Hi guys, I have been recoding the bit-rate information of one video content for a week. This system used the variable bit-rate which varied as the complexity of video picture (eg. fast-moving picture requires higher bit-rate). I would like to determine the optimal bit-rate from this one-week information, do you have any efficient model beside using density estimation (plotting data histogram)?

# Optimal bit-rate

Started by ●July 22, 2008

Posted by ●July 22, 2008

pawinll wrote:> Hi guys, > > I have been recoding the bit-rate information of one video content > for a week. This system used the variable bit-rate which varied as the > complexity of video picture (eg. fast-moving picture requires higher > bit-rate). I would like to determine the optimal bit-rate from this > one-week information, do you have any efficient model beside using density > estimation (plotting data histogram)?If the content is typical, just compute bits per week and divide to get any interval you want (bits/day. bits/sec, etc.). Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������

Posted by ●July 22, 2008

On Jul 22, 10:33 am, Jerry Avins <j...@ieee.org> wrote:> pawinll wrote: > > Hi guys, > > > I have been recoding the bit-rate information of one video content > > for a week. This system used the variable bit-rate which varied as the > > complexity of video picture (eg. fast-moving picture requires higher > > bit-rate). I would like to determine the optimal bit-rate from this > > one-week information, do you have any efficient model beside using density > > estimation (plotting data histogram)? > > If the content is typical, just compute bits per week and divide to get > any interval you want (bits/day. bits/sec, etc.). > > JerryOne thing to keep in mind is that allowed decoding latency, which the original poster didn't state. I wonder if the question really was, "If I were to re-encode the entire steam (over the entire week) and decode the entire stream all at once, what is the optimal bit rate?"

Posted by ●July 22, 2008

julius wrote:> On Jul 22, 10:33 am, Jerry Avins <j...@ieee.org> wrote: >> pawinll wrote: >>> Hi guys, >>> I have been recoding the bit-rate information of one video content >>> for a week. This system used the variable bit-rate which varied as the >>> complexity of video picture (eg. fast-moving picture requires higher >>> bit-rate). I would like to determine the optimal bit-rate from this >>> one-week information, do you have any efficient model beside using density >>> estimation (plotting data histogram)? >> If the content is typical, just compute bits per week and divide to get >> any interval you want (bits/day. bits/sec, etc.). >> >> Jerry > > One thing to keep in mind is that allowed decoding latency, which > the original poster didn't state. I wonder if the question really > was, > "If I were to re-encode the entire steam (over the entire week) and > decode the entire stream all at once, what is the optimal bit rate?"Latency in TV iOne can allow for it if the worst case is known. The latency of my cable box is a few hundred ms. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������

Posted by ●July 23, 2008

Jerry Avins wrote:> julius wrote: >> On Jul 22, 10:33 am, Jerry Avins <j...@ieee.org> wrote: >>> pawinll wrote: >>>> Hi guys, >>>> I have been recoding the bit-rate information of one video >>>> content >>>> for a week. This system used the variable bit-rate which varied as the >>>> complexity of video picture (eg. fast-moving picture requires higher >>>> bit-rate). I would like to determine the optimal bit-rate from this >>>> one-week information, do you have any efficient model beside using >>>> density >>>> estimation (plotting data histogram)? >>> If the content is typical, just compute bits per week and divide to get >>> any interval you want (bits/day. bits/sec, etc.). >>> >>> Jerry >> >> One thing to keep in mind is that allowed decoding latency, which >> the original poster didn't state. I wonder if the question really >> was, >> "If I were to re-encode the entire steam (over the entire week) and >> decode the entire stream all at once, what is the optimal bit rate?" > > Latency in TV iOne can allow for it if the worst case is known. The > latency of my cable box is a few hundred ms.Text got lost: Latency in TV isn't much harder to deal with than latency in recordings. One can allow for it if the worst case is known. The latency of my cable box is a few hundred ms. Correction: I can't prove more than about 100 ms in the box itself. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������

Posted by ●July 23, 2008

julius wrote:> On Jul 22, 10:33 am, Jerry Avins <j...@ieee.org> wrote: > >>pawinll wrote: >> >>>Hi guys, >> >>> I have been recoding the bit-rate information of one video content >>>for a week. This system used the variable bit-rate which varied as the >>>complexity of video picture (eg. fast-moving picture requires higher >>>bit-rate). I would like to determine the optimal bit-rate from this >>>one-week information, do you have any efficient model beside using density >>>estimation (plotting data histogram)? >> >>If the content is typical, just compute bits per week and divide to get >>any interval you want (bits/day. bits/sec, etc.). >> >>Jerry > > > One thing to keep in mind is that allowed decoding latency, which > the original poster didn't state. I wonder if the question really > was, > "If I were to re-encode the entire steam (over the entire week) and > decode the entire stream all at once, what is the optimal bit rate?"There is one more thing to consider: the video compression schemes often use a bit reservoir of several hundred kilobytes or so. This reservoir is slowly filled during the normal operation and emptied in the cases of the peak demand. The operation of this reservoir is more involved then a simple buffer; it is controlled from the transmitter side. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com

Posted by ●July 23, 2008

On Jul 22, 11:01 pm, Jerry Avins <j...@ieee.org> wrote:> > >> One thing to keep in mind is that allowed decoding latency, which > >> the original poster didn't state. I wonder if the question really > >> was, > >> "If I were to re-encode the entire steam (over the entire week) and > >> decode the entire stream all at once, what is the optimal bit rate?" > > > Latency in TV iOne can allow for it if the worst case is known. The > > latency of my cable box is a few hundred ms. > > Text got lost: > Latency in TV isn't much harder to deal with than latency in recordings. > One can allow for it if the worst case is known. The latency of my cable > box is a few hundred ms. > > Correction: I can't prove more than about 100 ms in the box itself. > > JerryWhat I referred to was latency in terms of encoding and decoding block lengths, not in signal propagation ... Julius