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• FFMpeg doesn't convert the video, just creates a thumb... It was working now not ?

  20 septembre 2011, par Matt Reid

  Theres a site im making for someone where it uses FFMpeg to convert the files to MP4's... I set it up and got the converter working... but now a week or so later ive came to use it and it doesn't convert the video, it runs the create thumbnail exec() but the video exec() doesn't run. It returns a 1 status like its gone through but there is no converted file and the browser quickly processes the convert file rather than lagging for a few seconds like it did when it was working...

  Any ideas ?

   <?php
  
  
  
   //Thumbnail VARS
  
   $tn_size = '480x360';
  
   $tn_interval = 3;
  
   $tn_type = 'mjpeg';
  
  
  
   //Video VARS
  
   $vi_size = '480x360';
  
   $vi_fileto = 'mp4';
  
  
  
   //Default Setup
  
   $id = $_GET['ListingID'];
  
   $ext = $_GET['Ext'];
  
   $temp_url = '/var/www/files/videos-tmp/'.$id.".".$ext;
  
   $new_url = '/var/www/files/videos/'.$id.".mp4";
  
   $new_url_thumb = '/var/www/files/videos-thumb/'.$id.".jpg";
  
  
  
   //echo $new_url."<br />".$id." ".$ext. " " .$temp_url;
  
  
  
   //Do
  
   if(file_exists($temp_url)) {
  
  @unlink($new_url);
  
  //echo "/usr/local/bin/ffmpeg -i {$temp_url} -f {$vi_fileto} -r 25 -ar 22050 -ab 48000      -ac 1 -s {$vi_size} {$new_url}";
  
  exec("/usr/local/bin/ffmpeg -i {$temp_url} -deinterlace -an -ss $tn_interval -f {$tn_type} -t 1 -r 1 -y -s $tn_size &#39;{$new_url_thumb}&#39;"); //make thumbnai
  
  exec("/usr/local/bin/ffmpeg -i {$temp_url} -f {$vi_fileto} -r 25 -ar 22050 -ab 48000 -ac 1 -s {$vi_size} {$new_url}",$output,$status); //convert video
  
  
  
  //@unlink($temp_url);
  
  if(isset($_GET[&#39;UsrOvr&#39;])) { } else {
  
  echo "<b>Convert Complete</b>";
  
  echo "<br /><br />Return to listings <a href="http://stackoverflow.com/feeds/tag/&#39;admin_listings.php&#39;">page</a>.";
  
  exit;
  
  }
  
   } else {
  
  die("The video selected does not exist!");
  
   }
  
   ?>

• Http Streaming from ffmpeg, How to get a sequenced packet ?

  10 septembre 2011, par manutd

  I am trying to make http streaming program.
  So I follow this code at this.
  However, when i decode, only one frame is decoded.
  I think I need call back function.
  Do you know how to make a call back function ?
  I know 'asf' packet's call back function is like int read_data(void *opaque, char *buf, int buf_size)

  But the other formats(mp3, ogg, aac, ..) doesn't work..

  Please help me.

  Any advice or comment are very appreciated.

  #include 
  
  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  
  
  int main(int argc, char **argv)
  
  {
  
          static AVInputFormat *file_iformat;
  
          static AVFormatContext *pFormatCtx;
  
          AVFormatParameters params;
  
  
  
          AVCodecContext *pCodecCtx;
  
          AVCodec *pCodec;
  
  
  
          const char url[] = "http://listen.radionomy.com/feelingfloyd";
  
  
  
          avcodec_register_all();
  
          avdevice_register_all();
  
          av_register_all();
  
  
  
          av_log_set_level(AV_LOG_VERBOSE);
  
  
  
          file_iformat = av_find_input_format("mp3"); /* mp3 demuxer */
  
          if (!file_iformat)
  
          {
  
                  fprintf(stderr, "Unknown input format: %s\n", &amp;url[0]);
  
                  exit(1);
  
          }
  
  
  
          //file_iformat->flags |= AVFMT_NOFILE; /* ??? */
  
          params.prealloced_context = 0;
  
  
  
          if (av_open_input_file(&amp;pFormatCtx, &amp;url[0], file_iformat, 0, &amp;params) != 0)
  
          {
  
                  fprintf(stderr, "err 1\n");
  
                  exit(2);
  
          }
  
  
  
          /* poulates AVFormatContex structure */
  
          if (av_find_stream_info(pFormatCtx) &lt; 0)
  
          {
  
                  fprintf(stderr, "err 2\n");
  
          }
  
  
  
          /* sanity check (1 stream) */
  
          if (pFormatCtx->nb_streams != 1 &amp;&amp;
  
                          pFormatCtx->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
  
          {
  
                  fprintf(stderr, "err 3\n");
  
          }
  
  
  
          pCodecCtx = pFormatCtx->streams[0]->codec;
  
  
  
          /* find decoder for input audio stream */
  
          pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
  
          if (pCodec == NULL)
  
          {
  
                  fprintf(stderr, "err 4: unsupported codec\n");
  
          }
  
  
  
          if (pCodec->capabilities &amp; CODEC_CAP_TRUNCATED)
  
                  pCodecCtx->flags |= CODEC_FLAG_TRUNCATED;
  
  
  
          if (avcodec_open(pCodecCtx, pCodec) &lt; 0)
  
