<div dir="ltr"><div style><span class="" id="Sp1.s2_o" style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px;background-color:rgb(229,245,255)"><span class="" value="7070/pron" id="token_1" style="background-color:rgb(185,231,253)">I</span> <span class="" value="4004/verb:plain" id="token_2">am</span> <span class="" value="044c/verb:plain" id="token_3">working</span> <span class="" value="5050/prep" id="token_4">on</span> <span class="" value="1013/noun:acronym" id="token_5">CBR</span> <span class="" value="4c4c/verb:prespart" id="token_6">streaming</span> <span class="" value="1010/noun:common" id="token_7">applications</span> <span class="" value="6465/conj" id="token_8">and</span> <span class="" value="7070/pron" id="token_9">I</span> <span class="" value="0404/verb:plain" id="token_10">compare</span> <span class="" value="1013/noun:acronym" id="token_11">x264</span> <span class="" value="5050/prep" id="token_12">to</span> <span class="" value="1011/noun:propernoun" id="token_13">Mainconcept</span> <span class="" value="5050/prep" id="token_14">in</span> <span class="" value="1010/noun:common" id="token_15">terme</span> <span class="" value="5050/prep" id="token_16">of</span> <span class="" value="1010/noun:common" id="token_17">quality</span> <span class="" id="token_18">(</span><span class="" value="1013/noun:acronym" id="token_19">PSNR</span><span class="" id="token_20">,</span> <span class="" value="1013/noun:acronym" id="token_21">SSIM</span><span class="" id="token_22">)</span><span class="" id="token_23">,</span> <span class="" value="1010/noun:common" id="token_24">performance</span> <span class="" id="token_25">(</span><span class="" value="1010/noun:common" id="token_26">frame</span> <span class="" value="3838/verb:pastpart" id="token_27">encoded</span> <span class="" value="5050/prep" id="token_28">per</span> <span class="" value="1010/noun:common" id="token_29">second</span><span class="" id="token_30">)</span> <span class="" value="6465/conj" id="token_31">and</span> <span class="" value="1010/noun:common" id="token_32">rate</span> <span class="" value="1010/noun:common" id="token_33">control</span> <span class="" value="1010/noun:common" id="token_34">accuracy</span><span class="" id="token_35">.</span></span><br style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px">
<br style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"><span class="" id="Sp2.s2_o" style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"><span class="" value="7070/pron" id="token_1">I</span> <span class="" value="0404/verb:plain" id="token_2">read</span> <span class="" value="3c3d/det" id="token_3">the</span> <span class="" id="token_4">"</span><span class="" value="2035/adj:base" id="token_5">Video</span> <span class="" value="1010/noun:common" id="token_6">Codec</span> <span class="" value="1010/noun:common" id="token_7">Comparison</span><span class="" id="token_8">"</span> <span class="" value="5050/prep" id="token_9">of</span> <span class="" value="1010/noun:common" id="token_10">CS</span> <span class="" value="1013/noun:acronym" id="token_11">MSU</span> <span class="" value="1011/noun:propernoun" id="token_12">Graphics&Media</span> <span class="" value="1010/noun:common" id="token_13">Lab</span><span class="" id="token_14">,</span> <span class="" value="2035/adj:base" id="token_15">Video</span> <span class="" value="1010/noun:common" id="token_16">Group</span><span class="" id="token_17">.</span></span><span style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"> </span><span class="" id="Sp2.s3_o" style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"><span class="" value="2828/det" id="token_18">This</span> <span class="" value="1010/noun:common" id="token_19">comparison</span> <span class="" value="0404/verb:plain" id="token_20">shows</span> <span class="" value="5c5d/conj" id="token_21">that</span> <span class="" value="1013/noun:acronym" id="token_22">x264</span> <span class="" value="4004/verb:plain" id="token_23">is</span> <span class="" value="3c3d/det" id="token_24">the</span> <span class="" value="2022/adj:superlative" id="token_25">best</span> <span class="" value="1010/noun:common" id="token_26">codec</span> <span class="" value="5050/prep" id="token_27">in</span> <span class="" value="1010/noun:common" id="token_28">terme</span> <span class="" value="5050/prep" id="token_29">of</span> <span class="" value="1013/noun:acronym" id="token_30">SSIM</span><span class="" id="token_31">,</span> <span class="" value="6868/conj" id="token_32">but</span> <span class="" value="7070/pron" id="token_33">I</span> <span class="" value="0808/verb:plain" id="token_34">cannot</span> <span class="" value="4848/verb:inf" id="token_36">find</span> <span class="" value="3c3d/det" id="token_37">the</span> <span class="" value="2829/det" id="token_38">same</span> <span class="" value="1010/noun:common" id="token_39">results</span> <span class="" value="5050/prep" id="token_40">because of</span> <span class="" value="3c3d/det" id="token_41">the</span> <span class="" value="1010/noun:common" id="token_42">rate</span> <span class="" value="1010/noun:common" id="token_43">control</span><span class="" id="token_44">.</span></span></div>
<div style><span class="" style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"><span class="" value="7070/pron"><br></span></span></div>
