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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Yeah, it seems like it should be more like:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaxDecPicBuffering = 1 (Current) + MaxNumNegativePics (=MaxForwardRefs) + MaxNumPositivePics (=MaxBackwardRefs)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>With assuming <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaxNumNegativePics = maxNumReferences (really MaxNumForwardReferences)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaxNumPositivePics = limited by gop structure (reordering) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For a standard GOP structure with non-reference B-frames (coded order=Pbbb):<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaxDecPicBuffering = 1 (Current) + maxNumReferences + 1 ( 1P available as backward reference, limiting NumPositivePics to 1) = 2+maxNumReferences<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For 1-deep B-pyramid where the middle-B is a reference (display order=bBbP, coded order=PBbb):<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaxDecPicBuffering = 1 (Current) + maxNumReferences + 2 (1P + 1B available as backward references, limiting NumPositivePics to 1) = 3+maxNumReferences<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Olivier<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> x265-devel [mailto:x265-devel-bounces@videolan.org] <b>On Behalf Of </b>Steve Borho<br><b>Sent:</b> Wednesday, September 25, 2013 3:36 PM<br><b>To:</b> Development for x265<br><b>Subject:</b> Re: [x265] [PATCH] Added support for multiple references<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Wed, Sep 25, 2013 at 5:27 PM, Olivier Lapicque <<a href="mailto:olapicque@nvidia.com" target="_blank">olapicque@nvidia.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Shouldn’t it be </span>X265_MAX(m_numReorderPics[i]<b> + 2</b>, _param->maxNumReferences<b>+1</b>) <span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Unlike H.264, the picture is added to the DPB before being decoded (so the current picture always takes up one slot in the DPB)</span><o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I was just staring at that line myself. It would probably be more clear to add the +1 after the X265_MAX. What I wasn't sure about was whether m_maxDecPicBuffering is supposed to also include the max B frame count as well.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>--<o:p></o:p></p></div><div><p class=MsoNormal>Steve<o:p></o:p></p></div></div></div></div></div>
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