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  • ffmpeg not using all cores

    4 novembre 2013, par kkgzjjmj

    I just got my new server with two intel e5-2695 but I was shocked to see that ffmpeg or ubuntu doesn't utilize all cores.

    top while ffmpeg was running

    top - 23:35:25 up  2:41,  2 users,  load average: 5.35, 4.37, 3.12
Tasks: 333 total,   2 running, 331 sleeping,   0 stopped,   0 zombie
%Cpu0  :  0.0 us,  1.0 sy, 35.6 ni, 63.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  :  0.0 us,  0.7 sy, 35.5 ni, 63.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us,  0.7 sy, 33.4 ni, 65.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.0 us,  0.0 sy, 32.7 ni, 67.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu4  :  0.0 us,  0.3 sy, 32.3 ni, 67.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu5  :  0.0 us,  0.3 sy, 33.0 ni, 66.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu6  :  0.0 us,  0.0 sy, 32.6 ni, 67.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu7  :  0.0 us,  0.3 sy, 32.7 ni, 67.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu8  :  0.0 us,  0.7 sy, 32.6 ni, 66.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu9  :  0.0 us,  0.3 sy, 33.9 ni, 65.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu10 :  0.0 us,  0.0 sy, 35.0 ni, 65.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu11 :  0.0 us,  0.7 sy, 30.0 ni, 69.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu12 : 21.1 us,  0.0 sy,  0.0 ni, 78.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu13 :  0.7 us,  0.0 sy,  4.3 ni, 95.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu14 :  0.3 us,  0.0 sy,  5.0 ni, 94.6 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu15 : 24.9 us,  0.0 sy,  0.0 ni, 75.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu16 :  0.3 us,  0.0 sy,  3.7 ni, 96.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu17 :  0.7 us,  0.3 sy,  4.9 ni, 94.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu18 :  1.0 us,  0.0 sy,  4.6 ni, 94.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu19 :  0.7 us,  0.0 sy,  4.7 ni, 94.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu20 : 11.1 us,  0.0 sy,  0.0 ni, 88.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu21 :  1.3 us,  0.0 sy,  4.6 ni, 94.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu22 :  2.0 us,  0.3 sy,  4.3 ni, 93.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu23 : 96.7 us,  1.0 sy,  0.0 ni,  2.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu24 :  0.0 us,  0.0 sy,  0.7 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu25 :  0.0 us,  0.0 sy,  3.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu26 :  0.0 us,  0.0 sy,  1.3 ni, 98.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu27 :  0.0 us,  0.0 sy,  4.0 ni, 96.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu28 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu29 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu30 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu31 :  0.0 us,  0.0 sy,  1.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu32 :  0.0 us,  0.0 sy,  0.7 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu33 :  0.0 us,  0.0 sy,  1.7 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu34 :  0.0 us,  0.0 sy,  2.0 ni, 98.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu35 :  0.0 us,  0.0 sy,  1.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu36 :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

    ffmpeg was sent with -threads 0

    *I also tried sending ffmoeg with -threads 500- no difference

    OS: Ubuntu Server 12.04.3 LTS

  • Alternative to ffmpeg for dynamically creating video thumbnails

    3 novembre 2013, par user763852

    The server hosting my website doesn't have ffmpeg and I am not allowed to install any additional extensions. Is there any other way I can make video thumbnails dynamically? Perhaps some kind of web service, where I pass the video file and as a result I get a picture file. I'm using php, by the way.

  • How do you enable "veryfast" libx264 preset from code using libavcodec ?

    3 novembre 2013, par dicroce

    I'm using libx264 via ffmpeg (in a C++ program), and I need to know how to activate the "veryfast" preset. A grep in the x264 source tree yields:

    include/x264.h:static const char * const x264_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo", 0 };

    Which inclines me to believe that x264 itself supports this preset as opposed to just being implemented in ffmpeg as a collection of other settings. So, the question is: How do I get ffmpeg to activate the x264 "veryfast" preset?

  • avisynth AverageLuma() function equivalent in ffmpeg libraries ?

    3 novembre 2013, par KG6ZVP

    I am working on implementing some software to analyze videos and would like to transition the project from avisynth to libavformat/libavcodec.

    The Problem: I would like to seek through every frame in a given input video, detect black frames and write that list to a file. Is there a function which would allow me to get the light level of the current frame? I realize that I may have to implement such a function myself, but as of now, I don't even know where I could collect the information on individual pixels in each frame to start that analysis. Help is greatly appreciated!

  • How to extract timestamp and subtitles which stored in SEI with ffmpeg [on hold]

    3 novembre 2013, par Vito

    I want to extract timestamp and subtitles from a mp4 file,is there any good suggestion？

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