<div style><span class="" id="Sp2.s4_o" style="color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif;font-size:13px"><span class="" value="7070/pron" id="token_45">I</span> <span class="" value="0404/verb:plain" id="token_46">use</span> <span class="" value="1010/noun:common" id="token_47">sequences</span> <span class="" value="5050/prep" id="token_48">of</span> <span class="" id="token_49">200</span> <span class="" value="1010/noun:common" id="token_50">frames</span> <span class="" value="5050/prep" id="token_51">for</span> <span class="" value="2827/det" id="token_52">my</span> <span class="" value="1010/noun:common" id="token_53">tests</span><span class="" id="token_54">.</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="Sp2.s5_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="3030/adv" id="token_55">Here</span> <span class="" value="4004/verb:plain" id="token_56">is</span> <span class="" value="3c3e/det" id="token_57">an</span> <span class="" value="1010/noun:common" id="token_58">exemple</span> <span class="" value="5050/prep" id="token_59">of</span> <span class="" value="3c3d/det" id="token_60">the</span> <span class="" value="1010/noun:common" id="token_61">command</span> <span class="" value="1010/noun:common" id="token_62">line</span> <span class="" value="7070/pron" id="token_63">I</span> <span class="" value="0404/verb:plain" id="token_64">use</span> <span class="" value="5050/prep" id="token_65">for</span> <span class="" value="1013/noun:acronym" id="token_66">HD</span> <span class="" value="1010/noun:common" id="token_67">sequence</span> <span class="" id="token_68">:</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span></div>
<div style><span class="" id="Sp2.s6_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">x264</span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_70" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s8_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1013/noun:acronym" id="token_71">input-res</span> <span class="" value="1013/noun:acronym" id="token_72">1920x1080</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_73" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s10_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1010/noun:common" id="token_74">fps</span> <span class="" id="token_75">25</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_76" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s12_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1010/noun:common" id="token_77">bitrate</span> <span class="" id="token_78">8000</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_79" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s14_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1010/noun:common" id="token_80">vbv-maxrate</span> <span class="" id="token_81">8000</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_82" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s16_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="0404/verb:plain" id="token_83">vbv-bufsize</span> <span class="" id="token_84">3000</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="token_85" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif">--</span><span class="" id="Sp2.s18_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1010/noun:common" id="token_86">profile</span> <span class="" value="2020/adj:base" id="token_87">high</span> <span class="" id="token_88">-</span><span class="" value="1013/noun:acronym" id="token_89">o</span> <span class="" value="1013/noun:acronym" id="token_90">Output.h264</span> <span class="" value="1013/noun:acronym" id="token_91">Input.yuv</span></span></div>
<div style><span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1013/noun:acronym"><br></span></span></div>
<div style><span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="1013/noun:acronym">Mainconcept</span> <span class="" value="0404/verb:plain" id="token_92">uses</span> <span class="" value="3c3e/det" id="token_93">a</span> <span class="" value="1010/noun:common" id="token_94">buffer</span> <span class="" value="1010/noun:common" id="token_95">size</span> <span class="" value="5050/prep" id="token_96">of</span> <span class="" value="1013/noun:acronym" id="token_97">3Mbit</span> <span class="" value="5050/prep" id="token_98">for</span> <span class="" value="1013/noun:acronym" id="token_99">HD</span> <span class="" value="1010/noun:common" id="token_100">sequence</span><span class="" id="token_101">,</span> <span class="" value="6465/conj" id="token_102">and</span> <span class="" value="7070/pron" id="token_103">I</span> <span class="" value="0404/verb:plain" id="token_104">choose</span> <span class="" value="3c3d/det" id="token_105">the</span> <span class="" value="1010/noun:common" id="token_106">same size</span> <span class="" value="5050/prep" id="token_108">for</span> <span class="" value="1013/noun:acronym" id="token_109">x264</span> <span class="" value="a86a/part" id="token_110">in order to</span> <span class="" value="5848/verb:inf" id="token_111">have</span> <span class="" value="3c3d/det" id="token_112">the</span> <span class="" value="2829/det" id="token_113">same</span> <span class="" value="1010/noun:common" id="token_114">latency</span><span class="" id="token_115">.</span></span></div>
