ANSI SCTE 128-1 pdf free download

ANSI SCTE 128-1 pdf free download.AVC Video Constraints for Cable Television Part 1- Coding.
Tables 9A, 9B and 9C list the allowed compression formats and constraints for associated parameters (for non low delay mode applications). Table 9A covers Level 3.0 formats, Table 9B covers Level 4.0 formats, and Table 9C covers Level 4.2 formats. AVC Receivers that are capable of decoding Level 4.0 formats are also expected to be capable of decoding Level 3.0 formats. AVC Receivers that are capable of decoding Level 4.2 formats are also expected to be capable of decoding Level 4.0 and Level 3.0 formats. See Section 7.2. 1.6 which specifies additional constraints for low delay mode applications. The value of “MaxFrameBuffers” is specified in Tables 9A, 9B and 9C below. For each of the resolutions in Tables 9A, 9B and 9C, the coded video sequence shall not require the units of frame buffers in the DPB (Decoded Picture Buffer) to be greater than MaxFrameBuffers to enable the output of the decoded pictures at the specified output times. The syntax element num_ ref_ frames in the AVC Sequence Parameter Set shall be set to a value less than or equal to the value MaxFrameBuffers. If the syntax element max_ dec_ frame_ buffering is present in the VUI parameters syntax structure of the sequence parameter set, its value shall be set equal to MaxFrameBuffers. If the syntax element max_ _dec_ frame_ buffering is not present in the VUI parameters syntax structure of the sequence parameter set, the bitstream shall still obey the same constraints as if the syntax element max_ _dec_ frame_ buffering had been present and equal to MaxFrameBuffers.
In some cases, pic_ struct values (1, 2, 5 or 6) could cause field parity issues in receivers when decoded pictures are repeated. 2. Every SGOP shall be coded so that it is fully reconstructable. Note: This constrains the FPPs to point to reference pictures within the SGOP. 3. The maximum number of reference pictures for Low Delay Mode shall be one less than the maximum number of reference pictures for non-Low Delay mode. Note: If required, AVC receivers can determine the display frame rate from the VUI parameters num_ units_ in_ tick and time_ scale (see Table 11). Note: Per Annex E of AVC [2], low_ delay_ hrd_ flag can either be present in the VUI or conveyed by other means. If low_ delay_ hrd_ flag is present in the VUI, then (per Annex D and Annex E of AVC) bitstreams must include buffering period SEI and picture_ timing SEI with the appropriate values of CPB and DPB delay values for each access unit. If low_ delay_ hrd_ flag is present in the VUI and set to 1′, then AVC receivers must use the CPB and DPB delay values from the picture timing SEI for T-STD management instead of the PTS and DTS values coded in the PES header of each access unit (per section 2.14.3 of 13818-1 [1]). If low_ delay_ hrd_ flag is not present in the VUI and fixed_ frame_ rate_ flag is set to“0′, AVC receivers are expected to assume Low Delay mode (i.e..,. low_ delay_ hrd_ flag =‘1’which allows buffer underflow) and may use the PTS and DTS values coded in the PES header for T STD management.ANSI SCTE 128-1 pdf download.