Newest 'ffmpeg' Questions - Stack Overflow

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• iOS how to build ffmpeg

  10 février 2012, par zvoice

  How to build ffmpeg for iOS? I have got 5.0 framework and scripts from iFrameExtractor fail to build it with - invalid operand on inline asm ldr ${0:q}, $1

  Do you have a successfull experience with it?

• 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.