Thread: Embedding audio/video in epub files
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Old 08-08-2021, 10:32 PM   #26
DNSB
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Not to mention that the various generations of the ePUB specs are strewn with MUST and SHOULD. Treating any SHOULD item as a null operation makes an ePUB renderer compliant. See 2.2 EPUB Reading Systems from the EPUB 3.2 standard documentation.

For instance:
Quote:
It is recommended that Reading Systems support at least one of the H.264 [H264] and VP8 [RFC6386] video codecs, but this is not a conformance requirement – a Reading System might support other video codecs, or none at all.
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