VideoFrequency Property

Gets the video frequency, in Hertz, for the current channel.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public ReadOnly Property VideoFrequency As Integer

'Usage
 
Dim instance As TVTuner
Dim value As Integer
 
value = instance.VideoFrequency

public int VideoFrequency {get;}

public:
property int VideoFrequency {
   int get();
}

Property Value

A value that represents the video frequency, in Hertz.

Remarks

Gets the video frequency, in Hertz, for the current channel. For more detailed information, refer to the Microsoft documentation for IAMTVTuner.get_VideoFrequency.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public Sub AnalogTVTunerExample()
   ' reference the forms capture control and tv tuner
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "TVTuner_AnalogTVTunerExample.avi")
   Dim testChan As Integer = 6
   Dim channel As Integer

   Try
      ' select the first device with analog in it's name
      ' Replace "Analog" with your video capture device name
      If capturectrl.VideoDevices("Analog") Is Nothing Then
         Throw New Exception("No Analog video devices available!")
      End If

      capturectrl.VideoDevices("Analog").Selected = True

      ' use the video capture device's audio
      capturectrl.UseVideoDeviceAudio = True

      ' get the TV Tuner device
      Dim tvtuner As TVTuner = capturectrl.TVTuner

      ' Check if TV tuner is valid
      If Not tvtuner Is Nothing Then
         ' set the input type to cable and set the channel
         tvtuner.SetInputType(0, TunerInputType.Cable)
         tvtuner.SetChannel(testChan, -1, -1)

         ' get the Video and Audio frequency
         Dim vidFreq As Integer = tvtuner.VideoFrequency
         Dim audFreq As Integer = tvtuner.AudioFrequency
      End If

      ' set the output file
      capturectrl.TargetFile = outFile

      ' set the video and audio compressors
      capturectrl.VideoCompressors.Mpeg2.Selected = True
      capturectrl.AudioCompressors.AC3.Selected = True

      ' check if we have can capture video
      If capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio) Then
         ' set the target format
         capturectrl.TargetFormat = TargetFormatType.AVI

         capturectrl.TimeLimit = 10 ' just 10 seconds of capture time
         capturectrl.UseTimeLimit = True

         ' select the video subtype
         capturectrl.VideoCaptureSubTypes(Leadtools.Multimedia.Constants.MEDIASUBTYPE_YUY2).Selected = True

         ' start the capture
         capturectrl.StartCapture(CaptureMode.VideoAndAudio)

         ' we'll loop on the state and pump messages for this example.
         ' but you should not need to if running from a Windows Forms application.
         Do While capturectrl.State = CaptureState.Running
            Application.DoEvents()
         Loop

         ' if TV tuner is valid
         If Not tvtuner Is Nothing Then
            ' check the channel
            channel = tvtuner.Channel

            ' and set the result to what we expect
            _result = (channel = testChan)
         End If
      End If
   Catch e1 As Exception
      _result = False
   End Try
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media"
End Class

using Leadtools;
using Leadtools.Multimedia;
using LeadtoolsMultimediaExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void AnalogTVTunerExample()
{
   // reference the forms capture control and tv tuner
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   string outFile =Path.Combine(LEAD_VARS.MediaDir,"TVTuner_AnalogTVTunerExample.avi");
   int testChan = 6;
   int channel;

   try
   {
      // select the first device with analog in it's name
      // Replace "Analog" with your video capture device name
      if (capturectrl.VideoDevices["Analog"] == null)
         throw new Exception("No Analog video devices available!");

      capturectrl.VideoDevices["Analog"].Selected = true;

      // use the video capture device's audio
      capturectrl.UseVideoDeviceAudio = true;

      // get the TV Tuner device
      TVTuner tvtuner = capturectrl.TVTuner;

      // check whether the TV tuner is valid
      if (tvtuner != null)
      {
         // set the input type to cable and set the channel
         tvtuner.SetInputType(0, TunerInputType.Cable);
         tvtuner.SetChannel(testChan, -1, -1);

         // get the Video and Audio frequency
         int vidFreq = tvtuner.VideoFrequency;
         int audFreq = tvtuner.AudioFrequency;
      }

      // set the output file
      capturectrl.TargetFile = outFile;

      // set the video and audio compressors
      capturectrl.VideoCompressors.Mpeg2.Selected = true;
      capturectrl.AudioCompressors.AC3.Selected = true;

      // check whether we can capture video
      if (capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio))
      {
         // set the target format
         capturectrl.TargetFormat = TargetFormatType.AVI;

         capturectrl.TimeLimit = 10;     // just 10 seconds of capture time
         capturectrl.UseTimeLimit = true;

         // select the video subtype
         capturectrl.VideoCaptureSubTypes[Constants.MEDIASUBTYPE_YUY2].Selected = true;

         // start the capture
         capturectrl.StartCapture(CaptureMode.VideoAndAudio);

         // we'll loop on the state and pump messages for this example.
         // but you should not need to if running from a Windows Forms application.
         while (capturectrl.State == CaptureState.Running)
            Application.DoEvents();

         // if TV tuner is valid
         if (tvtuner != null)
         {
            // check the channel
            channel = tvtuner.Channel;

            // and set the result to what we expect
            _result = (channel == testChan);
         }
      }
   }
   catch (Exception)
   {
      _result = false;
   }
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media";
}

Requirements

Target Platforms

Reference

TVTuner Class
TVTuner Members