http://ffdshow-tryout.sourceforge.net/html/en/faq.htm

Is ffdshow multithreaded?

The following list gives an overview of parts in ffdshow that are multithreaded and thus show an improvement when run on a multi-core CPU:

* The resize filter is fully multithreaded. It is faster on a dual-core CPU. No configuration is needed. It is not effective on Pentium 4 HT CPUs.
* Xvid encoder is multithreaded.
* x264 encoder is multithreaded.
* With "Queue & misc" -> "Queue output samples" checked, acceleration using multithreading is enabled. You may see some benefit even on a single-core CPU.
* libavcodec's MPEG1/2 decoders are multithreaded. It becomes effective when setting "Decoder options" -> "Number of decoding threads" to the number of supported cores. The setting has no effect on Pentium 4 HT CPUs.
* libavcodec's MPEG4/MPEG2/MPEG1 encoders are multithreaded.

.....pokud chceš odlehčit CPU a zrychlit dekodování, rozhodně používej SSE build ffdshow