbcapacity min floor maxdpbmbs picwidthinmbs frameheightinmbs 16 where maxdpbmbs is a constant value provided in the table below as a function of level number and picwidthinmbs and frameheightinmbs are the picture width and frame height for the coded video data expressed in units of macroblocks rounded up to integer values and accounting for cropping and macroblock pairing when applicable this formula is specified in sections a 3 1 h and a 3 2 f of the 2017 edition of the standard 31 level 1 1b 1 1 1 2 1 3 2 2 1 2 2 3 3 1 3 2 4 4 1 4 2 5 5 1 5 2 6 6 1 6 2 maxdpbmbs 396 396 900 2 376 2 376 2 376 4 752 8 100 8 100 18 000 20 480 32 768 32 768 34 816 110 400 184 320 184 320 696 320 696 320 696 320 for example for an hdtv picture that is 1 920 samples wide picwidthinmbs 120 and 1 080 samples high frameheightinmbs 68 a level 4 decoder has a maximum dpb storage capacity of floor 32768 120 68 4 frames or 8 fields thus the value 4 is shown in parentheses in the table above in the right column of the row for level 4 with the frame size 1920 1080 the current picture being decoded is not included in the computation of dpb fullness unless the encoder has indicated for it to be stored for use as a reference for decoding other pictures or for delayed output timing thus a decoder needs to actually have sufficient memory to handle at least one frame more than the maximum capacity of the dpb as calculated above implementations edit a youtube stat that shows h 264 avc and opus h 264 high quality up to 1080p 60fps for youtube uploaded to render in 2009 the html5 working group was split between supporters of ogg theora a free video format which is thought to be unencumbered by patents and h 264 which contains patented technology as late as july 2009 google and apple were said to support h 264 while mozilla and opera support ogg theora eventually google mozilla and opera all supported theora and webm with vp8 32 although theora support was removed in 2023 2024 33 34 microsoft with the release of internet explorer 9 has added support for html 5 video encoded using h 264 at the gartner symposium itxpo in november 2010 microsoft ceo steve ballmer answered the question html 5 or silverlight by saying if you want to do something that is universal there is no question the world is going html5 35 in january 2011 google announced that they were pulling support for h 264 from their chrome browser and supporting both theora and webm vp8 to use only open formats 36 on march 18 2012 mozilla announced support for h 264 in firefox on mobile devices due to prevalence of h 264 encoded video and the increased power efficiency of using dedicated h 264 decoder hardware common on such devices 37 on february 20 2013 mozilla implemented support in firefox for decoding h 264 on windows 7 and above this feature relies on windows built in decoding libraries 38 firefox 35 0 released on january 13 2015 supports h 264 on os x 10 6 and higher 39 on october 30 2013 rowan trollope from cisco systems announced that cisco would release both binaries and source code of an h 264 video codec called openh264 under the simplified bsd license and pay all royalties for its use to mpeg la for any software projects that use cisco s precompiled binaries thus making cisco s openh264 binaries free to use however any software projects that use cisco s source code instead of its binaries would be legally responsible for paying all royalties to mpeg la target cpu architectures include x86 and arm and target operating systems include linux windows xp and later mac os x and android ios was notably absent from this list because it does not allow applications to fetch and install binary modules from the internet 40 41 42 also on october 30 2013 brendan eich from mozilla wrote that it would use cisco s binaries in future versions of firefox to add support for h 264 to firefox where platform codecs are not available 43 cisco published the source code to openh264 on december 9 2013 44 although ios was not supported by the 2013 cisco software release apple updated its video toolbox framework with ios 8 released in september 2014 to provide direct access to hardware based h 264 avc video encoding and decoding 41 software encoders edit avc software implementations feature quickt...
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