<div style><span class="" id="Sp2.s19_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="5050/prep" id="token_116">With</span> <span class="" value="2828/det" id="token_117">this</span> <span class="" value="1010/noun:common" id="token_118">buffer</span> <span class="" value="1010/noun:common" id="token_119">size</span><span class="" id="token_120">,</span> <span class="" value="1013/noun:acronym" id="token_121">x264</span> <span class="" value="080b/verb:plain" id="token_122">does</span> <span class="" value="3031/adv" id="token_123">not</span> <span class="" value="0448/verb:plain" id="token_124">succeed</span> <span class="" value="5050/prep" id="token_125">in</span> <span class="" value="4c4c/verb:prespart" id="token_126">achieving</span> <span class="" value="1013/noun:acronym" id="token_127">8Mb/s</span> <span class="" value="6868/conj" id="token_128">but</span> <span class="" value="1013/noun:acronym" id="token_129">6MB/s</span><span class="" id="token_130">.</span></span></div>
<div style><span class="" id="Sp3.s2_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="a86a/part" id="token_1">To</span> <span class="" value="4848/verb:inf" id="token_2">achieve</span> <span class="" value="1013/noun:acronym" id="token_3">8Mb/s</span><span class="" id="token_4">,</span> <span class="" value="7070/pron" id="token_5">I</span> <span class="" value="0808/verb:plain" id="token_6">have to</span> <span class="" value="4848/verb:inf" id="token_7">choose</span> <span class="" value="3c3e/det" id="token_8">a</span> <span class="" value="2021/adj:comparative" id="token_9">bigger</span> <span class="" value="1010/noun:common" id="token_10">buffer</span> <span class="" value="5050/prep" id="token_11">of</span> <span class="" value="1013/noun:acronym" id="token_12">35Mbit</span><span class="" id="token_13">,</span> <span class="" value="6868/conj" id="token_14">but</span> <span class="" value="3030/adv" id="token_15">firstly</span> <span class="" value="7070/pron" id="token_16">I</span> <span class="" value="0404/verb:plain" id="token_17">add</span> <span class="" value="2432/pron" id="token_18">more</span> <span class="" value="6c6c/conj" id="token_19">than</span> <span class="" value="1013/noun:acronym" id="token_20">4sec</span> <span class="" value="5050/prep" id="token_21">of</span> <span class="" value="1010/noun:common" id="token_22">latency</span><span class="" id="token_23">!</span></span><span style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"> </span><span class="" id="Sp3.s3_o" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="" value="6465/conj" id="token_24">And</span> <span class="" value="3030/adv" id="token_25">secondly</span><span class="" id="token_26">,</span> <span class="" value="3c3d/det" id="token_27">the</span> <span class="" value="1010/noun:common" id="token_28">rate</span> <span class="" value="1010/noun:common" id="token_29">control </span><span class="" value="1010/noun:common" id="token_30">needs</span> <span class="" value="2829/det" id="token_31">a lot of</span> <span class="" value="1010/noun:common" id="token_32">frames</span> <span class="" value="a8a8/part" id="token_33">to</span> <span class="" value="4448/verb:inf" id="token_34">be</span> <span class="" value="2020/adj:base" id="token_35">stable, a small number of bits are allocated to the frames at the begining of the sequence</span> <span class="" value="6465/conj" id="token_36">and</span> <span class="" value="3030/adv" id="token_37">consequently</span><span class="" id="token_38">,</span> <span class="" value="3c3d/det" id="token_39">the</span> <span class="" value="1010/noun:common" id="token_40">average</span> <span class="" value="5050/prep" id="token_41">of </span><span class="" value="1013/noun:acronym" id="token_42">PSNR/SSIM</span> <span class="" value="5050/prep" id="token_43">on</span> <span class="" value="3c3d/det" id="token_44">the</span> <span class="" id="token_45">200</span> <span class="" value="1010/noun:common" id="token_46">frames</span> <span class="" value="4004/verb:plain" id="token_47">is</span> <span class="" value="3030/adv" id="token_48">always</span> <span class="" value="2021/adj:comparative" id="token_49">lower</span> <span class="" value="6c6c/conj" id="token_50">than</span> <span class="" value="1011/noun:propernoun" id="token_51">Mainconcept</span><span class="" id="token_52">.</span></span><br>
</div><div style><span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class=""><br></span></span></div><div style>
<span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="">Is there something that I don't understand about x264 ratecontrol which allows to reach the target bitrate and does not need more than 1 GOP to be stable?</span></span></div>
<div style><span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class=""><br></span></span></div><div style>
<span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="">Thanks for your help,</span></span></div><div style>
<span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class=""><br></span></span></div><div style><span class="" style="font-size:13px;color:rgb(0,0,0);font-family:arial,helvetica,'lucida sans','arial unicode ms',code2000,verdana,sans-serif"><span class="">Eloļse</span></span></div>
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