          {
  
                  fprintf(stderr, "err 5\n");
  
          }
  
  
  
          {
  
                  uint8_t *pAudioBuffer;
  
                  AVPacket pkt;
  
  
  
                  int ret;
  
                  int data_size = 2 * AVCODEC_MAX_AUDIO_FRAME_SIZE;
  
  
  
                  av_init_packet(&amp;pkt);
  
                  //pkt.data=NULL;
  
                  //pkt.size=0;
  
                  //pkt.stream_index = 0;
  
  
  
                  pAudioBuffer = av_malloc(data_size * sizeof(int16_t));
  
  
  
                  while (av_read_frame(pFormatCtx, &amp;pkt) == 0) {
  
                          //data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
  
                          ret = avcodec_decode_audio3(pFormatCtx->streams[pkt.stream_index]->codec,
  
                                          (int16_t *)pAudioBuffer, &amp;data_size, &amp;pkt);
  
  
  
                          /* got an error (-32) here */
  
                          if (ret &lt; 0) {
  
                                  av_strerror(ret, (char *)pAudioBuffer, data_size);
  
                                  fprintf(stderr, "err 6 (%s)\n", pAudioBuffer);
  
                                  break;
  
                          }
  
  
  
                          printf("size=%d, stream_index=%d |ret=%d data_size=%d\n",
  
                                          pkt.size, pkt.stream_index, ret, data_size);
  
                          av_free_packet(&amp;pkt);
  
                  }
  
  
  
                  av_free(pAudioBuffer);
  
          }
  
  
  
          avcodec_close(pCodecCtx);
  
          av_close_input_file(pFormatCtx);
  
  
  
          return 0;
  
  }

• How to publish selfmade stream with ffmpeg and c++ to rtmp server ?

  25 octobre 2013, par Alexandr R

  Have a nice day to you, people !

  I am writing an application for Windows that will capture the screen and send the stream to Wowza server by rtmp (for broadcasting). My application use ffmpeg and Qt.
  I capture the screen with WinApi, convert a buffer to YUV444(because it's simplest) and encode frame as described at the file decoding_encoding.c (from FFmpeg examples) :

  ///////////////////////////
  
  //Encoder initialization
  
  ///////////////////////////
  
  avcodec_register_all();
  
  codec=avcodec_find_encoder(AV_CODEC_ID_H264);
  
  c = avcodec_alloc_context3(codec);
  
  c->width=scr_width;
  
  c->height=scr_height;
  
  c->bit_rate = 400000;
  
  int base_num=1;
  
  int base_den=1;//for one frame per second
  
  c->time_base= (AVRational){base_num,base_den};
  
  c->gop_size = 10;
  
  c->max_b_frames=1;
  
  c->pix_fmt = AV_PIX_FMT_YUV444P;
  
  av_opt_set(c->priv_data, "preset", "slow", 0);
  
  
  
  frame = avcodec_alloc_frame();
  
  frame->format = c->pix_fmt;
  
  frame->width  = c->width;
  
  frame->height = c->height;
  
  
  
  for(int counter=0;counter<10;counter++)
  
  {
  
  ///////////////////////////
  
  //Capturing Screen
  
  ///////////////////////////
  
      GetCapScr(shotbuf,scr_width,scr_height);//result: shotbuf is filled by screendata from HBITMAP
  
  ///////////////////////////
  
  //Convert buffer to YUV444 (standard formula)
  
  //It's handmade function because of problems with prepare buffer to swscale from HBITMAP
  
  ///////////////////////////
  
      RGBtoYUV(shotbuf,frame->linesize,frame->data,scr_width,scr_height);//result in frame->data
  
  ///////////////////////////
  
  //Encode Screenshot
  
  ///////////////////////////
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;    // packet data will be allocated by the encoder
  
      pkt.size = 0;
  
      frame->pts = counter;
  
      avcodec_encode_video2(c, &pkt, frame, &got_output);
  
      if (got_output) 
  
      {
  
          //I think that  sending packet by rtmp  must be here!
  
          av_free_packet(&pkt);             
  
  
  
      }
  
  
  
  }
  
  // Get the delayed frames
  
  for (int got_output = 1,i=0; got_output; i++)
  
  {
  
      ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
  
      if (ret < 0)
  
          {
  
              fprintf(stderr, "Error encoding frame\n");
  
              exit(1);
  
          }
  
          if (got_output)
  
          {
  
          //I think that  sending packet by rtmp  must be here!
  
          av_free_packet(&pkt);      
  
          }
  
  }
  
  
  
  ///////////////////////////
  
  //Deinitialize encoder
  
  ///////////////////////////
  
  avcodec_close(c);
  
  av_free(c);
  
  av_freep(&frame->data[0]);
  
  avcodec_free_frame(&frame);

  I need to send video stream generated by this code to RTMP server.
  In other words, I need c++/c analog for this command :

  ffmpeg -re -i "sample.h264" -f flv rtmp://sample.url.com/screen/test_stream

  It's useful, but I don't want to save stream to file, I want to use ffmpeg libraries for realtime encoding screen capture and sending encoded frames to RTMP server inside my own application.
  Please give me a little example how to initialize AVFormatContext properly and to send my encoded video AVPackets to server.

  Thanks.