1、 Rec. ITU-R BT.1380-1 1 RECOMMENDATION ITU-R BT.1380-1 Standards for bit rate reduction coding systems for SDTV(Question ITU-R 12/6) (1998-2006) Scope This Recommendation covers the use of ITU-T Recommendations H.262 (MPEG-2 Video) and H.264 (MPEG-4 AVC) as a choice of the video source coding scheme
2、s for a series of SDTV broadcasting applications. The ITU Radiocommunication Assembly, considering a) that rapid progress is being made in bit rate reduction coding techniques; b) that bit rate reduction coding of digital SDTV signals has found wide applications for emission by terrestrial means and
3、 by satellite, for SNG1/ENG2, for contribution, for both primary and secondary distribution by telecommunication networks and by cable networks; c) that a number of Radiocommunication Groups are studying the uses of bit rate reduction coding in the various applications; d) that ITU-R Recommendations
4、 on user requirements have been established for emission by terrestrial means and by satellite, for contribution, for both primary and secondary distribution by telecommunication networks and by cable networks; e) that Recommendation ITU-R BT.1203 for user requirements for generic bit rate reduction
5、 coding for an end-to-end television system (SNG/ENG, contribution, primary and secondary distribution, emission and related applications) has been established; f) that ITU-T Recommendation H.264 (MPEG-4 AVC) offers a broader compression toolkit and a more efficient compression than ITU-T Recommenda
6、tion H.262 (MPEG-2 Video), and that for certain applications it may provide a superior choice since it offers a greater pixel depth, over the one offered by ITU-T H.262, as well as improved coding efficiency, In this Recommendation the acronym SDTV refers to signals based on Recommendation ITU-R BT.
7、601 (Part A). 1The definition of satellite news gathering (SNG) can be found in Annex 1 1.1 of Recommendation ITU-R SNG.770 and 1 of Recommendation ITU-R BT.1205. 2The definition of electronic news gathering (ENG) can be found in Annex 3 2 of Recommendation ITU-R SA.1154 and 3 of Report ITU-R BT.206
8、9. 2 Rec. ITU-R BT.1380-1 recommends 1 that for the use of ITU-T Recommendation H.262, the following profiles and levels should preferably be used respectively for SNG/ENG, contribution, studio production, primary and secondary distribution and for the emission of SDTV signals by terrestrial and sat
9、ellite delivery; SNG/ENG Contribution Studio production Primary distribution Terrestrialemission Satellite emission Secondary distribution MPML 422PML(1)422PML(2)422PML(1)MPML MPML MPML NOTE 1: For studio production, DV-based coding(3)may also be used. (1)Taken from ITU-T Recommendation J.89. (2)Bit
10、 rate limited to 50 Mbit/s, taken from Recommendation ITU-R BR.1376. (3)Bit rate limited to 25 Mbit/s either for 4:2:0 or for 4:1:1 sampling structure and at 50 Mbit/s for 4:2:2 sampling structure, taken from Recommendation ITU-R BR.1376. 2 that for the use of ITU-T Recommendation H.264, the followi
11、ng profiles and levels should preferably be used respectively for SNG/ENG, contribution, studio production, primary and secondary distribution and for the emission of SDTV signals by terrestrial and satellite delivery; SNG/ENG Contribution Studio production Primary distribution Terrestrialemission S
12、atellite emission Secondary distribution Level 3/ high 10 Level 3/ high 4:2:2 Level 3/ high 4:2:2 Level 3/ high 4:2:2 Level 3/ main(1)Level 3/ main Level 3/ main (1) Some administrations have already selected this main profile for this application. NOTE 1 The choice between ITU-T Recommendation H.26
13、2 or ITU-T Recommendation H.264 for the source coding method used by individual administrations will depend on a number of considerations including interoperability with legacy equipment, efficient use of the bit rate available in the delivery channel, harmonization with source coding methods adopted by neighbouring administrations for digital terrestrial and satellite broadcast channels, etc. Note from the Secretariat: ITU-T Recommendations H.262 and ITU-T H.264 are available in electronic form at the following address: http:/www.itu.int/md/R03-WP6A-C-0110/en.
