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• Installing FAAC on linux, getting errors

  18 août 2014, par Kyle Monti

  I am trying to install FAAC on linux. I’m getting errors.

  I use this to install.

  cd /usr/src
  
  wget http://sourceforge.net/projects/faac/files/faac-src/faac-1.28/faac-1.28.tar.bz2/download
  
  tar -xvjf faac-1.28.tar.bz2
  
  cd faac-1.28
  
  ./configure
  
  make
  
  make install

  Once I try to make it, I get the error

  mpeg4ip.h:126: error: new declaration ‘char* strcasestr(const char*, const char*)’
  
  /usr/include/string.h:369: error: ambiguates old declaration ‘const char* strcasestr(const char*, const char*)’
  
  make[3]: *** [3gp.o] Error 1
  
  make[3]: Leaving directory `/usr/src/faac-1.28/common/mp4v2'
  
  make[2]: *** [all-recursive] Error 1
  
  make[2]: Leaving directory `/usr/src/faac-1.28/common'
  
  make[1]: *** [all-recursive] Error 1
  
  make[1]: Leaving directory `/usr/src/faac-1.28'
  
  make: *** [all] Error 2

  I read up online and it was saying it was interfearing with something, and I had to locate a file and edit it.

  How do i fix this installation so it install properly.

• whats the difference between “&” and multiple terminals in Linux Multiprocessing [closed]

  11 mai 2022, par Ma XIaoyu

  I am using Linux for multi-task processing. Specifically, calling ffmpeg multiple times to transcoding multi source videos.

  


  Strangely, when I am using :
“
ffmpeg-cmds01 &
ffmpeg-cmds02 &
ffmpeg-cmds03 &
……
”
The ffmpeg process often get errors and stop after a few hours.

  


  However, if I open several terminals and using each terminal for only one ffmpeg cmd( i.e., terminal#1 only run ffmpeg-cmd01 ; ternimal#2 only for ffmpeg-cmd02, etc.) The transcoding procedure can last for dozens of days and no errors are reported.

  


  Could anyone kindly help us to analysis what’s there differences ? Opening multiple terminals is too difficult for managing especially when the number of video streams are up to 300+.

  


  Thanks a lot for help !

  


• Get a still frame during video capture on Linux

  15 janvier 2020, par Arthur Hebert

  I want to capture video from a webcam (saving to file), and occasionally get the most recent still frame on-demand (from python code), while continuing to capture. Is there a way to do this on Linux ?

  To capture video, I am using the following command :

  ffmpeg -f v4l2 -framerate 30 -video_size 1024x576 -i /dev/video0 myvideo.mp4

  Then in another terminal, I try to capture the latest still frame :

  ffmpeg -sseof -3 -i myvideo.mp4 -update 1 -q:v 1 current_frame.jpg

  I get varied responses from this last command, including

  Cannot use -sseof, duration of myvideo.mp4 not known

  and

  [matroska,webm @ 0x55e1aae26900] Duplicate element
   Last message repeated 2 times

  Constraints :

  1. I need to control the solution from python (e.g. calling ffmpeg via subprocess.Popen) to (a) start recording, (b) get frames at arbitrary points, (c) stop recording.

  Flexibility

  1. The frame timing doesn’t have to be exact. It’s okay for it to be a frame within the last couple seconds.
  2. I am not attached to a particular container format (mkv, mp4, etc.)
  3. I am open to programs other than ffmpeg (it’s nice if it works on Windows too, but not required)