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• C# Bitmap to AVI / WMV with Compression

  18 juillet 2016, par Digitalsa1nt

  Prelude :

  I’m going to preface this with, I have been learning C# in my spare time at work, and that I have been staring at code for a solid two days trying to wrap my head around this problem. I am developing some software to be used with a visualiser that connects by USB to a standard Desktop PC, the software detects the capture device and loads frames into bitmap using a New Frame Event, this is then displayed in a ’picture box’ as a live video stream. The problem as it sits is trying to encorporate the ability to record the stream and save to file, preferably a WMV or a compressed AVI.

  What’s been tried :

  I have considered and looked into the following :

  SharpAVI - cant seem to get this to compress or save the frames properly as it appears to mainly look at existing AVI files.

  AForge.Video.VFW - AVI files can be created but are far too large to be used, due to restrictions on the user areas of the individuals who will be using this software.

  AForge.Video.FFMPEG - Again due to considerations of those using this software I can’t have unmanaged DLL’s sat in the output folder with the Executable file, and unfortunately this particular DLL cant be compiled properly using Costura Fody.

  AVIFile Library Wrapper (From Code Project) - Again can’t seem to get this to compress a stream correctly from Bitmaps from the New Frame Events.

  DirectShow - Appears to use C++ and unfortunately is beyond my skill level at this time.

  The Relevant Code Snippets :

  Current References :

  using System.Data;
  
  using System.Drawing;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Windows.Forms;
  
  using System.Resources;
  
  using System.Drawing.Imaging;
  
  using System.IO;
  
  //Aforge Video DLL's
  
  using AForge.Video;
  
  using AForge.Video.VFW;
  
  using AForge.Video.DirectShow;
  
  //Aforge Image DLL's
  
  using AForge.Imaging;
  
  using AForge.Imaging.Formats;
  
  using AForge.Imaging.Filters;
  
  //AviLibrary
  
  using AviFile;

  Global Variables :

      #region Global Variables
  
  
  
      private FilterInfoCollection CaptureDevice; // list of available devices
  
      private VideoCaptureDevice videoSource;
  
      public System.Drawing.Image CapturedImage;
  
  
  
      bool toggleMic = false;
  
  
  
      bool toggleRec = false;
  
      //aforge
  
      AVIWriter aviWriter;
  
      Bitmap image;
  
  
  
  
  
      #endregion

  Code for Displaying Stream

      #region Displays the Stream
  
  
  
      void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          picBoxStream.SizeMode = PictureBoxSizeMode.Zoom;
  
          picBoxStream.Image = (Bitmap)eventArgs.Frame.Clone();// clones the bitmap
  
  
  
  
  
          if (toggleRec == true)
  
          {
  
              image = (Bitmap)eventArgs.Frame.Clone();
  
              aviWriter.AddFrame(image);
  
          }
  
      }
  
  
  
      #endregion

  Current Code for Recording Stream

      #region Record Button
  
  
  
      private void btnRecord_Click(object sender, EventArgs e)
  
      {
  
          if (toggleRec == false)
  
          {
  
              saveAVI = new SaveFileDialog();
  
              saveAVI.Filter = "AVI Files (*.avi)|*.avi";
  
  
  
              if (saveAVI.ShowDialog() == DialogResult.OK)
  
              {
  
                  aviWriter = new AVIWriter();
  
                  aviWriter.Open(saveAVI.FileName, 1280, 720);
  
  
  
                  toggleRec = true;
  
                  Label lblRec = new Label();
  
              }
  
  
  
          }
  
          else if (toggleRec == true)
  
          {
  
              aviWriter.Close();
  
              toggleRec = false;
  
          }
  
      }
  
  
  
      #endregion

  I apoligise if the above code doesn’t look quite right, I have been swapping, changing and recoding those three sections a lot in order to find a working combination. This means that it’s rather untidy but I didn’t see the point in cleaning it all up until I had the code working. That being said really any help that you can provide is greatfully recieved, even if it’s a case of what I want to do just cannot be done.

  Thank you in advance.

  EDIT : PostScript :

  I will be actively working on this monday to friday, so If I make any breakthroughs I will update this Question accordingly, this seems to be a frequently sort after answer so hopefully we can overcome the issues.

• Revision 32042af14b : Renaming of segment constants. Renamed : MAX_MB_SEGMENTS to MAX_SEGMENTS MB_

  23 juillet 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/common/vp9_loopfilter.c

  
   Modify /vp9/common/vp9_loopfilter.h

  
   Modify /vp9/common/vp9_onyx.h

  
   Modify /vp9/common/vp9_pred_common.c

  
   Modify /vp9/common/vp9_seg_common.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/decoder/vp9_decodframe.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_segmentation.c

  
  
  Renaming of segment constants.

  Renamed :
  MAX_MB_SEGMENTS to MAX_SEGMENTS
  MB_SEG_TREE_PROBS to SEG_TREE_PROBS

  The minimum unit for segmentation in the segment map
  is now 8x8 so it is misleading to use MB_ as macro-block
  traditionally refers to a 16x16 region.

  Change-Id : I0b55a6f0426bb46dd13435fcfa5bae0a30a7fa22

• php. ffmpeg. read from input stream. How to ?

  3 décembre 2020, par rzlvmp

  I trying to create mp4 file from looping jpg image. By transfer jpg image as a stdin stream.

  


  $cwd = getcwd();
$env = [];
   
$descriptorspec = array(
    0 => ["pipe", "r"],  // stdin
    1 => ["pipe", "w"],  // stdout
    2 => ["pipe", "w"]   // stderr
);

$transcode_command = 'ffmpeg -y -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -f jpeg_pipe -loop 1 -i pipe:0 -c:v libx264 -r 29.97 -t 30 -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2,setsar=1" -c:a aac -shortest -movflags faststart -f mp4 /tmp/output.mp4';
$process = proc_open($transcode_command, $descriptorspec, $pipes, $cwd, $env);

$s3_client = new Aws\S3\S3Client([
    'calculate_md5' => true,
    'region' => $REGION,
    'version' => 'latest',
    'credentials' => [
        'key'    => $AWS_KEY,
        'secret' => $AWS_SECRET
    ]
]);
$s3_client->registerStreamWrapper();

if (is_resource($process)) {

    $input_stream = fopen('s3://somebucket/image.jpg', 'r');

    if ($input_stream) {

        while (!feof($input_stream)) {
            fwrite($pipes[0], fread($input_stream, 1024));
            fclose($pipes[0]);
        }
        
        $output = stream_get_contents($pipes[1]);
        $error = stream_get_contents($pipes[2]);

        fclose($input_stream);
        fclose($pipes[1]);
        fclose($pipes[2]);

        print_r($output);
        print_r($error);
    }
}


  


  And I've get response

  


  ...
Input #0, lavfi, from 'anullsrc=channel_layout=stereo:sample_rate=44100':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
[mjpeg @ 0xa705a0] EOI missing, emulating
Input #1, jpeg_pipe, from 'pipe:0':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 200x200 [SAR 72:72 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (pcm_u8 (native) -> aac (native))
[mjpeg @ 0xa70c40] overread 8
[mjpeg @ 0xa70c40] EOI missing, emulating
...


  


  Looks like ffmpeg don't wait for stream end (EOI missing, emulating) and trying to create output video after first while iteration. Resulting file is mp4 with one broken frame.
If I set chunk size (1024) bigger than image size, ffmpeg creates only one completed frame.

  


  ffmpeg command working pretty good if I use aws cli (see my answer). But when I try to send input stream via PHP ffmpeg failing.

  


  What problem may be ?..