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• Linux C Makefile (FFmpeg) undefined reference to `curl_easy_init'

  23 juillet 2015, par hoschi111

  I did some changes to /libavformat/concat.c in the FFmpeg source.
  There I included libcurl.

  Internet says I have to add the following code to ’Makefile’.

  INCLUDE = -I/usr/local/include
  
  LDFLAGS = -L/usr/local/lib
  
  LDLIBS = -lcurl

  That did not work.
  I use this to build FFmpeg :

  make clean && ./configure --prefix=/usr --enable-gpl --enable-libmp3lame --enable-libx264 && make -j 4

  Error :

  /usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/libavformat.a(concat.o): In function `concat_read':
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:151: undefined reference to `curl_easy_init'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:155: undefined reference to `curl_easy_setopt'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:156: undefined reference to `curl_easy_perform'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:158: undefined reference to `curl_easy_getinfo'

  original Makefile :
  https://github.com/FFmpeg/FFmpeg/blob/master/Makefile

  Can you help me ?

• FFMPEG Converting a bunch of PNG images to a video

  7 février 2017, par user2419553

  I have a folder full of 600 .png’s that I’d like to convert to a video using FFMPEG. The .png filenames are as follows :

  f_001.png

  f_002.png

  f_003.png

  ...

  f_600.png

  I’ve been trying to use the following command to try to convert them :

  ffmpeg -r 10 -i root/Record/frames/f_%03d.png -vcodec libx264 -crf 0 /root/Record/"$(date +"%Y_%m_%d %I.%M %p")".mkv

  But I keep getting the error :

  Could find no file with path 'root/Record/frames/f_%03d.png' and index in the range 0-4
  
  root/Record/frames/f_%03d.png: No such file or directory

• Terminal text becomes invisible after terminating subprocess

  22 mai 2022, par wim

  After terminating an ffmpeg subprocess, the terminal gets messed up - typed characters are invisible ! The input still works in that commands can be executed, but keyboard input is not echoed to the terminal.

  



  Issuing shell command reset puts everything back to normal (or !reset from within ipython), so a workaround the issue is calling os.system('reset') inside the script.

  



  Other things I've tried : import curses; curses.initscr() before spawning the subprocess and curses.endwin() after termination, which worked somewhat but broke other stuff. Another possibly related issue is that after spawning the child process, the interactive terminal becomes laggy and sometimes fails to capture typed characters.

  



  The code to spawn the process looks like :

  



  with open('/tmp/stdout.log', 'w') as o:
    with open('/tmp/stderr.log', 'w') as e:
        proc = subprocess.Popen([args], stdout=o, stderr=e)


  



  And later to stop it :

  



  proc.terminate()
proc.communicate()


  



  What could be going wrong here ?