No means to specify how many threads to start about winff HOT 6 CLOSED

it's an ffmpeg limitation. There is only "-threads 2". And that's it.

Actually, it seems that it is possible to run ffmpeg with -threads 4 and with
-threads 8 also.  See this thread -
http://ubuntuforums.org/archive/index.php/t-783185.html

Apparently, according to the mail-list at ffmpeg upstream [1], ffmpeg can use 
as many
threads as you want, but this requires that the video codec that you select has
multithreading capabilities. For example in H.264 decoder you can
decode with multiple threads if the input video has slices. Also ffmpeg needs
threading compiled in, but it already needs that for 2 threads.

[1] https://lists.mplayerhq.hu/pipermail/ffmpeg-user/2008-February/014256.html

Yes they have finally upgraded it. They went to -threads auto, which didn't 
work at
all and then they went back to -threads 2 only. Now it can be specified, but 
still
not all codecs support multithread yet. I will add it in the preferences in the 
next
version or two.

The libx264 encoder allows you to use "-threads 0".  This will automatically 
select
the appropriate number of threads.  Other encoders that support threads need 
the user
to specify the number of threads.

added a edit box to specify number of threads. Will come out with next release