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• Unknown input format : 'x11grab'

  5 juillet 2017, par jjh

  guys :

  I have problems when i compile ffmpeg and run ffmpeg in linux.

  My environment :

  1 : ubuntu 17.10_x64_bit(i don’t think the os version is the key)

  2 : gcc (Ubuntu 6.3.0-19ubuntu1) 6.3.0 20170618

  3 : ffmpeg open source code:3.2

  first, i download the source code from ffmpeg official site. I compile this project with there instructions：

  ./configure --prefix=/home/jjh/software/ffmpeg --enable-shared
  
  make
  
  make install

  and it worked without any error except some warning, then i run :

  ./ffmpeg -h

  i make sure that it works and output normally.

  but i want use ffmpeg to grabbing screen. so i use this construction(o) :

  ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg

  then output error :

  Unknown input format: 'x11grab'

  i want to re-compile this project with —enable-x11grab option, btw , so many solution tell me to to this. but when i add this option, i get some errors :

  Invalid option --enable-x11grab

  some people says that i should install some libs :

  libxfixes-dev
  
  sudo apt-get install libxext-dev

  so i installed these libs, but it always show this error. pls help me.

• How to limit FFMpeg CPU usage ? Threads ? [closed]

  6 mai 2013, par forg4t

  I read lot of forum comment how to limit ffmpeg cpu... many people wrote to use this formula : nice -n 10 or 20 it's ok. But I don't know what number should be use in ffmpeg threads ? 0 or 1, 2, 3 I don't know. I would really appreciate your help !

  I checked the system data :

  server : # lscpu
  Architecture : x86_64
  CPU op-mode(s) : 32-bit, 64-bit
  Byte Order : Little Endian
  CPU(s) : 2
  On-line CPU(s) list : 0,1
  Thread(s) per core : 1
  Core(s) per socket : 2
  Socket(s) : 1
  NUMA node(s) : 1
  Vendor ID : GenuineIntel
  CPU family : 6
  Model : 37
  Stepping : 1
  CPU MHz : 3066.775
  BogoMIPS : 6133.55
  Hypervisor vendor : VMware
  Virtualization type : full
  L1d cache : 32K
  L1i cache : 32K
  L2 cache : 256K
  L3 cache : 12288K
  NUMA node0 CPU(s) : 0,1
  

  server : # less /proc/cpuinfo
  processor : 0
  vendor_id : GenuineIntel
  cpu family : 6
  model : 37
  model name : Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
  stepping : 1
  microcode : 0x15
  cpu MHz : 3066.775
  cache size : 12288 KB
  physical id : 0
  siblings : 2
  core id : 0
  cpu cores : 2
  apicid : 0
  initial apicid : 0
  fpu : yes
  fpu_exception : yes
  cpuid level : 11
  wp : yes
  

• How do you set up carrierwave-video with ffmpeg ?

  24 septembre 2013, par Maleckai

  This has been doing my head in for the past 2 days, and I just cannot seem to get it working.

  I am building a simple Rails app with the sole purpose of uploading & processing images and videos. I'm working on Ubuntu Linux.

  Here's the relevant gems in my Gemfile :

  gem 'delayed_job_active_record'
  
  gem 'carrierwave'
  
  gem 'carrierwave-video'
  
  gem 'carrierwave_backgrounder'
  
  gem 'mini_magick'
  
  gem 'streamio-ffmpeg'

  At first I was having problems with ffmpeg complaining about certain arguments (I determined this by taking the command the rails app attempted to run when it was to convert a video, and running it manually outside rails), which I discovered was because the version of ffmpeg I was using was 'too new'. So I downgraded to 1.2.1, which is what streamio-ffmpeg says is the only version of ffmpeg they're tested against.

  After that, I could run the command manually, fine. But whenever I tried to convert through the app, I'd get the error :

  Failed to transcode with FFmpeg. Check ffmpeg install and verify video is not corrupt or cut short. Original error: nil is not a symbol

  I did a bit of Googling on the error, and only came up with one relevant result, but nothing in there has helped my situation.

  I'm at a total loss at this point, and am not sure where I can go from here. I assume many of people have tried this before, so I'm hoping someone can guide me on the exact steps they took to get carrierwave-video & ffmpeg working together.