FFmpeg single thread/process

[voisin-it 0]

Hello,

 

I'm using Debian 8, 4c/8t processor xeon, Emby 3.2.33.0, mono-complete 5.2.0.224-0xamarin7+debian8b1, ffmpeg 3.2.5-1~bpo8+1

 

I have a performance problem.

 

After installing the emby server, the first play video happens very well and I have a lot of ffmpeg processes and all CPU threads (8) are used.

 

But soon, the other reads only start a single ffmpeg process and a single CPU thread.

So performance is limited and I have jerks

 

I have reinstalled several times my system, ffmpeg (multimedia repositories or Debian repositories) in different versions but ffmpeg always ended up running in mono process and mono thread.

 

A track?

Thank you

 

 

ffmpeg-remux-7eef8f9f-0544-4d32-89de-d9cb9c5c2c0b.txt

server-63643500657.txt

Edited October 13, 2017 by voisin-it

[Luke 42078]

Hi, how are you determining this? I see -threads 0 in the log. Can you try updating your installed ffmpeg? Thanks.

[voisin-it 0]

Hi,

 

I see it with the htop command, ffmpeg uses a single thread.

I have tested ffmpeg from official debian repositories and Multimedia..

How to upgrade ffmpeg?

Compiling from trac.ffmpeg.org ?

 

 

In fact, even after the transcoding is complete, the video blocks and resumes variably while the entire processor is only 10%

[voisin-it 0]

I have also tested several configurations in the tab trancadage, but I have the impression that it has no effect

[voisin-it 0]

See the screenshot attached, this is the same video but the server does not execute the same command.

 

 

"ffmpeg -noaccurate_seek" when it is in single thread

 

 

[Luke 42078]

That command is used depending on the input container, nothing to do with thread count.

[voisin-it 0]

Okay

 

In the Transacoding menu, "Number of transcoding threads: auto, max or 8" has no effect.

 

Do you have any idea about my performance problem, even after the trancodage is finished?

[Luke 42078]

Yes that setting does have effect, notice the

 

-threads xxx parameter

[Luke 42078]

I would suggest trying this version of the server here:

 

https://emby.media/community/index.php?/topic/50012-emby-server-for-net-core/page-1

 

It is a whole new installation. Thanks.

[voisin-it 0]

Thanks, I look and test