Re: [FFmpeg-user] -threads option has no effect

[Claudiu Rad-Lohanel]

On 8/12/2014 1:56 PM, Rohit Talwar wrote:
Hi
Thanks for looking into my query. I have a main java program within which I
run ffmpeg (using exec). Often there comes a scenario wherein my program
needs to create 4+ different instances of ffmpeg program for converting
files into different formats. When this happens the cpu gets 'too busy'
running the ffmpeg instances which affects the performance of my java
program.
I think lowering the priority(using nice or start /LOW )  of the ffmpeg
process might be a possible strategy to solve this, but would be glad if
you can help me point towards a platform independent solution.



On Tue, Aug 12, 2014 at 3:39 PM, James Darnley <james.darn...@gmail.com>
wrote:

On 2014-08-12 11:59, Rohit Talwar wrote:
Hi

I ran the command - ffmpeg -threads <number of threads> -i <my file.avi>
Perhaps you should not be using it as an input option.

or to expand this a bit for regular people that don't understand that 
order matters:
try to put threads option AFTER the input file, because most options 
apply to the next input/output file in the command line, like this:

ffmpeg -i <my file.avi> -threads <number of threads> ... <output>

don't know if it would do the job for you but it should.
also, lowering process priority and letting ffmpeg use all available 
resources would be my recommendation for maximum performance in all cases.


<target.mp4> hoping it would not hog my cpu and consume only one core of
my
machine. But it was still taking up all of my cpu. I ran the following
experiments to confirm my suspicion that including the -threads option
has
no effect on cpu usage.
Why do you not want it to use as much CPU as it can?  If this is a
desktop that you are using at the same time you should lower the
priority of the ffmpeg process.



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