[mythtv-users] Hardware resrouces required for s/w encode
james at ultratans.com
Thu Feb 4 14:23:35 UTC 2010
> Since I've got a 2.3GHz X4 CPU, I'm assuming that s/w MPEG-4 (or
> RTjpeg) encode can easily be taken care of by the CPU.
> Am I correct? Or have I overlooked something?
> I'm also assuming that the GHz performance of a single core is not the
> determining factor in whether or not s/w encode is possible, and that
> codecs are multi-threaded to share the load across cores. If not, I'm
> concerned (given Hauppauge's min. requirement of a 3GHz P4) that a
> single 2.3GHz core won't be man enough for the job.
I don't know about the HVR-4000, but if it lacks HW mpeg2 encoding chips
then you will need software encoding for the analog inputs (composite,
RF or coax, etc). I have two analog software encoders on my Myth setup.
Under Mythbuntu 9.04/Myth 0.21 I was able to use RTjpeg. With Mythbuntu
9.10/Myth 0.22 I am unable to use RTjpeg and can only use MPEG4. For me
RTJpeg gave a slightly better picture in the finished recording. I am
now using MPEG4 with the high quality options turned on, bitrate of
3200, and the Max Quality settings at 1. This is the best I have found
for my setup with MPEG4. The picture is a little softer (i.e. slightly
blurred) than the picture I got with RTJpeg, but the best I can
I have a Phenom II x4 3.0 GHz. A single software encoding takes
approximately 30% of one core. Your 2.3 GHz Athlon should have no
problem with software encoding. I have no proof, but I would think a
modern Athlon would soundly beat a P4 on a clock per clock comparison.
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