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• Working with FFMPEG and C#

  23 septembre 2016, par fauvent

  I have been trying to develop a C# app for a long time now which is intended to run on a server. It takes info from a data base and makes a video with it. I have been using libraries for that porpuse (Aforge). But now it looks like I HAVE to use FFMPEG to combine 5 mp4 in one. My question would be :

  1. Do I have to "execute" the exe file from the download to make it work ? Or I can simply use the dll like the other libraries (like Aforge) ?

  2. FFMPEG looks very complicated to me. I have been trying to use Splicer insted. There is a very nice and clean example that I would love to use. But I can’t get Splicer to work. I am using VS 13. How exaclty I get Splicer working ? Adding the dlls to the "debug folder" then just adding the reference ? If so which dlls ?

  This is my code so far. It does not show any errors but it does not do anything (I added the reference and the splicer.dll to my project)

  using System;
  
  using System.Collections.Generic;
  
  using System.ComponentModel;
  
  using System.Data;
  
  using System.Drawing;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Windows.Forms;
  
  using Splicer;
  
  using Splicer.Renderer;
  
  using Splicer.Timeline;
  
  
  
  namespace MergeVideos
  
  {
  
      public partial class Form1 : Form
  
      {
  
          public Form1()
  
          {
  
              InitializeComponent();
  
          }
  
  
  
          private void Form1_Load(object sender, EventArgs e)
  
          {
  
  
  
              string firstVideoFilePath = @"C:\Users\Nicci\Desktop\santa\profile.mp4";
  
              string secondVideoFilePath = @"C:\Users\Nicci\Desktop\santa\santa_vid.mp4";
  
              string outputVideoPath = @"C:\Users\Nicci\Desktop\santa\output.mp4";
  
  
  
              using (ITimeline timeline = new DefaultTimeline())
  
              {
  
                  IGroup group = timeline.AddVideoGroup(32, 720, 576);
  
  
  
                  var firstVideoClip = group.AddTrack().AddVideo(firstVideoFilePath);
  
                  var secondVideoClip = group.AddTrack().AddVideo(secondVideoFilePath, firstVideoClip.Duration);
  
  
  
                  using (AviFileRenderer renderer = new AviFileRenderer(timeline, outputVideoPath))
  
                  {
  
                      renderer.Render();
  
                  }
  
              }
  
  
  
          }
  
      }
  
  }

  Thanks in advance !

• Java/OpenCV - How to do a lossless h264 video writing in openCV ?

  15 août 2018, par JohnDoeAnon

  in the last time I had some struggle with the VideoWriter in openCV under java. I want to write a video file in a *.mp4 container with h.264 codec - but I see no option to toggle bitrate or quality in openCV VideoWriter. I did build openCV with ffmpeg as backend. I just want to write the video file in exact quality values as the original input video.
  I also have some code to do the job

  import org.opencv.core.Mat;
  
  import org.opencv.core.Size;
  
  import org.opencv.videoio.VideoWriter;
  
  import org.opencv.videoio.Videoio;
  
  
  
  public class VideoOutput
  
  {
  
       private final int H264_CODEC = 33;
  
  
  
       private VideoWriter writer;
  
  
  
       private String filename;
  
  
  
       public VideoOutput (String filename)
  
       {
  
          writer = null;
  
  
  
          this.filename = filename;
  
      }
  
  
  
      public void initialize(double framesPerSecond, int height, int width) throws Exception
  
      {
  
  
  
          this.writer = new VideoWriter();
  
  
  
          this.writer.open(filename, H264_CODEC, framesPerSecond, new Size(width, height));
  
  
  
          if(!writer.isOpened())
  
          {
  
               Logging.LOGGER.severe("Could not create video output file " + filename + "\n");
  
  
  
               throw new Exception("Could not create video output file " + filename + "\n");
  
          }
  
      }
  
  
  
      public void setFrame(VideoFrame videoFrame) throws Exception
  
      {
  
           if (writer.isOpened()) 
  
           {
  
               Mat frame = ImageUtil.imageToMat(videoFrame.getFrame());
  
  
  
               writer.write(frame);
  
  
  
               frame.release();
  
           }
  
      }

  I hoped the VideoWriter gives some options to do the job but it seems not the way.

  So is there an option or flag that I am missing for lossless h264 video writing under openCV and java OR maybe there is another way to do this ?
  Please help me - if you have done this already I really would appreciate some example code to get things done.

  UPDATE

  I do have now a solution that fits for my application, so here it is :

  String fps = Double.toString(this.config.getInputConfig().getFramesPerSecond());
  
  
  
  Runtime.getRuntime().exec(
  
          new String[] {
  
          "C:\\ffmpeg-3.4.2-win64-static\\bin\\ffmpeg.exe",
  
          "-framerate",
  
          fps,
  
          "-i",
  
          imageOutputPath + File.separator +  "%01d.jpg",
  
          "-c:v",
  
          "libx265",
  
          "-crf",
  
          "1",
  
          imageOutputPath + File.separator +  "ffmpeg.mp4"
  
          }
  
      );

  Credits to @Gyan who gave me the correct ffmpeg call in this post :

  Win/ffmpeg - How to generate a video from images under ffmpeg ?

  Greets

• How to format string the ffmpeg arguments to pass the arguments to a textBox ?

  28 juin 2022, par Sharo SA

  I created this form :

  


  

  


  I want to use the variable ffmpegArguments to pass the arguments from the textBox to the ffmpeg class arguments. the problem is that in the ffmpeg class i'm using the variables :

  


  FileName and Framerate so how can i format the input from the textBox to the ffmpeg arguments with the FileName and Framerate variables ?

  


  In the ffmpeg class :

  


  using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Capture_Screen
{
    internal class FFmpeg_Capture
    {
        public string workingDirectory;
        public string outputDirectory;
        public string ffmpegArguments;

        private Process process;

        public FFmpeg_Capture()
        {
            
        }

        public void Start(string FileName, int Framerate)
        {
            process = new Process();
            process.StartInfo.FileName = outputDirectory; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = workingDirectory; // The output directory  
            process.StartInfo.Arguments = @"-y -f gdigrab -framerate " + Framerate +
                " -i desktop -preset ultrafast -pix_fmt yuv420p " + FileName;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardInput = true; //Redirect stdin
            process.StartInfo.CreateNoWindow = true;
            process.Start();
        }

        public void Stop()
        {
            byte[] qKey = Encoding.GetEncoding("gbk").GetBytes("q"); //Get encoding of 'q' key
            process.StandardInput.BaseStream.Write(qKey, 0, 1); //Write 'q' key to stdin of FFmpeg sub-processs
            process.StandardInput.BaseStream.Flush(); //Flush stdin (just in case).
            process.Close();
            process.Dispose();
        }
    }
}