[XviD-devel] Non-deterministic encoding

[Dark Sylinc]

Like suggested:

> >> The only time I've heard of issues like this has
> to
> >> do with the floating
> >> point unit using 16 extra bits for accuracy which
> >> aren't preserved across
> >> context switches.  Also, don't the SSE2 (...)

What's the proccesor family steppíng etc?
And more importantly:
Were all using the same OS with the same SPs (if
you're using linux, then the same distro and kernel
version)?
Another reason could be faulty HDD. (but I don't think
so since you said ff was working fine)
It could be a context switching bug, either caused by
the cpu or the OS (or a buggy/malware background
program that is causing trouble).
Other than that, I don't know.

Dark Sylinc

--- Matthew Kwan <matt_kwan at yahoo.com.au> escribió:

> Just tried it on the firewall machine and the live
> machine - and got identical output both times.
> So it looks like it's a problem with the dev
> machine. I'm guessing it's something obscure in the
> FPU - faulty RAM would cause other problems.
> 
> But thanks for helping me isolate this. As long as
> it works properly on the live machine it's not
> really an issue.
> 
> Regards,
> 
> 
> mkwan
> 
> 
> ----- Original Message ----
> From: Michael Militzer <michael at xvid.org>
> To: xvid-devel at xvid.org
> Sent: Friday, 28 December, 2007 9:33:43 PM
> Subject: Re: [XviD-devel] Non-deterministic encoding
> 
> Hi,
> 
> Xvid normally produces identical results when
> encoding with same input
>  and
> same settings. So the 'non-deterministic encoding'
> is not at all a
>  known
> 'feature'.
> 
> Have you considered a hardware fault? Maybe you have
> some bad RAM? Have
> you tried running your transcoding task on another
> machine with same
>  input
> and settings? Do you then still see the
> non-deterministic behavior?
> 
> Regards,
> Michael
> 
> 
> Quoting Matthew Kwan <matt_kwan at yahoo.com.au>:
> 
> > Set xvid_enc_frame_t->vop_flags, vol_flags, and
> motion all to zero,  
>  
> > and set xvid_gbl_init_t->cpu_flags to
> XVID_CPU_FORCE. Still getting  
>  
> > P-frames of differing sizes from identical images
> and quant values,  
>  
> > usually starting over a hundred frames into the
> clip.
> >
> > The machine is a single-core x86, and I've written
> a checksum   
> > function to ensure the input images are in fact
> identical each time.
> >
> > The suggestions so far have been good, but no luck
> so far.
> >
> > Regards,
> >
> >
> > mkwan
> >
> > ----- Original Message ----
> > From: Dark Sylinc <dark_sylinc at yahoo.com.ar>
> > To: xvid-devel at xvid.org
> > Sent: Thursday, 27 December, 2007 4:48:11 PM
> > Subject: Re: [XviD-devel] Non-deterministic
> encoding
> >
> > Hi,
> >
> > Is XviD still non-deterministic with all
> optimizations
> > off?
> >
> > Cheers
> > Dark Sylinc
> >
> > --- "Keith R. Brafford" <keith.brafford at gmail.com>
> > escribió:
> >
> >> The only time I've heard of issues like this has
> to
> >> do with the floating
> >> point unit using 16 extra bits for accuracy which
> >> aren't preserved across
> >> context switches.  Also, don't the SSE2
> extensions
> >> alias on the floating
> >> point registers?  Does that have an impact?
> >>
> >> As a test in the off-chance that this is your
> >> problem (which I doubt), can
> >> you run a test on a relatively unloaded dual-core
> >> machine and set processor
> >> affinity to one core?  If that gives different
> >> results than you are seeing,
> >> then that should be telling.
> >>
> >> --Keith
> >> _______________________________________________
> >> XviD-devel mailing list
> >> XviD-devel at xvid.org
> >> http://list.xvid.org/mailman/listinfo/xvid-devel
> >>
> >
> >
> >
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> > XviD-devel at xvid.org
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> >
> >
> >
> >
> >
> >      
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> >
> 
> 
> 
> 
> 
> 
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