Parallel video encoding
orion at parsed.net
Thu Aug 30 18:48:11 BST 2007
Kristian Erik Hermansen wrote, on Aug 30, 2007 at 12:19 EDT:
> Let's say I have a box with a multitude of CPU cores on multiple
> physical CPUs and i wanted to utilize mencoder to gain maximal total
> CPU usage. Any ideas? I am not sure that mencoder is fully
> multi-threaded, and even if so, it can only run on one physical CPU at
> a time, right?
> $ time $(for i in $(find . -type f | grep -i foo); do mencoder "$i"; done)
> Can you think of a way to make this exec all in parallel, and if so,
> and even so, would this not be efficient to do because of some
> fundamental issue? For instance, how would this affect caching in the
> CPUs? Considering you know the application is a video encoder, what
> properties can we exploit to gain the fastest CPU time to encode all
> the videos? Let's say it is an arbitrary amount, but more than the
> number of cores you have. This is an interesting problem and I should
> probably ask Pixar :-) But you guys are a cheap start!
> Kristian Erik Hermansen
If you use the libavcodec family, it is apparantly threaded. From
Also, if you wanted to use 2-pass encoding, there ought to be something
you can do with that, as well.
34 Wayne Ave, Dudley, MA home:  943 - 7974
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