Although no maximum length for an HDMI cable is specified, signal attenuation (dependent on the cable's construction quality and conducting materials) limits usable lengths in practice [70] [71] and certification is difficult to achieve for lengths beyond 13m. [72] HDMI 1.3 defines two cable categories: Category 1-certified cables, which have been tested at 74.25MHz (which would include resolutions such as 720p60 and 1080i60), and Category 2-certified cables, which have been tested at 340MHz (which would include resolutions such as 1080p60 and 4K30). [5] :§4.2.6 [63] [73] Category 1 HDMI cables are marketed as "Standard" and Category 2 HDMI cables as "High Speed". [3] This labeling guideline for HDMI cables went into effect on October 17, 2008. [74] [75] Category 1 and 2 cables can either meet the required parameter specifications for inter-pair skew, far-end crosstalk, attenuation and differential impedance, or they can meet the required non-equalized/equalized eye diagram requirements. [5] :§4.2.6 A cable of about 5 meters (16 feet) can be manufactured to Category 1 specifications easily and inexpensively by using 28 AWG (0.081mm 2) conductors. [70] With better quality construction and materials, including 24AWG (0.205mm 2) conductors, an HDMI cable can reach lengths of up to 15 meters (49 feet). [70] Many HDMI cables under 5meters of length that were made before the HDMI 1.3 specification can work as Category 2 cables, but only Category 2-tested cables are guaranteed to work for Category 2 purposes. [76] If you're at all familiar with TV ports, or even have just taken a moment to familiarize yourself with the basic connections listed above, you might still find that some TVs have a connection or two that aren't found on that list. These unusual connectors generally aren't used by the end user, because they're not for connecting any sort of media device or entertainment equipment. a b c d "HDMI Licensing, LLC Announces Features of the Upcoming HDMI Specification Version 1.4". HDMI Licensing, LLC. May 28, 2009. Archived from the original on June 1, 2009 . Retrieved May 28, 2009. a b Even for a compressed audio codec that a given HDMI device cannot transport, the source device may be able to decode the audio codec and transmit the audio as uncompressed LPCM.

An HDMI extender is a single device (or pair of devices) powered with an external power source or with the 5V DC from the HDMI source. [83] [84] [85] Long cables can cause instability of HDCP and blinking on the screen, due to the weakened DDC signal that HDCP requires. HDCP DDC signals must be multiplexed with TMDS video signals to comply with HDCP requirements for HDMI extenders based on a single Category 5/ Category 6 cable. [86] [87] Several companies offer amplifiers, equalizers and repeaters that can string several standard HDMI cables together. Active HDMI cables use electronics within the cable to boost the signal and allow for HDMI cables of up to 30 meters (98 feet); [83] those based on HDBaseT can extend to 100 meters; HDMI extenders that are based on dual Category 5/ Category 6 cable can extend HDMI to 250 meters (820 feet); while HDMI extenders based on optical fiber can extend HDMI to 300 meters (980 feet). [84] [85] Licensing [ edit ] The Display Data Channel (DDC) is a communication channel based on the I 2C bus specification. HDMI specifically requires the device implement the Enhanced Display Data Channel (E-DDC), which is used by the HDMI source device to read the E-EDID data from the HDMI sink device to learn what audio/video formats it can take. [5] :§§8.1,CEC-1.2–CEC-1.3 HDMI requires that the E-DDC implement I 2C standard mode speed (100 kbit/s) and allows it to optionally implement fast mode speed (400kbit/s). [5] :§4.2.8High-Definition Multimedia Interface ( HDMI) is a proprietary audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device, such as a display controller, to a compatible computer monitor, video projector, digital television, or digital audio device. [3] HDMI is a digital replacement for analog video standards.

Display Stream Compression (DSC) 1.2 is used for video formats higher than 8K with 4:2:0 chroma subsampling

HDMI V2.1

DisplayPort connectors on them, but these are niche applications that have not taken hold in the market." [199] Beginning with the seventh generation of video game consoles, most consoles support HDMI. Video game consoles that support HDMI include the Xbox 360 (1.2a), Xbox One (1.4b), Xbox One S (2.0a), Xbox One X (2.0b), PlayStation 3 (1.3a), PlayStation 4 (1.4b), PlayStation 4 Pro (2.0a), Wii U (1.4a), Nintendo Switch (1.4b), Nintendo Switch (OLED model) (2.0a), Xbox Series X and Series S (2.1), and PlayStation 5 (2.1).