IEC TR 62712:2011 pdfダウンロード

IEC TR 62712:2011 pdfダウンロード。Professional tape-less camera recorder
1 Scope
This Technical Report summarizes the results of the study on products and market status of professional tape-less camera recorders. This report also includes the guideline on the possibilities of standardizations for professional tape-less camera recorders, including the following components:
– codec;
– file format;
– metadata;
– recording media;
– interface.
NOTE 1 Each professional tape-less camera recorder used for the product survey is defined as “PRODUCT”.
NOTE 2 Since each PRODUCT is also defined as a “product series” of each manufacturer, PRODUCT may include two or more models with different product specifications.
NOTE 3 Some of the names described in this report represent a trademark or registered trademark of the respective companies. However, symbols such as TM and ® are omitted in this report.
NOTE 4 The interface specifications investigated in this project were limited to a file transfer or compressed bit stream transfer since this report is focusing on a file-based specification.
NOTE 5 The detail specification of each PRODUCT is shown in Annex A.
2 Result of product survey
2.1 General
In this report, eight types of PRODUCTs for investigation are listed, based on the information given by camera recorder manufacturers.
2.2 Codec
2.2.1 Video codec
Each PRODUCT uses efficient video compression formats such as MPEG-2, MPEG-4 AVC/H.264, JPEG2000 and DV. Since these specifications are defined as international standards of ISO/IEC, they can be referred to as a normative reference. The video compression format of PRODUCT-C is defined as SMPTE standard and is also defined as an IEC standard for digital VTR format. It can therefore also be referred to as a normative reference. Since all the compression formats listed in Table 1 are a well-known codec scheme and widely supported in industry, compatibility is ensured with equipment other than camera recorders.
2.2.2 Audio codec It is characterized that almost all PRODUCTs listed in Table 2 use uncompressed linear PCM audio for audio codec. Altough a linear PCM specification is not defined in any published standard, linear PCM is also widely supported in many products and compatibility is ensured as well as video codec.
2.3 File format As a file format, MXF (Material eXchange Format) defined as SMPTE standard is adopted in the PRODUCT listed in Table 4. In order to ensure operational compatibility, several kinds of Operational Patterns are defined in the MXF specification. It is characterized that the camera recorders supporting MXF adopt OP-1 a (Operational Pattern-1 a) or OP-Atom (Operational Pattern-Atom). In case of shooting materials by a camera recorder, since each taken material is wrapped in an individual clip as file, complex operational patterns are not required. OP-1 a is used for wrapping video and audio to a single file to facilitate contents exchange. On the other hand, OP-Atom is used for wrapping video and audio in individual files to facilitate contents editing.
NOTE MXF standards are under revision in SMPTE and, in parallel, also under study for standardization in the IEC TC1 00/TA6 working group. Since it is confirmed that the MXF specification has been adopted for various types of PRODUCTs, it would be significant to standardize MXF as an IEC standard in order to ensure compatibility among different types of equipment. Therefore, it is desirable to start studying standardization in IEC when primary MXF revision projects in SMPTE finish the revision work.