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An image sequence that is not a thumbnail image sequence or an auxiliary image sequence. Typically contains full-resolution displayable images.
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ISOBMFF specifies indications for video and image sequence tracks, such as width and height of the coded images, color information, such as the ICC profile or color primaries, rectangular cropping, transformation matrix, e.g. for rotation. Additionally, timed metadata track(s) can be used to convey Exif, XMP, and MPEG-7 metadata applying to time-parallel samples of the linked image sequence track.
The most important features that enable controlling the playback of an HEIF file are listed below. Some of these features were introduced in the [[ISO base media file format|ISOBMFF]] or [[ISO/IEC 14496-15]] and are explicitly inherited by HEIF, while other features were specifically designed for the HEIF standard.
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! colspan="3" |'''Features controlling Image sequence playback'''
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'''Feature'''
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'''First appeared in'''
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'''Description'''
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non-displayable sample
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ISO/IEC 14496-15
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Is never displayed, but can be used as a reference for predicting other images in the track.
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timed vs. non-timed playback
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HEIF
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In timed playback, the image sequence is played as video, whereas in non-timed playback the samples of the track are displayed by other means, such as an image gallery. Non-timed playback may be indicated e.g. when a track is used for achieving a better compression efficiency for an exposure stack.
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edit list
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ISOBMFF
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A list of ranges of the image sequence track in their playback order. Enables modifying the playback order and pace of samples.
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looping
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HEIF
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HEIF allows indicating edit list repetition e.g. for looping animations. The repetition can be indicated to last for a certain duration or be infinite.
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cropping and rotation
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ISOBMFF
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Rectangular cropping and rotation by 90, 180, 270 degrees can be specified.
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