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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# ?

• opus : add a native Opus encoder

  11 février 2017, par Rostislav Pehlivanov

  opus : add a native Opus encoder
  This marks the first time anyone has written an Opus encoder without
  
  using any libopus code. The aim of the encoder is to prove how far
  
  the format can go by writing the craziest encoder for it.
  Right now the encoder’s basic, it only supports CBR encoding, however
  
  internally every single feature the CELT layer has is implemented
  
  (except the pitch pre-filter which needs to work well with the rest of
  
  whatever gets implemented). Psychoacoustic and rate control systems are
  
  under development.
  The encoder takes in frames of 120 samples and depending on the value of
  
  opus_delay the plan is to use the extra buffered frames as lookahead.
  
  Right now the encoder will pick the nearest largest legal frame size and
  
  won’t use the lookahead, but that’ll change once there’s a
  
  psychoacoustic system.
  Even though its a pretty basic encoder its already outperforming
  
  any other native encoder FFmpeg has by a huge amount.
  The PVQ search algorithm is faster and more accurate than libopus’s
  
  algorithm so the encoder’s performance is close to that of libopus
  
  at zero complexity (libopus has more SIMD).
  
  The algorithm might be ported to libopus or other codecs using PVQ in
  
  the future.
  The encoder still has a few minor bugs, like desyncs at ultra low
  
  bitrates (below 9kbps with 20ms frames).
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] configure
  • [DH] libavcodec/Makefile
  • [DH] libavcodec/allcodecs.c
  • [DH] libavcodec/opus_celt.h
  • [DH] libavcodec/opus_pvq.c
  • [DH] libavcodec/opus_pvq.h
  • [DH] libavcodec/opusenc.c

• Anomalie #4048 (Fermé) : Les brèves apparaissent dans la config des mots-clés

  28 septembre 2018, par cedric -

  Pfiou... l’usine à gaz pour gérer ça
  Je propose de considérer que c’est une feature : on configure les mots clés en proposant les objets existants, sans préjuger de ceux réellement utilisés ou non. Ça te permet de dire "si jamais j’utilise les brèves un jour je pourrai y associer des mots clés"

  Bref c’est ultra mineur