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• VB.NET Redirect frames from ffmpeg to picturebox

  18 février 2015, par Zed Machine

  i need to do a vb form to show frames from a video.
  i need only a trackbar to seek for specific timecode.

  ffmpeg with this command "-ss %seconds%" can seek for the current value of the trackbar, that it’s the frame to seek in the specified timecode .

  these are my questions :

  1. how can i redirect ffmpeg output frame into a picture box (ffmpeg can encode in bmp if needed) without writing it to the harddrive ?

  2. there are function to convert easily seconds to HH:MM:SS.000 or i have to use division and mod ?

  3. there is a better way to do it ?

  thank to everyone.

• create video from images and then stream to users

  9 janvier 2014, par Abdul Ali

  idea is to create a video from images provided by a user and at the same time stream the generated video to other user demanding it.

  kindly tell any efficient way to do this and which language out of PHP and C# .net will be suitable.

  have looked into ffmpeg to take images and convert to video and save to server and then stream .. kindly tell if this the possibility or any other method for live streaming.

  regards

  UPATE

  consider the following scenario as I understand :

  get images from server and start combining them to form a video. at the same time, stream the video to the users requesting it.. for new coming clients, stream the previously generated video from the begining and keep on sending the new video which is being generated from images to the previous clients.

  kindly tell if this is possible, if so then what can be the approach. Have read something about pipes but am completely new to ffmpeg and streaming in general.

• error in ffmpeg when sending image from pipe via php

  12 décembre 2013, par Abdul Ali

  used the following tutorial to send an uploaded image to ffmpeg from php via pipe.

  Image pipe from php to ffmpeg

  however it raises an eror saying that the pipe has invalid data in it.

  pipe:: Invalid data found when processing input

  following is the php code for uploading an image file

  $tempPath = $_FILES['vdofile']['tmp_name'];
  
  
  
  print_r($tempPath);
  
  
  
  $descriptorspec = array(
  
      0 => array("pipe", "r"), // stdin is a pipe that the child will read from
  
      1 => array("pipe", "w"), // stdout is a pipe that the child will write to
  
      2 => array("file", "error-output.txt", "a") // stderr is a file to write to
  
      );
  
  
  
  $img = imagecreatefromjpeg($tempPath);
  
  
  
   $proc = proc_open("ffmpeg image2pipe -i - -y image.jpg", $descriptorspec, $pipes);
  
  
  
   if (is_resource($proc)) {     
  
       /*
  
        * $pipes[0] = write something to command being run
  
        * $pipes[1] = read something from command
  
        * $pipes[2] = error from command 
  
        */
  
         fwrite($pipes[0], $_FILES['vdofile']['tmp_name']);
  
         fclose($pipes[0]);
  
   }
  
   proc_close($proc);
  
  ?>

  and simple html uploading code is as follows :

   <form action="upload.php" method="post" enctype="multipart/form-data">
  
          <input type="file" />
  
  
  
          <input type="submit" value="Upload" />
  
      </form>

  the error file generated is as follows :

      ffmpeg version N-58485-ga12b4bd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 26 2013 22:07:02 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 55.100 / 52. 55.100
  
    libavcodec     55. 44.100 / 55. 44.100
  
    libavformat    55. 21.102 / 55. 21.102
  
    libavdevice    55.  5.101 / 55.  5.101
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  pipe:: Invalid data found when processing input

  any assistance will be appreciated.

  **

  EDIT

  **

  the code still produces an error :

      ffmpeg version N-58485-ga12b4bd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 26 2013 22:07:02 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 55.100 / 52. 55.100
  
    libavcodec     55. 44.100 / 55. 44.100
  
    libavformat    55. 21.102 / 55. 21.102
  
    libavdevice    55.  5.101 / 55.  5.101
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [image2pipe @ 00000000029ee0a0] Could not find codec parameters for stream 0 (Video: none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  pipe:: could not find codec parameters

  the following ffmpeg comand is called from within php like above :

  ffmpeg -f image2pipe -i - -vcodec mjpeg -vframes 1 -an -f mjpeg image.mp4