Recherche avancée

Sur d’autres sites (11664)

• how to make ffmpeg process large files faster ?

  12 octobre 2019, par Hakim Douib

  I am using ffmpeg to view video for dash player. But the videos used are more than 1GB, and the server has
  60 GB of RAM
  Ten cores

  The server takes more than 50 hours to process a video.
  The method I use is by separating each operation thread to make it faster ,
  and the files in the end have size between 2 to 5 GB

  dash params variable

  VP9_DASH_PARAMS="-tile-columns 4 -frame-parallel 1"

  cmd :

  ffmpeg  -i  vid_origenal.mp4 -c:v libx265  -s 1920x1080 -b:v 3000k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1  1080.webm >/dev/null 2>&1 &

  I use this for all qualities

  thanks

• When using ffmpeg to compress and create in real time mpeg4 video file from bathc of images getting low quality video how can i improve quality ?

  30 juin 2015, par Brubaker Haim

  The goal here is to create a compressed mp4 video file in real time. I’m saving screenshots as bitmaps type on my hard disk. And i want to create mp4 file and compress the mp4 video file in real time.

  using System;
  
  using System.Windows.Forms;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Drawing;
  
  using System.IO.Pipes;
  
  using System.Runtime.InteropServices;
  
  using System.Diagnostics;
  
  using System.IO;
  
  using DannyGeneral;
  
  
  
  namespace Youtube_Manager
  
  {
  
      class Ffmpeg
  
      {
  
          NamedPipeServerStream p;
  
          String pipename = "mytestpipe";
  
          System.Diagnostics.Process process;
  
          string ffmpegFileName = "ffmpeg.exe";
  
          string workingDirectory;
  
  
  
          public Ffmpeg()
  
          {
  
              workingDirectory = Path.GetDirectoryName(Application.ExecutablePath);
  
              Logger.Write("workingDirectory: " + workingDirectory);
  
              if (!Directory.Exists(workingDirectory))
  
              {
  
                  Directory.CreateDirectory(workingDirectory);
  
              }
  
              ffmpegFileName = Path.Combine(workingDirectory, ffmpegFileName);
  
              Logger.Write("FfmpegFilename: " + ffmpegFileName);
  
          }
  
  
  
          public void Start(string pathFileName, int BitmapRate)
  
          {
  
              try
  
              {
  
  
  
                  string outPath = pathFileName;
  
                  p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
                  ProcessStartInfo psi = new ProcessStartInfo();
  
                  psi.WindowStyle = ProcessWindowStyle.Hidden;
  
                  psi.UseShellExecute = false;
  
                  psi.CreateNoWindow = false;
  
                  psi.FileName = ffmpegFileName;
  
                  psi.WorkingDirectory = workingDirectory;
  
                  psi.Arguments = @"-f rawvideo -vcodec rawvideo -pix_fmt rgb24 -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;
  
                  process = Process.Start(psi);
  
                  process.EnableRaisingEvents = false;
  
                  psi.RedirectStandardError = true;
  
                  p.WaitForConnection();
  
              }
  
              catch (Exception err)
  
              {
  
                  Logger.Write("Exception Error: " + err.ToString());
  
              }
  
          }
  
  
  
          public void PushFrame(Bitmap bmp)
  
          {
  
              try
  
              {
  
                  int length;
  
                  // Lock the bitmap's bits.
  
                  //bmp = new Bitmap(1920, 1080);
  
                  Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
  
                  //Rectangle rect = new Rectangle(0, 0, 1280, 720);
  
                  System.Drawing.Imaging.BitmapData bmpData =
  
                      bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
  
                      bmp.PixelFormat);
  
  
  
                  int absStride = Math.Abs(bmpData.Stride);
  
                  // Get the address of the first line.
  
                  IntPtr ptr = bmpData.Scan0;
  
  
  
                  // Declare an array to hold the bytes of the bitmap.
  
                  //length = 3 * bmp.Width * bmp.Height;
  
                  length = absStride * bmpData.Height;
  
                  byte[] rgbValues = new byte[length];
  
  
  
                  //Marshal.Copy(ptr, rgbValues, 0, length);
  
                  int j = bmp.Height - 1;
  
                  for (int i = 0; i < bmp.Height; i++)
  
                  {
  
                      IntPtr pointer = new IntPtr(bmpData.Scan0.ToInt32() + (bmpData.Stride * j));
  
                      System.Runtime.InteropServices.Marshal.Copy(pointer, rgbValues, absStride * (bmp.Height - i - 1), absStride);
  
                      j--;
  
                  }
  
                  p.Write(rgbValues, 0, length);
  
                  bmp.UnlockBits(bmpData);
  
              }
  
              catch(Exception err)
  
              {
  
                  Logger.Write("Error: " + err.ToString());
  
              }
  
  
  
          }
  
  
  
          public void Close()
  
          {
  
              p.Close();
  
          }
  
      }
  
  }

  The Bitmaps images files on my hard disk each one is 1920x1080 and Bit depth 32.

  The video file is on the hard disk at size 1.24MB

  This is a screenshot i took from the video file when playing it.
  You can see how bad the quality is.

  

  This is a link for 10 images of the screenshots i’m using creating from the video file. They are Bitmaps.

  Screenshots rar

  Its something with the arguments :
  This line dosen’t work when i run the program the command prompt window close at once. I can’t even see if there is any erorr/s the command prompt window close too fast.

  psi.Arguments = @"-f libx264 -vcodec libx264 -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;

  When i’m using this arguments it’s working but making bad quality video :

  psi.Arguments = @"-f rawvideo -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;

• FFMPG Concat two video quality issue

  14 novembre 2019, par Salah Hammouda

  I’m trying to concat two mp4 video files using ffmpg (with the below command), a main video and a secondary one, the main video always have 1080x1920 resolution and the resulting video should have the some resolution.

  val concat = "-i $mainVideoPath -i $secondVideoPath -filter_complex [0:v]scale=1080:1920:force_original_aspect_ratio=decrease,setsar=1:1,pad=1080:1920 :(ow-iw)/2 :(oh-ih)/2[s0] ;[1:v]scale=1080:1920:force_original_aspect_ratio=decrease,setsar=1:1,pad=1080:1920 :(ow-iw)/2 :(oh-ih)/2[s1] ;[s0][s1]concat=n=2:v=1[v] -map [v] $resultVideoPath"

  The concat work fine but the main part of my resulting video always lose quality although the resulting video has the same resolution.

  Any help will be appreciated.