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• Shell script not working on a different server

  11 novembre 2013, par Alex Blundell

  I've just migrated a shell script to another server with similar specs (same CentOS version) but the following command seems to fail :

  find /home/removed/captures -name '*.avi' -exec ffmpeg -y -i {} -ab 1280 -b 1024000 {}.mp4 \;

  The following message gets returned :

  find: `ffmpeg': No such file or directory

  I have installed ffmpeg, and made sure it runs from the command line. I've also tried passing in the full path to ffmpeg instead of just 'ffmpeg'. Both ffmpeg versions are the same on each server. I was thinking it was something to do with syntax of the find program changing between versions, but they're both the same version too. This runs via the root crontab.

  The script does run by itself though if I call it directly. Could this be an issue with permissions ? It runs on a cPanel server.

  Thanks :)

• possible C code implementation ideas for a given shell script(related to ffmpeg)

  21 août 2011, par Ted

  The shell script i'm trying to implement goes like this,

      #!/bin/bash
  
      while [ 1 ]
  
      do
  
         nc -l 1234 | ffmpeg -i pipe:0 -vcodec mpeg4 -s qcif -f m4v -y pipe:1 | nc localhost 1235
  
      done 

  what it does is to simply take in a stream of video input through network and do live video transcoding(with ffmpeg of course !) and streaming back the video through the net. my question is how should i go by to implement this functionality in a clean C code. i know i can use popen() to pipe such a command from a c code but i would like to do better. may be with sockets and staff... any pointers are appreciated.

  AskLearnDo.

• lavc : do not implicitly share the frame pool between threads

  17 janvier 2017, par Anton Khirnov

  lavc : do not implicitly share the frame pool between threads
  Currently the frame pool used by the default get_buffer2()
  
  implementation is a single struct, allocated when opening the decoder.
  
  A pointer to it is simply copied to each frame thread and we assume that
  
  no thread attempts to modify it at an unexpected time. This is rather
  
  fragile and potentially dangerous.
  With this commit, the frame pool is made refcounted, with the reference
  
  being propagated across threads along with other context variables. The
  
  frame pool is now also immutable - when the stream parameters change we
  
  drop the old reference and create a new one.
  

  • [DH] libavcodec/decode.c
  • [DH] libavcodec/internal.h
  • [DH] libavcodec/pthread_frame.c
  • [DH] libavcodec/utils.c