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• FFMPEG video conversion for pygame

  19 avril 2016, par Vladimir Shevyakov

  I am currently making a program on python (3) using the pygame module. One of the things I need it to do is to play a video which is currently in AVI format.

  From what I managed to understand from the pygame.movie documentation I have to use FFMPEG and not another program to convert the video to an MPEG (I tried it with NCH Prism and the result was quite memorable).

  I managed to convert my file to an MPG using the sample command found in the pygame.movie documentation (ffmpeg -i <infile> -vcodec mpeg1video -acodec libmp3lame -intra </infile>) but the video quality dropped very much. I tried looking at different cites but they never actually had a working example...

  Is there a way to keep the current video quality ? I don’t really care about the file size...

  Thanks in advance !

• FFMpeg HLS output settings required for Approval by the Apple App Store

  23 mai 2016, par JungleGenius

  I have looked all over, but I have not found a direct answer for my question so far.

  What are the minimum required FFMpeg command line output and segmentation settings that will produce a minimum set of all the required HLS .m3u8 and .ts file combinations needed for Approval by the Apple App Store for a Video file played in an App ?

  Note there are older Q&As on here that were written before FFMpeg added native segmentation for HLS. So I’m looking for 100% FFMpeg solution to output what Apple is looking for. I don’t care about the input format for this answer as FFMpeg reads most any file we would want to use.

  Note the correct answer should take into account the setting for maximum bandwidth requirments for the total stream and etc that Apple looks for.

  I bet someone out there has already got this answered, maybe even running in some code but I want to see it posted to save the rest of us some time.

  Thanks !

• How can i save the preview video in pictureBox1 to a avi/mp4 video file on hard disk using directshow ?

  10 avril 2016, par benny dayag

  The first problem maybe it’s not a problem but for some reason the video preview in the pictureBox1 is working but the frame rate seems not right. I can’t figure how to set/change it. The preview video seems a bit dart to the eyes not flickering but not moving smooth.

  The main problem is how to save the preview in the pictureBox1 or directly the streaming to a video file ? The MediaSubtype i’m getting is h.264

  The video is from the device legato game capture.

  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 DirectShowLib;
  
  using DirectShowLib.BDA;
  
  using DirectShowLib.DES;
  
  using DirectShowLib.DMO;
  
  using DirectShowLib.Dvd;
  
  using DirectShowLib.MultimediaStreaming;
  
  using DirectShowLib.SBE;
  
  using System.Runtime.InteropServices;
  
  using System.Management;
  
  using System.IO;
  
  using System.Drawing.Imaging;
  
  
  
  
  
  namespace Youtube_Manager
  
  {
  
  
  
      public partial class Elgato_Video_Capture : Form
  
      {
  
  
  
  
  
          IFileSinkFilter sink;
  
  
  
          IFilterGraph2 graph;
  
          ICaptureGraphBuilder2 captureGraph;
  
          System.Drawing.Size videoSize;
  
  
  
          string error = "";
  
          List devices = new List();
  
          IMediaControl mediaControl;
  
  
  
          public Elgato_Video_Capture()
  
          {
  
              InitializeComponent();
  
  
  
  
  
  
  
              if (comboBox1.Items.Count == 0)
  
              {
  
                  for (int xx = 1; xx <= 8; xx++)
  
                  {
  
                      comboBox1.Items.Add(xx);
  
                  }
  
              }
  
  
  
              InitDevice();
  
              timer1.Start();
  
          }
  
  
  
          IBaseFilter smartTeeFilter;
  
          IPin outPin;
  
          IPin inPin;
  
          private void InitDevice()
  
          {
  
              try
  
              {
  
                  //Set the video size to use for capture and recording
  
                  videoSize = new Size(827, 505);//1280, 720);
  
  
  
                  //Initialize filter graph and capture graph
  
                  graph = (IFilterGraph2)new FilterGraph();
  
                  captureGraph = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
  
                  captureGraph.SetFiltergraph(graph);
  
                  //Create filter for Elgato
  
                  Guid elgatoGuid = new Guid("39F50F4C-99E1-464A-B6F9-D605B4FB5918");
  
                  Type comType = Type.GetTypeFromCLSID(elgatoGuid);
  
                  IBaseFilter  elgatoFilter = (IBaseFilter)Activator.CreateInstance(comType);
  
                  graph.AddFilter(elgatoFilter, "Elgato Video Capture Filter");
  
  
  
                  //Create smart tee filter, add to graph, connect Elgato's video out to smart tee in
  
                  smartTeeFilter = (IBaseFilter)new SmartTee();
  
  
  
                  graph.AddFilter(smartTeeFilter, "Smart Tee");
  
                  outPin = GetPin(elgatoFilter, "Video");
  
                  inPin = GetPin(smartTeeFilter, "Input");
  
                  SetAndGetAllAvailableResolution(outPin);
  
                  graph.Connect(outPin, inPin);
  
  
  
  
  
                  //Create video renderer filter, add it to graph, connect smartTee Preview pin to video renderer's input pin
  
                  IBaseFilter videoRendererFilter = (IBaseFilter)new VideoRenderer();
  
