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• Decoding with FFMPEG on Visual Studio 2010

  6 juin 2013, par user2439801

  I just started using FFMPEG with C++ and try to code an audio decoder then write the decoded audio into a file.

  However i'm not sure about which data to write to the output file. As far as i know from looking at the sample codes it seems to be the AVFrame -> data[0].
  But when i try to print it on the consoles, i get some random numbers that are different each time i run the program. And when i try to write this AVFrame->data[0] into a file i keep getting an error.

  So my question is how can i write the decoded audio after i call the function av_codec_decode_audio4 ?

  Below i attached my code and i pass the argument "C :\02.mp3" which is a path for a valid mp3 file on my PC.

  Thank you for your help.

  // TestFFMPEG.cpp : Audio Decoder
  
  //
  
  
  
  #include "stdafx.h"
  
  
  
  #include <iostream>
  
  #include <fstream>
  
  #include <sstream>
  
  
  
  extern "C" {
  
      #include 
  
      #include 
  
      #include 
  
  
  
  }
  
  
  
  using namespace std;
  
  
  
  
  
  int main(int argc, char* argv[])
  
  {
  
  int audioStream = -1;
  
  
  
  AVCodec         *aCodec;
  
  AVPacket        avPkt;
  
  AVFrame         *decode_frame = avcodec_alloc_frame();
  
  
  
  AVCodecContext  *aCodecCtxt;
  
  AVFormatContext *pFormatCtxt = NULL;
  
  
  
  if(argc != 2) {     // Checking  whether there is enough argument
  
      return -1; 
  
  }
  
  
  
  av_register_all();  //Initialize CODEC
  
  avformat_network_init();
  
  av_init_packet (&amp;avPkt);
  
  
  
  
  
   if (avformat_open_input (&amp;pFormatCtxt, argv[1],NULL,NULL)!= 0 ){ //Opening File
  
       return -2;
  
   }
  
  
  
   if(avformat_find_stream_info (pFormatCtxt,NULL) &lt; 0){ //Get Streams Info 
  
       return -3; 
  
   }
  
  
  
   AVStream *stream = NULL;
  
   //av_read_play (pFormatCtxt); //open streams
  
  
  
  
  
   for (int i = 0;  i &lt; pFormatCtxt->nb_streams ; i++) { //Find Audio Stream
  
       if (pFormatCtxt->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO){
  
           audioStream =i;
  
       }
  
   }
  
  
  
   aCodecCtxt = pFormatCtxt ->streams [audioStream]->codec; // opening decoder   
  
   aCodec = avcodec_find_decoder( pFormatCtxt->streams [audioStream] ->codec->codec_id);
  
  
  
   if (!aCodec) {
  
       return -8;
  
   }
  
  
  
   if (avcodec_open2(aCodecCtxt,aCodec,NULL)!=0) {
  
       return -9; 
  
   } 
  
  
  
  int cnt = 0;
  
  
  
  while(av_read_frame(pFormatCtxt,&amp;avPkt) >= 0 ){
  
  
  
      if (avPkt.stream_index == audioStream){
  
          int check = 0; 
  
          int result = avcodec_decode_audio4 (aCodecCtxt,decode_frame,&amp;check, &amp;avPkt);
  
          cout &lt;&lt; "Decoded : "&lt;&lt; (int) decode_frame->data[0] &lt;&lt;", "&lt;&lt; "Check : " &lt;&lt; check &lt;&lt; ", Format :" &lt;&lt; decode_frame->format &lt;&lt;" " &lt;&lt; decode_frame->linesize[0]&lt;&lt; " "&lt;<cnt return="return" acodec="acodec">id;  
  
  } 
  
  </cnt></sstream></fstream></iostream>

• How to properly open libvpx for encoding in via avcodec_open2() ?

  10 juin 2014, par Edison

  With a valid AVCodec and a valid AVContext, when calling avcodec_open2() EINVAL (-22, Invalid arguments) is returned, it turns out the EINVAL is triggered via

      ret = avctx->codec->init(avctx);
  
      if (ret < 0) {
  
          goto free_and_end;
  
      }

  inside avcodec_open2().

  The same code that I have right now can open mpeg4 and h264 just fine.

  Are there any special option parameters that has to be set (e.g. for h263, image size has to be multiples of certain numbers) to open libvpx codec ?

• Separate Audio and Video in android

  13 février 2014, par Manoj

  I am beginner to Android application development,The aim of my project is to separate a audio and video from video file. after surfing in internet i came to know that, using FFmpeg we can do it.

  ffmpeg -i input.mkv # show stream numbers and formats
  
  ffmpeg -i input.mkv -c copy audio.m4a # AAC
  
  ffmpeg -i input.mkv -c copy audio.mp3 # MP3
  
  ffmpeg -i input.mkv -c copy audio.ac3 # AC3
  
  ffmpeg -i input.mkv -an -c copy video.mkv
  
  ffmpeg -i input.mkv -map 0:1 -c copy audio.m4a # stream 1

  separated video file wouldn't contain any audio it must be contain only video type.
  whether this option too possible in ffmpeg ?
  is any other alternative option there ?.