1、 Reference numberISO/IEC 14496-2:2004/Amd.1:2004(E)ISO/IEC 2004Information technology Coding of audio-visual objects Part 2: Visual AMENDMENT 1: Error resilient simple scalable profile Technologies de linformation Codage des objets audiovisuels Partie 2: Codage visuel AMENDEMENT 1: Profil descalade
2、simple rsilient derreur Amendment 1:2005 toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-2:05Amendment 1:2004 to International Standard ISO/IEC 14496-2:2004 has been adopted withoutmodification as Amendment 1:2005 to CAN/CSA-ISO/IEC 14496-2:05. This Amendment was reviewed bythe CSA Technical Comm
3、ittee on Information Technology (TCIT) under the jurisdiction of the StrategicSteering Committee on Information Technology and deemed acceptable for use in Canada.October 2005ISO/IEC 14496-2:2004/Amd.1:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lic
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8、1 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2004 All rights reservedISO/IEC 14496-2:2004/Amd.1:2004(E) ISO/IEC 2004 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commiss
9、ion) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO a
10、nd IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/I
11、EC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national
12、bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for id
13、entifying any or all such patent rights. Amendment 1 to ISO/IEC 14496-2:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 14496-2:2004/Amd.1:2004(E) iv ISO/IEC 2004 All ri
14、ghts reservedIntroduction In ISO/IEC 14496-2:2004, the bitstream syntax of the Simple Scalable Profile does not allow the use of the error resilience tools. As the enhancement layer can only be decoded if it is received error-free this limits the use of scalable video to error-free communication env
15、ironments. This would exclude mobile communications, a significant future market for MPEG-4 SSP. Scalable video can be quite useful in many other applications. For instance, matching different or varying network bandwidths, video multicast to heterogeneous end systems and more importantly, providing
16、 different subjective quality of video content to subscribers of a given video service depending on their network tariffs and viewing preferences. As such, ISO/IEC has defined the addition of an MPEG-4 Error Resilient Simple Scalable Profile. This Amendment describes the technical changes for this p
17、rofile. In addition, the new Level 0b is added to the MPEG-4 Simple Visual Profile and the amendments are described in this Amendment. ISO/IEC 14496-2:2004/Amd.1:2004(E) ISO/IEC 2004 All rights reserved 1Information technology Coding of audio-visual objects Part 2: Visual AMENDMENT 1: Error resilien
18、t simple scalable profile In 6.2.5, replace: if (video_object_layer_shape != “binary only”) vop_quant 3-9 uimsbf if(video_object_layer_shape=”grayscale”) for(i=0; i 0) sprite_trajectory() if (reduced_resolution_vop_enable) b) The maximum f_code shall be 1; c) The intra_dc_vlc_threshold shall be 0; d
19、) The maximum horizontal luminance pixel resolution shall be 176 pels/line; e) The maximum vertical luminance pixel resolution shall be 144 pels/VOP; f) If AC prediction is used, the following restriction applies: QP value shall not be changed within a VOP (or within a video packet if video packets
20、are used in a VOP). If AC prediction is not used, there are no restrictions to changing QP value. with: 11 For Simple Profile Level L0 and for Simple Profile Level L0b, the following restrictions apply: a) The maximum frame rate shall be 15 frames per second; b) The maximum f_code shall be 1; c) The
21、 intra_dc_vlc_threshold shall be 0; d) The maximum horizontal luminance pixel resolution shall be 176 pels/line; e) The maximum vertical luminance pixel resolution shall be 144 pels/VOP; f) If AC prediction is used, the following restriction applies: QP value shall not be changed within a VOP (or wi
22、thin a video packet if video packets are used in a VOP). If AC prediction is not used, there are no restrictions to changing QP value. Add the following row to Table N-1 (above the row for Simple Profile/Level0): Simple L0b QCIF 1 1 x Simple 1 198 99 1485 N.A. 20 20 2048 N. A. N. A. 128 N. A. ISO/IE
23、C 14496-2:2004/Amd.1:2004(E) 10 ISO/IEC 2004 All rights reservedAdd the following rows to the end of the Table N-1: Error resilient simple scalable L2 CIF 4 4 x Simple or Simple Scalable 1 3168 792 23760 N.A. 40 40 4096 N.A. N A. 256 1 spatial or temporal enhancement layer Error resilient simple sca
24、lable L1 CIF 4 4 x Simple or Simple Scalable 1 1782 495 7425 N. A. 40 40 2048 N.A. N.A. 128 1 spatial or temporal enhancement layer Error resilient simple scalable L0 QCIF 1 1 x Simple or Simple Scalable 1 446 124 1856 N.A. 10 10 2048 N.A. N.A. 128 1 spatial or temporal enhancement layer ISO/IEC 14496-2:2004/Amd.1:2004(E) ICS 35.040 ISO/IEC 2004 All rights reserved
