How can improve speed of ffmpeg encoding?

[marcorocchini]

Hi cats

please I wonder if is there a way to improve speed of encoding dunrig the ffmpeg encoding process

I have a HP envy J113 EL pc

windows 10 64 bit

ffmpeg 64 bit

During encoding I need to deinterlace, but speed is "only" 9 fps

[Baldrick]

You could try add "-preset ultrafast"

But you will probably get a bigger output file size then.

[SameSelf]

Deinterlacing is notoriously hard to do especially on HD content. You have a choice, you can either 1) bite the bullet, so the results look satisfying or 2) let time become the driver and start relaxing the settings as Baldrick suggests. IOW, you are getting nearly 10 fps, which ain't bad imho.

Given that you have raw HD content, it sounds like quality is important to you. Therefore, may I suggest a third option? If you are going to be doing a lot of deinterlacing, I suggest QTGMC. While yadif is good, QTGMC is arguably better. And more importantly, QTGMC has a very good multi-thread version that, when properly optimized for your cpu, should speed up your encodes without sacrificing quality and possibly even improving the results. You will need Avisynth to run QTGMC, but the wiki page is very good. Once you build your Avisynth script, you can simply set the avs file as your ffmpeg input.

http://avisynth.nl/index.php/QTGMC

[pandy]

Provide full command line (ok - i see - yadif is fast itself and it should not produce high load), you can try use more cores (check syntax for x264 to control multithreading) - slices can be useful, reducing/using less complex preset as suggested by Baldrick can be helpful also.
Side to this i would check power management options and ho good is cooling in your PC - i can have faster encoding on my notebook ancient core duo... seem you may have problems with computer itself visible as performance drop during intense workload.
You may try to force ffmpeg to use more threads by adding to ffmpeg: ffmpeg.exe -threads %NUMBER_OF_PROCESSORS%*1.5 .
Finally you may try to use hardware decoding.
Btw perhaps your HDD is not capable to feed ffmpeg sufficiently fast?
You can try to pipe from ffmpeg to ffmpeg - (one decoding, second encoding) - this may also be better with higher number of cores/threads.