Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• FFMPEG shell execution with PHP - Unusual Error Because of GCC

  9 février 2012, par trocker

  I've been trying to debug the PHP Script, but the error message that I receive is very unusual.

  • CP, MV , WHOAMI - all these commands work with shell_exec
  • FFMPEG is installed
  • apache user - nobody with read write execute permission for nogroup to /usr/bin/ffmpeg.
  • FFMPEG working fine in terminal.
  • GCCPP is installed and GCC package is also installed.
  • Working with shell PHP command (brock@ubuntu~$ php runthis.php)

  Code I ran:

  exec('ffmpeg -i beep.mp3 -ac 1 -ar 48000 -ab 128k audio1.mp3 2>&1', $out, $rv);
  echo "output is:\n".implode("\n", $out)."\nexit code:$rv\n";
  

  I get the following error:

  output is: ffmpeg: /opt/lampp/lib/libgcc_s.so.1: version `GCC_4.0.0' not found (required by /usr/lib/libdirac_encoder.so.0) ffmpeg: /opt/lampp/lib/libgcc_s.so.1: version `GCC_4.2.0' not found (required by /usr/lib/libstdc++.so.6) exit code:1
  

  Can someone help me out here?

• Extracting clips from videos using the FFMPEG library - issue with audio

  9 février 2012, par velocipedestrian

  I'm trying to get my program to extract short clips from longer videos using the ffmpeg library. I found the dranger tutorial, which reads in video from files, and output-example.c, which outputs video, so right now I'm trying to glue the two together. The video works fine, but the audio appears to be sped up/corrupt.

  while(av_read_frame(pFormatCtx, &packet)>=0)
  {
      if(packet.stream_index==audioStream)
      {
          write_audio_frame(oc, audio_st);
      }
      ...
  }
  
  ...
  
  static void write_audio_frame(AVFormatContext *oc, AVStream *st)
  {
      AVCodecContext *c;
      AVPacket pkt;
      av_init_packet(&pkt);
      c = st->codec;
      static uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2];
      uint8_t* audio_buf_ptr = audio_buf;
      uint8_t *audio_pkt_data = packet.data;
      int audio_pkt_size = packet.size;
      int len1,data_size;
      data_size = sizeof(audio_buf);
      len1 = avcodec_decode_audio3(aCodecCtx, (int16_t *)audio_buf, &data_size,
                        &packet);
      samples = (uint16_t*) audio_buf;
      pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
      pkt.flags |= PKT_FLAG_KEY;
      pkt.stream_index= st->index;
      pkt.data= audio_outbuf;
      av_interleaved_write_frame(oc, &pkt);
  }
  

  pFormatCtx and oc are the input and output AVFormatContexts defined in dranger 1 and output-example.c respectively. audio_st is an AVStream defined in output-example.c. I tried inserting a

  pkt.pts = av_rescale_q(packet.pts, pFormatCtx->streams[audioStream]->time_base, st->time_base);
  

  but that did not fix the problem either.

• ffmpeg compiling on MSVC9 (Visual C++ 2008)

  9 février 2012, par Dr Deo

  i want to compile ffmpeg on windows MSVC9 (Visual C++ 2008) because i want to use it in wamp server 2 which is compiled using the same compiler however am currently at a loss of how to do this as there are no visual studio solution files. I know it is possible because people have compiled dlls but i cant seem to find just how they did it . There are also some precompiled dlls here but they are incompatible with my php version 5.38. Please help

• How can I tell if a file is a valid video stream using RVideo ?

  8 février 2012, par fenec

  I am trying to see if a file has a valid video stream using the RVideo library:

  read_file.rb:

  require 'rubygems'
  require 'rvideo'
  
  file_path="/mnt/glusterfs/video/2012/02/04/2012-02-04 1000 CSPAN United Nations Security Council Meeting (337711).mp4"
  puts file_path
  file = RVideo::Inspector.new(:file => file_path)
  

  I get this error:

  rbennacer@services:~$ ruby read_file.rb 
  /mnt/glusterfs/video/2012/02/04/2012-02-04 1000 CSPAN United Nations Security Council Meeting (337711).mp4 
  sh: Syntax error: "(" unexpected
  

  Even when I put a backslash before each space character and parenthesis character, I am getting that error.

• Automatic ffmpeg conversion of only completed, fully uploaded files

  8 février 2012, par user374407

  Maybe it would be best to start by describing the scenario.

  We have a Debian server with ffmpeg that we use to covert various video files into FLV. The files are supplied by a number of different people via FTP and are kept in the "uploads" folder.

  I need to write a PHP script that would go through all the files in the uploads folder, select the ones which are complete (i.e. not currently being uploaded or without any uploading errors) and then convert them to FLV using ffmpeg.

  I can do the conversion and everything else, but how do I determine whether a file is complete and fully uploaded?

  Many thanks!