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• FFMPEG - ogg av_write_frame/av_interleaved_write_frame delay with gop_size

  6 juin 2016, par Rameez Usmani

  I am working on a screen casting application. I am using libavcodec to encode captured images into ogg video frames. I am opening AVIOContext using in memory buffer and a write callback [write_buf].

  AVIOContext *octx=avio_alloc_context(tbuff,bsize,1,dc,NULL,write_buf,NULL);

  and I set this to my AVFormatContext->pb=octx ;

  My codec is AV_CODEC_ID_THEORA. After encoding image to theora using avcodec_encode_video2 I pass output AVPacket to av_write_frame or av_interleaved_write_frame.

  My problem is that when I set gop_size to 0 , my callback is called immediately after av_write_frame but if I set gop_size to any number X then after first frame my callback is called after every X frames. I debugged and avcodec_encode_video2 is returning 0 on every call which means no error.

  How can I make my callback called after every call of av_write_frame with gop_size set to any number. This is seriously giving my live stream a big lag. Please help

• How to use ffmpeg commnad in android with input and output file path ?

  27 mai 2016, par Gaju

  I want use ffmpeg command in android app.i am using this library to start with ffmpeg.

  http://writingminds.github.io/ffmpeg-android-java/

  i have developed a demo app and also run the command

  ffmpeg -version

  this command also giving exact ouput. but when i am giving any file path with name my command always fail for this i am using :

              String cmd[] = new String[]{"ffmpeg", "-i", "/storage/emulated/0/Videos/dheere.mp4", "-c:v", "libx264", "/storage/emulated/0/Videos/dheere2.3gp"};
  
              execute(cmd);
  
  
  
  
  
  
  
  
  
    private void execute(String cmd[]) {
  
  
  
  
  
      try {
  
          // to execute "ffmpeg -version" command you just need to pass "-version"
  
          FFMpegApp.getFfmpeg().execute(cmd, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.e("gc", "Command Started");
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
                  Log.e("gc", "onProgress" + message);
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.e("gc", "onFailure command" + message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.e("gc", "onSuccess command" + message);
  
              }
  
  
  
  
  
              @Override
  
              public void onFinish() {
  
                  Log.e("gc", "onFinish command");
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // Handle if FFmpeg is already running
  
          e.printStackTrace();
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
  }

  please give me any suggetion how to use command in android ?
  thanks in advance.

• how to use ffmpeg commands in php

  11 mai 2016, par Angry Khan

  I have to execute some ffmpeg command using PHP, by giving some input parameters and a output file parameter. How would I be doing it. I dont know much about php.
  Help will be appreciated.

  ffmpeg32 -i in.mp3 -metadata title="The Title You Want" -metadata artist="Artist Name" -metadata album="Name of the Album" out.mp3

  I tried this so far but it didn’t worked.

   <?php
  
  $output = shell_exec("ffmpeg32 -i $mp3 -metadata title="$row_sr['dbtitle'];" -metadata artist="$row_sr['dbartist'];" -metadata album="$row_sr['dbalbumb'];" $mp3");
  
  echo "<pre>$output</pre>";
  
  ?>