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• 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();
  
          }

• FFmpeg trim .3gp and save as .mp4 not working

  11 avril 2016, par SebSob

  I am trying to trim a video input .3gp (http://www.sample-videos.com/video/3gp/144/big_buck_bunny_144p_2mb.3gp) and save it as .mp4, this is my command :

  ffmpeg -ss 00:00:00.000 -y -i input_vid.3gp -strict experimental -preset ultrafast -t 00:00:03.637 -r 30 -s 176x144 -ar 44100 -b:v 4000k -minrate 4000k -maxrate 4000k -c:a copy -vcodec mpeg4 output_vid.mp4

  But it gives me the following error :

  Setting 'pix_fmts' to value 'yuv420p'
  
  query_formats: 7 queried, 6 merged, 0 already done, 0 delayed
  
  w:176 h:144 fmt:yuv420p sar:12/11 -> w:176 h:144 fmt:yuv420p sar:12/11 flags:0x4
  
  Automatically choosing VBV buffer size of 232 kbyte
  
  intra_quant_bias = 0 inter_quant_bias = -64
  
  Could not find tag for codec amr_nb in stream #1, codec not currently supported in container
  
  Output #0, mp4, to 'output_vid.mp4':
  
    Metadata:
  
      major_brand     : 3gp4
  
      minor_version   : 512
  
      compatible_brands: isomiso23gp4
  
      encoder         : Lavf56.23.100
  
      Stream #0:0(und), 0, 1/15360: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 176x144 [SAR 12:11 DAR 4:3], q=2-31, 4000 kb/s, 30 fps, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.25.100 mpeg4
  
      Stream #0:1(und), 0, 1/8000: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, 12 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h263 (native) -> mpeg4 (native))
  
    Stream #0:1 -> #0:1 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  exit_program: 1 

  But it works fine if the input is an .mp4...

  Any idea’s ? Thanks

• avformat/mov : don't save a copy of the packet's AVBufferRef on DV streams

  2 mai 2021, par James Almer

  avformat/mov : don't save a copy of the packet's AVBufferRef on DV streams
  It's no longer needed.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/mov.c