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<body class='hmmessage'><div dir='ltr'>I appreciate your response Kieran, but the original question is what is the effective "rate control mode" when different combination of these settings is used.<div><br></div><div>Here, let me post again my example again (but more generally I am trying to understand what the effect RC mode will be if any of this is changed):</div><div><br></div><div><div style="font-size: medium;">1st pass:</div><div style="font-size: medium;"><span style="font-size: 11pt;">vbv-bufsize=10000 bitrate=3400 vbv-maxrate=3800 ratetol=0.1 -pass 1</span></div><div style="font-size: medium;"><span style="font-size: 11pt;"><br clear="none"></span></div><div style="font-size: medium;"><span style="font-size: 11pt;">2nd pass:</span></div><div style="font-size: medium;"><span style="font-size: 11pt;">everything same as above with -pass 2</span></div><div style="font-size: medium;"><br clear="none"></div><div style="font-size: medium;"><font color="#1f497d"><span style="font-size: 15px;">Is this going to be be CBR/VBR/ABR? Will if target a fixed file size or bitrate or both?</span></font></div><div><font color="#1f497d"><span style="font-size: 15px;"><br></span></font></div>Thanks,</div><div>-Purvin</div><div><br></div><div><div><hr id="stopSpelling">Date: Mon, 12 May 2014 07:31:50 -0700<br>From: kieran@kunhya.com<br>To: x264-devel@videolan.org<br>Subject: Re: [x264-devel] x264 rc mode settings clarification<br><br><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top"><p dir="ltr">Vbv bufsize is the size of the leaky bucket. Vbv maxrate is the maximum input into said bucket. Leave ratetol alone. Bitrate is the average bitrate across the video.</p>
<p dir="ltr">Sent from my mobile device</p>
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Purvin Pandit <purvinp@hotmail.com>; <br>
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x264-devel@videolan.org <x264-devel@videolan.org>; <br>
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Re: [x264-devel] x264 rc mode settings clarification <br>
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Mon, May 12, 2014 12:48:04 PM <br>
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<td valign="top"><div dir="ltr">Folks,<div><br clear="none"></div><div>Is this a very difficult question or a stupid question? No one on this list has answered it for while now. </div><div><br clear="none"></div><div>x264 is a fantastic piece of work but without understanding what all the different combinations will do its hard to use it. I would like to understand and document (if possible) what all the different combinations of the rate control settings (including VBV settings) do to the final encode.</div><div><br clear="none"></div><div>If someone knows of a place where all the different combinations of bitrate, max-bitrate, vbv-bufsize, vbv-maxrate, ratetol, pass, crf, vbv-init, crf-max are documented please let me know.</div><div><br clear="none"></div><div>Thanks,</div><div>-Purvin</div><div><br clear="none"><div><hr id="ecxstopSpelling">From: purvinp@hotmail.com<br clear="none">To: x264-devel@videolan.org<br clear="none">Date: Fri, 9 May 2014 07:56:21 -0400<br clear="none">Subject: Re: [x264-devel] x264 rc mode settings clarification<br clear="none"><br clear="none">
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<div class="ecxyqt7545476605" id="ecxyqt26204"><div dir="ltr"><div>Reposting....</div><div><br clear="none"></div><div><br clear="none">
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<div dir="ltr">Hi<div><br clear="none"></div><div>I have a question about the rate control settings in x264. What is the implication of using the following settings?</div><div><br clear="none"></div><div>1st pass:</div><div><span style="font-size:11.0pt;">vbv-bufsize=10000 bitrate=3400 vbv-maxrate=3800 ratetol=0.1 -pass 1</span></div><div><span style="font-size:11.0pt;"><br clear="none"></span></div><div><span style="font-size:11.0pt;">2nd pass:</span></div><div><span style="font-size:11.0pt;">everything same as above with -pass 2</span></div><div><br clear="none"></div><div><font color="#1f497d"><span style="font-size:15px;">Is this going to be be CBR/VBR/ABR? Will if target a fixed file size or bitrate or both?</span></font></div><div><font color="#1f497d"><span style="font-size:15px;"><br clear="none"></span></font></div><div><font color="#1f497d"><span style="font-size:15px;">Thanks I am just trying to get all the different parameters sorted
out.</span></font></div><div><font color="#1f497d"><span style="font-size:15px;"><br clear="none"></span></font></div><div><font color="#1f497d"><span style="font-size:15px;">Thanks,</span></font></div><div><font color="#1f497d"><span style="font-size:15px;">-Purvin</span></font></div> </div>
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