[linux-dvb] DVB API update

Johannes Stezenbach js at linuxtv.org
Tue Sep 18 01:29:51 CEST 2007


On Tue, Sep 18, 2007 at 02:50:09AM +0400, Manu Abraham wrote:
> Johannes Stezenbach wrote:
> 
> >> If you would like to fix that in V3, i would much appreciate. If you
> >> would just like to keep talking only, maybe lets then not talk too much
> >> about it.
> > 
> > The recording filters are exactly the piece from V4 which has the
> > "mmap DMA buffers" zero copy API. But to be honest, I don't think
> > it's important on a PC which can copy > 1GByte/s in RAM. More
> > interesting would be the ability to have multiple independant filtered
> > TS outputs instead of just one dvr device.
> 
> Currently have you tried playing back a High Bit rate H.264 stream
> default of a DVB-S2 stream ? I guess not.
> 
> If you have had, you will see my reasons why i am trying to optimize the
> overheads.
> BTW: it is not RAM that matters here, but CPU horsepower

A demux doesn't decode, and what matters is memory bandwidth.

Johannes



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