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• Image edited and saved in C# can not be read by ffmpeg

  13 juillet 2017, par mmijic

  I have template image (template.jpg) on which I draw some text (13.07.2017.) and than I save it to another location (temp/intro.jpg).

  Than I want to convert that and some other images into video with ffmpeg.

  If I run command

  ffmpeg.exe -f concat -safe 0 -i input.txt -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4

  Those images gets concentrated into one video file. Problem is that this image edited through C# is black in final video.

  If I for example open that C# created image in Adobe Fireworks and just save it (CTRL+S) without changing anything, and re run ffmpeg command everything is fine.

  This is code which I use to add text to template image

  //INTRO IMAGE CREATION
  
  Bitmap image = new Bitmap(1280, 720);
  
  image.SetResolution(image.HorizontalResolution, image.VerticalResolution);
  
  Graphics g = Graphics.FromImage(image);
  
  g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
  
  g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
  
  g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
  
  g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
  
  StringFormat format = new StringFormat()
  
  {
  
      Alignment = StringAlignment.Near,
  
      LineAlignment = StringAlignment.Near
  
  };
  
  
  
  //template
  
  Bitmap back = new Bitmap(Application.StartupPath + @"\Templates\template.jpg");
  
  g.DrawImage(back, 0, 0, image.Width, image.Height);
  
  
  
  //date
  
  string Date = dateIntro.Value.ToString("dd.MM.yyyy.");
  
  var brush = new SolidBrush(Color.FromArgb(255, 206, 33, 39));
  
  Font font = new Font("Ubuntu", 97, FontStyle.Bold, GraphicsUnit.Pixel);
  
  float x = 617;
  
  float y = 530;
  
  
  
  g.DrawString(Date, font, brush, x, y, format);
  
  g.Flush();
  
  image.Save(Application.StartupPath + @"\temp\intro.jpg", ImageFormat.Jpeg);
  
  image.Dispose();

  Image created this way can be opened and viewed in any program except converted to video with ffmpeg.

  Is there anything I’m missing while adding text and saving image in C# ?

• How to insert image (logo) at the right-top position inside video using PHP

  8 novembre 2014, par user3502020

  What I am trying to do is, placing a small static image on inside a video clip at server side, by making use of PHP.

  For example, in TV news, you might see the culprit’s photo at a corner when the anchor describes about a crime incident.

  I listen about ffmpeg function. can somebody tell me about this and how I can to use that and insert the image inside the video.

  Thanks very much to helpers :)

• processing .raw file image with ffmpeg api or C code

  12 mars 2013, par Ahmed Kato

  I am trying to process a .raw image file captured using vrl2, it's a h264 encoded image with yuv422 color space from a Logitech c920 webcam, dcraw is not working for me however from my previous question this command is working fine with low performance (a 32kb jpg image however using opencv capture I get a 900kb image for the same 640x480 resolution) :

  ffmpeg -f rawvideo -s 640x480 -pix_fmt yuyv422 -i frame-1.raw
  frame-1.jpg

  I need a code written in C or the ffmpeg api/OpenCV etc .. to do the same as this command,I don't want to use QProcess in Qt(I am working on a server using Qt where I am trying to send the raw file from a Raspberry PI to the server and process it their), dcraw output is a corrupted image.