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Samples in image sequence tracks must be either intra-coded images or inter-picture predicted images with reference to only intra-coded images. These constraints of inter-picture prediction reduce the decoding latency for accessing any particular image within a HEVC image sequence track.
The ''.heic'' and ''.heics'' file name extensions are conventionally used for HEVC-coded HEIF files.<ref name="WWDC2017 511">{{cite web |url=https://developer.apple.com/videos/play/wwdc2017/511 |title=Working with HEIF and HEVC - WWDC 2017 - Videos |website=Apple Developer |access-date=2019-01-19 |archive-date=2019-01-20 |archive-url=https://web.archive.org/web/20190120194504/https://developer.apple.com/videos/play/wwdc2017/511 |url-status=live }}</ref> Apple products, for instance,<ref name="WWDC2017 513-1">{{cite web |url=https://developer.apple.com/videos/play/wwdc2017/513 |title=High Efficiency Image File Format |time=0:09:26 |publisher=[[Apple Inc.|Apple]] |date=June 2017 |access-date=2017-11-22 |archive-date=2017-12-01 |archive-url=https://web.archive.org/web/20171201032622/https://developer.apple.com/videos/play/wwdc2017/513 |url-status=live }}</ref> will only produce files with these extensions, which indicate clearly that the data went through HEVC encoding.<ref name="CNET">{{cite web |url=https://www.cnet.com/news/apple-ios-boosts-heif-photos-over-jpeg-wwdc |title=How Apple is squeezing more photos into your iPhone – FAQ: Apple's newest iPhone software attempts to move the world out of the JPEG era. |publisher=[[CNET]] |first=Stephen |last=Shankland |date=June 16, 2017 |access-date=2017-11-21 |archive-date=2017-11-16 |archive-url=https://web.archive.org/web/20171116181530/https://www.cnet.com/news/apple-ios-boosts-heif-photos-over-jpeg-wwdc/ |url-status=live }}</ref>
{{anchor|AVCI}}{{anchor|AVC}}
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[[H.264/MPEG-4 AVC|Advanced Video Coding]] (AVC, ITU-T H.264) is an older encoding format for video and images, first standardized in 2003. It is also specified as a codec to be supported in HEIF in normative Annex 5 to ISO/IEC 23008-12. The registered MIME types are <code>image/avci</code> for still images and <code>image/avcs</code> for sequences. The format is simply known as AVCI.
Apple products support playback of AVC-encoded ''.avci'' still image files and ''.avcs'' image sequence files<ref name="WWDC2017 513-2">{{cite web |date=June 2017 |title=High Efficiency Image File Format |url=https://developer.apple.com/videos/play/wwdc2017/513 |url-status=live |archive-url=https://web.archive.org/web/20171201032622/https://developer.apple.com/videos/play/wwdc2017/513 |archive-date=2017-12-01 |access-date=2017-11-22 |publisher=[[Apple Inc.|Apple]] |time=0:09:26}}</ref> but will only generate ''.heic'' files.
=== AVIF: AV1 in HEIF{{Anchor|AVIF|AV1}} ===
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