Les articles publiés sur le site

• How to install ffmpeg in ubuntu 12.04 ? [on hold]

  14 août 2013, par Dhaval

  I have used ubuntu 12.04 and i want to use ffmpeg for thumbnail image for flv file but not install in my machine and also php.ini file.

• How to install FFMpeg in WampServer 2.1 (Windows XP)

  14 août 2013, par Raja Bilal Ahmed

  I m using php 5.3.5 on windows xp and now i try to install ffmepg from this link http://sergey89.ru/files/ffmpeg-php-win32-all.zip when i resart my wamp server i got this warning PHP Startup:ffmpeg: Unable to initialize module Module compiled with modle API=2006013 PHP compiled with module API=20060626 These options need to match Kindly someone guide me how i correct this problem.

• How to execute command line ffmpeg commands programatically in android ?

  14 août 2013, par Md. Arafat Al Mahmud

  I have successfully built ffmpeg for android using the bambuser . Now I have to build a sample converter application like mp4 to 3gp. I know there are command line commands ffmpeg -i video_origine.avi video_finale.mpg. But I don't know how to execute these commands programatically. I have sample code like

  jint Java_com_example_ndklearning1_MainActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename)
  {
      av_register_all();
  
      AVFormatContext *pFormatCtx;
      const jbyte *str;
      str = (*env)->GetStringUTFChars(env, filename, NULL);
  
      if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
      {
          LOGE("Can't open file '%s'\n", str);
          return 1;
      }
      else
      {
          LOGI("File was opened\n");
          LOGI("File '%s', Codec %s",
              pFormatCtx->filename,
              pFormatCtx->iformat->name
          );
  
      }
      return 0;
  }
  

  This code open's a file and extracts the codec information. All I want is that, to convert the opened file in a desired format. Any kind of help such as code snippet or steps to follow will be highly appreciated.

  Can ffmpeg API serve my purpose ? If there is existing API available, it will be more helpful

• "Vorbis Extradata missing" when trying to get stream's information about the codec

  14 août 2013, par noobed

  Hello I've got a problem when loading AVCodec for an flv file. (there seems to be no problem when loading mp3 or avi file)

  The actual error is : [vorbis @ 0x1550aa0] Extradata missing.

  So I'll keep it simple and ask you:

  1) Anyone familiar with this type of error?

  Since I've spent some hours googling but with no success

  2) What exactly does "extradata missing" mean in context of ffmpeg avcodec_open2()

  You can see my code below:

  #ifdef __cplusplus
  
  #define __STDC_CONSTANT_MACROS
  
  #ifdef _STDINT_H
  
      #undef _STDINT_H
  
  #endif
  
  #endif
  
  #include 
  extern "C" { 
  #include avcodec.h>
  #include avformat.h> 
  #include avutil.h>
  #include samplefmt.h>
  
  }
  #include 
  
  
  
  int main(int argc, char * argv[])
  {
  if(argc < 2)
  {
      printf("you need to specify filename \n");
      return -1;
  }
  av_register_all();
  avcodec_register_all();
  
  //opening a file
  AVFormatContext *avFormatContext = NULL;
  int ret = avformat_open_input(&avFormatContext, argv[1], NULL, NULL);
  if (ret < 0) 
  return -2; // Couldn't open file
  
      //print some basic info
  printf("num of streams = %u\n", *(&avFormatContext->nb_streams));
  printf("filename = %s\n", *(&avFormatContext->filename));
  printf("start time = %ld \n", *(&avFormatContext->start_time));
  printf("duration = %ld \n", *(&avFormatContext->duration));
  printf("bit rate = %d\n", *(&avFormatContext->bit_rate));
  printf("audio codec id = %d \n\n\n", *(&avFormatContext->audio_codec_id));
  
  AVCodecContext * pCodecContext;
  int audioStreamId = -1;
  for(int i = 0; i < avFormatContext->nb_streams; i++)
  {
      if(avFormatContext->streams[i]->codec->codec_type == \
      AVMEDIA_TYPE_AUDIO)//CODEC_TYPE_AUDIO)
      {
          audioStreamId = i;
          break;
      }
  }       
  
  if(audioStreamId == -1)
      return -3; //Didn't find an audio stream
  
  
  printf("audioStreamId = %d \n", audioStreamId);
  
  pCodecContext = avFormatContext->streams[audioStreamId]->codec;
  if(pCodecContext == NULL)
      return -10;
  
  
  
  
  //The stream's information about the codec is in what 
  //we call the "codec context." This contains all the information 
  //about the codec that the stream is using, and now we have a pointer to it. 
  //But we still have to find the actual codec and open it:
  
  
  AVCodec *pCodec;
  AVDictionary *options;
  //Find the decoder for the audio stream
  pCodec = avcodec_find_decoder(pCodecContext->codec_id);
  
  printf("TEST codec name = %s fullName = \
     %s\n",pCodec->name, pCodec->long_name);
  
  if(pCodec == NULL)
      return -4; //Codec not found
  //Open codec
  //avcodec_open2 - This function is not thread safe!
  //Prior to using this function the context has to be allocated with 
      //  avcodec_alloc_context3().
  pCodecContext = avcodec_alloc_context3(pCodec);
  
  printf("test 0\n");
  if(pCodecContext == NULL)
      return -5; //Could not allocate audio codec context
  
  printf("test 1\n");
  if(avcodec_open2(pCodecContext, pCodec, NULL) < 0)
      return -6; //Couldn't open codec
  
  printf("test 2\n");
  
  avformat_close_input(&avFormatContext);
  
  return 0;
  }
  

  These are the last lines of my output screen:

  TEST codec id = 86021
  t0
  t1
  [vorbis @ 0x19eeaa0] Extradata missing.
  

• using ffmpeg to generate thumbnails from remote URL

  13 août 2013, par Wendy Lam

  I can generate thumbnails from local file, but don't know how to do the tricks to the remote url.

  ffmpeg -itsoffset -30 -i /home/test/test.flv -vcodec mjpeg -vframes 1 -an -f rawvideo -s 160x120 test.jpg"

  but ffmpeg -itsoffset -30 -i http://www.test.com/test.flv -vcodec mjpeg -vframes 1 -an -f rawvideo -s 160x120 test.jpg"

  using the URL it won't generate any thumbs.