  
  
                  graph.AddFilter(videoRendererFilter, "Video Renderer");
  
                  outPin = GetPin(smartTeeFilter, "Preview");
  
  
  
                  inPin = GetPin(videoRendererFilter, "Input");
  
                  graph.Connect(outPin, inPin);
  
  
  
                 // int hr = graph.Connect(outPin, inPin); ;
  
                 // DsError.ThrowExceptionForHR(hr);
  
  
  
                  captureGraph.SetOutputFileName(MediaSubType.Avi, @"e:\screenshots\test1.mp4", out smartTeeFilter, out sink);
  
  
  
                  //Render stream from video renderer
  
                  captureGraph.RenderStream(PinCategory.VideoPort, MediaType.Video, videoRendererFilter, null, null);
  
                  //Set the video preview to be the videoFeed panel
  
                  IVideoWindow vw = (IVideoWindow)graph;
  
                  vw.put_Owner(pictureBox1.Handle);
  
                  vw.put_MessageDrain(this.Handle);
  
                  vw.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipSiblings | WindowStyle.ClipChildren);
  
                  vw.SetWindowPosition(0, 0, 827, 505);
  
  
  
                  //Start the preview
  
                  mediaControl = graph as IMediaControl;
  
                  mediaControl.Run();
  
              }
  
              catch (Exception err)
  
              {
  
                  error = err.ToString();
  
              }
  
          }
  
  
  
           IPin GetPin(IBaseFilter filter, string pinname)
  
          {
  
              IEnumPins epins;
  
              int hr = filter.EnumPins(out epins);
  
              checkHR(hr, "Can't enumerate pins");
  
              IntPtr fetched = Marshal.AllocCoTaskMem(4);
  
              IPin[] pins = new IPin[1];
  
              while (epins.Next(1, pins, fetched) == 0)
  
              {
  
                  PinInfo pinfo;
  
                  pins[0].QueryPinInfo(out pinfo);
  
                  bool found = (pinfo.name == pinname);
  
                  DsUtils.FreePinInfo(pinfo);
  
                  if (found)
  
                      return pins[0];
  
              }
  
              checkHR(-1, "Pin not found");
  
              return null;
  
          }
  
  
  
          public  void checkHR(int hr, string msg)
  
          {
  
              if (hr < 0)
  
              {
  
                  MessageBox.Show(msg);
  
                  DsError.ThrowExceptionForHR(hr);
  
              }
  
  
  
  
  
  
  
          }
  
  
  
          public void SetAndGetAllAvailableResolution(IPin VideoOutPin)
  
          {
  
              int hr = 0;
  
              IAMStreamConfig streamConfig = (IAMStreamConfig)VideoOutPin;
  
              AMMediaType searchmedia;
  
              AMMediaType CorectvidFormat = new AMMediaType();
  
              IntPtr ptr;
  
              int piCount, piSize;
  
              hr = streamConfig.GetNumberOfCapabilities(out piCount, out piSize);
  
              ptr = Marshal.AllocCoTaskMem(piSize);
  
              for (int i = 0; i < piCount; i++)
  
              {
  
                  hr = streamConfig.GetStreamCaps(i, out searchmedia, ptr);
  
                  VideoInfoHeader v = new VideoInfoHeader();
  
  
  
                  Marshal.PtrToStructure(searchmedia.formatPtr, v);
  
                  if (i == 2)// 4
  
                  {
  
                      CorectvidFormat = searchmedia;
  
                  }
  
              }
  
              hr = streamConfig.SetFormat(CorectvidFormat);
  
  
  
              IntPtr pmt = IntPtr.Zero;
  
              AMMediaType mediaType = new AMMediaType();
  
              IAMStreamConfig streamConfig1 = (IAMStreamConfig)VideoOutPin;
  
              hr = streamConfig1.GetFormat(out mediaType);
  
              BitmapInfoHeader bmpih = new BitmapInfoHeader();
  
              Marshal.PtrToStructure(mediaType.formatPtr, bmpih);
  
          }
  
    }
  
  } 

  I tried to use this line to save the video to a video file but the video file on hard disk is 0 KB so I guess it’s a wrong way to do it.
  I also thought somehow to save each frame(bitmap image) from the pictureBox1 to the hard disk or maybe the memory and use ffmpeg to create/build a video file in real time from each saved frame but I can’t get/save the images(frames) from the pictureBox1 for some reason.

  I tried using DrawToBitmap but all the frames(bitmaps on hard disk saved) are empty size 2.24 KB

  captureGraph.SetOutputFileName(MediaSubType.Avi, @"e:\screenshots\test1.mp4", out smartTeeFilter, out sink);

  This is how I tried to get the frames from the pictureBox1

  public static int counter = 0;
  
          private void timer1_Tick(object sender, EventArgs e)
  
          {
  
              counter++;
  
              Bitmap bmp = new Bitmap(pictureBox1.ClientSize.Width, pictureBox1.ClientSize.Height);
  
              pictureBox1.DrawToBitmap(bmp, pictureBox1.ClientRectangle);
  
              bmp.Save(@"e:\screenshots\" + "screenshot" + counter.ToString("D6") + ".bmp");
  
              bmp.Dispose();
  
          }