DVB - was (RE: [mythtv-users] Re: ATI 3D Rage II+ GTB (GFX) w/ AIW 7500 (Tuner))

[Edward Wildgoose]

Ken VanDine wrote:
> With the identical settings I get dropped frames on my P4 1.5Ghz box at 
> 480x480.  It looks great if I use 352x480, but still uses about 65% CPU. 
> I have:
> 
> P4/1.5Ghz
> 1G RAM
> DMA set on hard drives
> WinTV Go
> Nvidia Geforce 4 440MX
> Myth CVS as of yesterday afternoon (same issue with stable release)
> 
> Anyone have any suggestions?

Yes. Set maxquality to 2 and minquality 15. These are
aritficial limits to tell the the encoder when things
are temporarily out of bounds and to do somethng desprate.
It is raising the bitrate that will actually imporve the
quality, not simply forcing the limits.

Leading up to the 0.8 release, it was found that distorting
these parameters is a contributing factor in creating damaged
files that cause bizarre behavior during playback. The values
suggested here are absurd and I assumed were a typo. If these
are his settings (or even if min and max are reversed), this
may be a cause of problems with finding keyframes that he
reports in another thread.

At quality limits 2,15,3 using a Duron 1.3MHz CPU, I can
record a clean signal at 720x480 mpeg4, 5500 scaled bitrate
and have an average of 17% idle CPU during recordonly and have
virtually no frame drops. However, I normally record 544x480,
4400 which looks nearly as good but saves a lot of disk space.
Even 352x480, 3300 looks okay and uses much less than 1GB per
hour.

--  bjm

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