Organisation internationale de normalisation

m35133 Revised FDIS text of Common Encryption 2nd Edition

Thank you for making sure the published text is excellent.

4. Action Points / Ballots

ISO/IEC FDIS 23001-7 2nd Edition (SC 29 N 14425)	Part 7: Common encryption format for ISO base media file format	FDIS (2014-11-17)
ISO/IEC 23001-7:201x/PDAM 1 (SC 29 N 14057)	Part 7: Common encryption format for ISO base media file format AMENDMENT 1: Simple pattern-based encryption mode	PDAM (2014-05-12)

12. CICP (23001-8)

    1. Topics

2. Contributions

Number	Session	Title	Source	Disposition

3. Summary of discussions

4. Action Points

13. Common encryption format for MPEG-2 TS (23001-9)

    1. Topics

       1. ISO/IEC 23001-9 Common encryption format for MPEG-2 TS

This format defines a way to encrypt media (audio, video, etc.) in files of the ISO base media file format family. By using a common encryption format, a single media asset can be used by several services and devices using different digital rights management systems, and the implementation complexity that would be consequent on having duplicate files and formats for the same content can be reduced or eliminated.

2. Contributions

Number	Session	Title	Source	Disposition
m34865	MPEG-2	Sparse encryption in 23001-9 AMD1	Alex Giladi	Accepted N14850

3. Summary of discussions

4. Action Points

ISO/IEC 23001-9:2014/PDAM 1 (SC 29 N 14495)

Part 9: Common Encryption for MPEG-2 Transport Streams, AMENDMENT 1: Support of Sparse Encryption

PDAM (2015-01-07)

14. Timed metadata metrics of Media in ISOBMFF (23001-10)

    1. Topics

       1. ISO/IEC 23001-10 Timed Metadata Metrics of Media in the ISO Base Media File Format

Specifies a storage format for commonly used, timed metadata metrics of media, such as quality related PSNR, SSIM, and others, for carriage in metadata tracks of the ISO Base Media File Format.

2. Contributions

Number	Session	Title	Source	Disposition
m35108	File Format	Proposed Enhancements to ISO/IEC 23001-10	Ozgur Oyman	Accepted 14851
m34958	DASH	Support for Quality Optimization in DASH Live Streaming	Zhi Li, Josh Gahm, Ali C. Begen	noted

3. Summary of discussions

   1. m35108 Proposed Enhancements to ISO/IEC 23001-10

With some minor online editorial changes, we publish a study document.

2. m34958 Support for Quality Optimization in DASH Live Streaming

The accuracy field in the sample entry is applicable to all samples, so it doesn’t help here. We could say that samples of 0 size have no metrics, but now the sample size table is no longer documenting a constant size. We could have multiple sample entries, but this might affect the chunking performance (but with a metric code of ‘none’ we could in this case have constant sample sizes).

It does seem that a metric called ‘size’ (clearly useless when both tracks are in the same file), defined as the sum of the sizes of the time-aligned video samples, could be useful in the DASH case.

Yes, we could have a v2 that multiplexes the metrics for multiple video tracks in one metric track, but using track references only works if the video tracks are in the same file (whereupon it’s not needed). If the track references are there but refer to a track not in the file, then the DASH MPD (e.g.) will need to provide the mapping from track_ID to representation. But in that case also, there could be multiple metadata tracks in the metadata file, each linked to its video track. This problem needs joint study of file format and DASH experts. (Another possibility is to have a copy of the video track sample table, but using a data reference for the sample data, by the way, but this looks ugly.)

Overall, we note that Metadata carriage is out for DIS ballot and we would not be comfortable accepting new ideas into a document that has no comment ballot. Can we do this in future? We suggest a re-submission with a view to an amendment in future.

4.