DICOM PS3.17 2020b - Explanatory Information

MM.2.4 MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265 (Current)
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### MM.2.4 MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265

Identifying the location of the requested frames within an MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265 data stream is non-trivial, but if achieved, then little else other than changes to the starting times are likely to be required for MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265 encoded data, as the use-cases for such encoded data (e.g., endoscopy) are unlikely to include explicit frame related data. See the note below however for comments on "single-frame" results.

An application holding data in MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265 format is unlikely to be able to create a range with a frame increment of greater than one (a calculated frame list with a 3rd value greater than one), and if such a request is made, it might return a status of AA02: Unable to extract Frames.

The approximation feature of the Time Range form of request is especially suitable for data held in MPEG-2, MPEG-4 AVC/H.264 or HEVC/H.265 form, as it allows the application to find the nearest surrounding key frames, which greatly simplifies editing and improves quality.

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DICOM PS3.17 2020b - Explanatory Information