I've found that's true particularly with fast encodes, but not 
necessarily with a slower encode speed (high quality setting). From what 
I've read in the past, ffmpeg and encoders have developed enough that 
multithreading doesn't make a significant impact on quality anymore. 
This is, of course, from the ffmpeg command line interface rather than 
blender's GUI. I know of no such options within blender, so it's kind of 
moot anyway. If you want a high quality file, you'd encode slowly, 
regardless of the number of threads.

On 05/21/2015 05:00 AM, Troy Sobotka wrote:
> It is also worth noting that some encoding schemas will see a degradation
> in quality when encoding across threads.
>
> With respect,
> TJS
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-- 
Jeffrey "Italic_" Hoover

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