herryever <henry.he <at> noovo.co> writes:

> I'm trying the FFMPEG multi-thread decoding,

The FFmpeg mpegvideo decoder only supports slice 
threading, if your video does not contain more 
than one slice per frame, you will not get any 
performance improvement by using multiple threads.

Patch welcome!

> I'm using the ffmpeg-2.3.1.

Note that generally, on this mailing list only 
current FFmpeg git head is supported.

Carl Eugen

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