[MEncoder-users] Performance on multi core machines - a specific enquiry re avisynth mt input

[James Hastings-Trew]

Michael Rozdoba wrote:
> James Hastings-Trew wrote:
>   
>> Michael Rozdoba wrote:
>>     
>>> Aside: How would I replicate the avisynth script I posted using just 
>>> MEncoder?
>>>
>>> Thanks for the feedback
>>>       
>> Honestly, I don't know what half of that stuff in the AVISynth script is 
>> about, but there is a comment line in there about cleaning up a 
>> "blocky/noisy" mpeg2 source. That sounds like a job for the hqdn3d 
>> filter (high quality denoise 3d). This filters image noise in both 
>> spacial and temporal domains. There are also horizontal and vertical 
>> deblocking filters (pp=hb,pp=vb). pp=de will give you a default 
>> deblock/dering filter set.
>>     
>
> I'll add looking  into that to my todo list.
>
>   
>> I've no idea what kind of output file you are trying to create, so this 
>> example just uses default settings for lavc encoders. You can get much 
>> better results by reading the manual and following the examples. (for 
>> example, by specifying the codecs you want to use, codec options to 
>> optimize size/quality how many CPU threads to use, etc.):
>>
>> mencoder INPUT -vf pp=de,hqdn3d -oac lavc -ovc lavc -ffourcc DIVX -of 
>> avi -o OUTPUT
>>     
>
> Thanks, but it's only a temporary file using a lossless codec that I 
> need at that point. The purpose of the encode is purely to allow the 
> avisynth script to do its stuff & only have to do so once. Without this 
> pre-rendering the subsequent x264 encode, as it uses two passes, would 
> require the avisynth processing be performed twice on the original 
> source, one for each pass.
>
> Can anyone comment on why avisynth is being restricted to one core 
> /only/ when it's being used as input to mencoder?
>
> I could really use a solution as I've just discovered my alternative 
> solution - vdub & ffdshow's huffy, is introducing a yellow colour cast 
> (probably as it requires an additional converttorgb step at the end of 
> the avisynth script, as vdub will only accept rgb).
>
> If no one here knows, any suggestions where I could ask? The issue does 
> seem to be specific to mencoder.
>
>   
I think you are missing the point... you don't need to do the 
intermediate file, avisynth script, or anything like that. Just do it 
all in MEncoder. All that other software and extra steps are 
unnecessary, and only making the process slower in the long run than 
worrying about processing the image on each pass.