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• PHP and FFMPEG advice/solution for a unknown issue

  26 mars 2018, par sonam Sharma

  I am having a live video streaming website and I allow people to upload all the video files to the site till now everything is ok.

  What I am doing is that I am using FFMPEG to convert the video to mp4 and also get a image out of the video after 20 seconds.

  The code that I am using is that :

   require 'vendor/autoload.php';
  
          $getEXT_check=substr(@$_FILES['profileimage99']['name'],-3);
  
          if($getEXT_check !='mp4' && $getEXT_check !='MP4'){
  
          exec('ffmpeg -i '.$uploadfile.' -f mp4 -s 896x504 '.$new_flv.''); }
  
          //execute ffmpeg and create thumb
  
          exec('ffmpeg  -i '.$uploadfile.' -ss 00:00:20 -vframes 1  '.$new_image_path);
  
          $theduration=exec('ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 '.$uploadfile.' 2>&1');
  
          $theduration_val=round($theduration/60, 2);

  What issue I am having is that

  1. sometimes the code dosent extract the image out of video
  2. video conversation takes very long time for non mp4 video (I am not converting mp4 videos)

  Some info what I have done on server. During the development of site I installed ffmpeg on my pc and downloaded the vendor directory by composer.json file. But I have not done these things on my server I have a dedicated server from bluehost and have ffmpeg installed at this location.

  /usr/local/bin/ffmpeg
  
  /usr/local/bin/mplayer
  
  /usr/local/bin/mencoder
  
  /usr/bin/flvtool2
  
  /usr/local/bin/MP4Box
  
  /usr/local/bin/yamdi

  During uploading the site what I did is that I also uploaded the vendor directory and all the files and made the site live. I haven’t used any of the path as given by my server admin after asking.

  Please suggest me something where I am doing wrong.

• avformat : make avformat_close_input() more tolerant.

  3 septembre 2013, par Clément Bœsch

  avformat : make avformat_close_input() more tolerant.
  The purpose of this commit is to make error management simpler and less
  
  error prone, just like av_free() which is safe with NULL.
  

  • [DH] doc/APIchanges
  • [DH] libavformat/utils.c
  • [DH] libavformat/version.h

• Failing to read frames from stream after interrupt

  16 août 2013, par Ryan

  I'm using FFmpeg to read and decode a network video stream. I have the read/decode stuff happening on a dedicated thread. Occasionally, I would like to join on that thread. To do this, I've tried specifying an interrupt callback and flags to indicate that reads should be non-blocking. I have most of the basics working, but I'm running into an issue with my av_read_frame after an interrupt. Here's the basic structure :

  void read()
  
  {
  
      AVPacket pkt;
  
  
  
      while (shouldRead)
  
      {
  
          if (av_read_frame(formatCtx, &pkt)
  
          {
  
              // succesfully read frame
  
          }
  
          else
  
          {
  
              // failed to read frame
  
          }
  
      }
  
  }
  
  
  
  int interrupt_cb(void* param)
  
  {
  
      return shouldInterrupt;
  
  }
  
  
  
  void initialize() 
  
  {
  
      formatCtx = avformat_alloc_context();
  
      formatCtx->flags |= AVFMT_FLAG_NONBLOCK;
  
      formatCtx->flags |= AVIO_FLAG_NONBLOCK;
  
      formatCtx->interrupt_callback.callback = interrupt_cb;
  
  
  
      // ...other initialization stuff (e.g. avformat_open_input, etc.)
  
  }

  After initialization, everything looks fine - I happily chug along reading frames. However, if I ever try to interrupt by setting shouldInterrupt to true, all subsequent av_read_frame calls fail. Also, the interrupt callback never gets called again. Digging into the code a bit, I see that formatCtx->packet_buffer is empty. Given that, it makes sense that the reads fail. How do I resume reading after the interrupt then ? I'd rather not have to tear down completely to resume reading and decoding.

  UPDATE : I recently discovered that there's an AVIO_FLAG_NONBLOCK flag as well. I tried that but it didn't seem to help.