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<blockquote data-quote="j1nx" data-source="post: 688283" data-attributes="member: 13808">That the playback starts an X amount of second before the END of the buffer is handled by the SmoothStreaming module. &quot;?dvr_window_length=15&quot; &lt;- This variable is handling that. It is set to 15 seconds, so it is still strange that it start at 5 seconds before the end.About the&nbsp; bitrate. I already mentioned somewhere, the H264 is actually a variable bitrate codec, hence most of the parameters set in the preset file are about the &quot;margin&quot; of quality. (while testing, the output of ffmpeg is written in the apache log, for fun start changing the &quot;Q_min&quot; parameter)Anyway, the &quot;min&quot;,&quot;max&quot; and &quot;buffer&quot; will kind of forces it within a window, but still it does not comply with the &quot;-b&quot; parameter.I am in Qatar on a offshore job at the moment. Still trying to write down my observations from the last couple of weeks, explaining most of the parameters and all. I am lacking some proper amount of time at the moment.</blockquote>

[QUOTE="j1nx, post: 688283, member: 13808"] That the playback starts an X amount of second before the END of the buffer is handled by the SmoothStreaming module. "?dvr_window_length=15" <- This variable is handling that. It is set to 15 seconds, so it is still strange that it start at 5 seconds before the end. About the bitrate. I already mentioned somewhere, the H264 is actually a variable bitrate codec, hence most of the parameters set in the preset file are about the "margin" of quality. (while testing, the output of ffmpeg is written in the apache log, for fun start changing the "Q_min" parameter) Anyway, the "min","max" and "buffer" will kind of forces it within a window, but still it does not comply with the "-b" parameter. I am in Qatar on a offshore job at the moment. Still trying to write down my observations from the last couple of weeks, explaining most of the parameters and all. I am lacking some proper amount of time at the moment. [/QUOTE]

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