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• Linux & C : How to set file reading priority in multi-process program while recording mp4 files

  31 octobre 2017, par bala ece17

  This is for an assignment I’m not looking for you to suggest me the answer. I just need someone to point me in the right direction, maybe with a line or two of sample code.

  I need to figure out how to set the priority of a recording mp4 files within my program. To the point :

  i am trying to record from three cameras (1-HD and 2 analog cameras) at the same time and creating its tar file after each recording of duration 60seconds.

  so after a set of records completed, i am taring those files. in doing that i am experiencing frame skip in only HD camera, remain 2 analog cameras are fine.hence forth i decided to set high priority for recording and low priority for taring those files.

  please suggest me some ideas to set the priority, that neglect the frame skip.

  Any help/guidance is appreciated :)

• Memory leak when embedding ffmpeg library in Go program

  29 mars 2019, par andrea

  I’m using go version 1.11.2

  I wrote a go project which using ffmpeg C library.

  When I run this program, I tried to print out memory statistic by runtime.ReadMemStat(). What I got is heap allocated memory is always small (2MB in the picture below) but memory used showed by top command increase gradually until my process is killed by OS. It seems Go cannot manage C-allocated memory.

  So what actually happens or what am I misunderstanding here ??

  Appreciate any helps,

  Thanks in advanced,

  • When I stopped the process, memory usage dropped down intermediately.
  • I tried to test C code, there was no leak in C code.
  • I used debug.GC() to force GoGC running and debug.FreeOSMemory() periodically but it was not working.
  • more info about ReadMemStat, https://golang.org/pkg/runtime/#MemStats

  

• How to pass Ruby's STDIN to an external program called by Open3.popen3 ?

  4 septembre 2015, par Konstantin

  I would like to call ffmpeg from a Ruby script, lets call "vpipe", and I want this Ruby script to act as a filter like command : take its input from a pipe. Its only purpose is to select the first audio stream and delete chapters data if exists :

  #!/usr/bin/ruby
  
  require "open3"
  
  
  
  output_file=ARGV[0]
  
  
  
  cmd=%Q{ffmpeg -y -i - -map 0:v -map 0:a -c:v copy -c:a:0 copy -map_chapters -1 #{output_file}}
  
  
  
  Open3.popen3(cmd,:stdin_data=>STDIN)

  Then I would like to call my program as follows :

  curl http://www.example.com/video.wmv | vpipe processed.wmv

  Unfortunately doesn’t work, because there is no such an option for popen3 as :stdin_data. I also tried Open3.capture3 which can take this argument, but then I got en error message from curl : "Failed writing body".