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MPEGGroup / FileFormat

MPEG file format discussions
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SampleEntry class for encrypted systems streams #48

Open podborski opened 2 years ago

podborski commented 2 years ago

From the ISOBMFF text (7th edition) it is not clear to me which SampleEntry class is used for encs. Table 5 does not have an entry for it. And I can not find encs in Part 14 either.

<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">

Stream (Track) Type Sample-Entry Code SampleEntry Class
Video encv VisualSampleEntry
Audio enca AudioSampleEntry or AudioSampleEntryV1
Metadata encm MetaDataSampleEntry
Text enct SimpleTextSampleEntry
Subtitle encu XMLSubtitleSampleEntry
System (a) encs  
Font encf FontSampleEntry
Haptics encp HapticSampleEntry
Volumetric visual enc3 VolumetricVisualSampleEntry

a   System streams are defined in ISO/IEC 14496-14‎[22].

cconcolato commented 1 year ago

@jeanlf any idea?

jeanlf commented 1 year ago

it's MpegSampleEntry ( extends SampleEntry ('mp4s') ), defined in 14496-14

cconcolato commented 1 year ago

@podborski can we add that to the defect report?

cconcolato commented 4 months ago

It has not been added so far to the defect report. We should do so at the Sapporo meeting.