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• Compiling ffmpeg : how to force it to link to a specific libx264 ?

  29 août 2012, par PaulJ

  I'm trying to compile the newest version of ffmpeg (in CentOS 5.3). I first downloaded the latest version of libx264, compiled it with --enable-static and installed it in /usr/local/. However, when I then compile ffmpeg I get this error message :

  libavcodec/libavcodec.a(libx264.o): In function `X264_init':
  
  /usr/local/src/ffmpeg/libavcodec/libx264.c:494: undefined reference to `x264_encoder_open_125'
  
  collect2: ld returned 1 exit status
  
  make: *** [ffmpeg_g] Error 1

  Searching on the net, I see that this can happen if ffmpeg is picking up an older version of libx264, which I indeed have (in /usr/lib) and can't uninstall because other pieces of software depend on it. The question is then : how can I force ffmpeg to link against the libx264 that I want ? The last time I had to do this (admittedly a year ago) I also had 2 versions of libx264, and I don't remember having to do anything special. Is there a configure switch that I'm forgetting ?

• ffmpeg : using the returned data in php

  4 décembre 2013, par user1503606

  I have started using ffmpeg and I am very new to it, so please bear with me.

  I have installed ffmpeg on my server and it works great ; I can run certain commands and get output data when logged in via ssh

  For example I can run

  ffmpeg -i Sleep\ Away.mp3 

  Which returns the following :

  ffmpeg version 0.8.5, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 20 2012 09:28:43 with clang 3.1 (tags/Apple/clang-318.0.61)
  
    configuration: --enable-nonfree --enable-gpl --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaac --enable-libxvid --enable-libx264 --enable-libvpx --enable-hardcoded-tables --enable-shared --enable-pthreads --disable-indevs --cc=clang
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [mp3 @ 0x7f9694011a00] Header missing
  
      Last message repeated 13 times
  
  [mp3 @ 0x7f9694007c00] max_analyze_duration 5000000 reached at 5007020
  
  [mp3 @ 0x7f9694007c00] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'Sleep Away.mp3':
  
    Metadata:
  
      track           : 3
  
      album           : Bob Acri
  
      artist          : Bob Acri
  
      title           : Sleep Away
  
      genre           : Jazz
  
      album_artist    : Bob Acri
  
      composer        : Robert R. Acri
  
      date            : 2004
  
    Duration: 00:03:21.77, start: 0.000000, bitrate: 192 kb/s
  
      Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 192 kb/s
  
  At least one output file must be specified

  The question I am asking is, how can I use the output data above ? I am developiong a music website ; say I want to loop through all the MP3 files and save the info about them into a database, so that the above would result in :

  Sleep Away.mp3    mp3    3:21    Jazz    2004     Bob Acri ...

  obviously in a table

  I have tried to use the php backtick operator with no success so far. I just thought I would put a question up here to get some advice from people that have done something similar.

  Thanks

  Update : I have tried the following

  &lt;?php $output = `ffmpeg -i Sleep\ Away.mp3`; echo "<pre>$output</pre>"; ?>
  
  &lt;?php $output = shell_exec(&#39;ffmpeg -i Sleep\ Away.mp3&#39;); echo "<pre>$output</pre>"; ?>

  both don't appear to return anything.

• UDP to MP4 transcoding via ffmpeg

  30 juillet 2013, par Andrew J. Freyer

  I have not been able go find any substantial documentation to answer this question, so please forgive me if this is a simple question.

  Quite simply, I am trying to transcode a UDP video stream to a live MP4 stream with ffmpeg.

  I have been unable to successfully implement either step here. Any help or advice is appreciated.