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Video capture to custom format

Currently, there are several options for connecting third-party DirectShow filters for you to be able to get the necessary format.

First option

An audio codec, a video codec and a multiplexer - different filters You can use both DS filters and regular codecs as codecs.

Second option

A multiplexer, a video codec and an audio codec – one and the same filter.

Another difference is whether the filter can write to a file itself, or you should use the standard File Writer filter, or you need another special filter.

In the first two cases, VisioForge Video Capture will detect it automatically and set the necessary parameters, but you have to specify the necessary filter yourself in the third case.

And now let us see what the code for different options looks like.

 

Select video and audio capture devices

Select needed video input (configure crossbar)

Select audio output

 

First option

 

Get lists of audio and video codecs

Delphi for I := 0 to VideoCapture1.Video_Codecs_GetCount - 1 do
cbCustomVideoCodec.Items.Add(VideoCapture1.Video_Codecs_GetItem(i));

for I := 0 to VideoCapture1.Audio_Codecs_GetCount - 1 do
cbCustomAudioCodec.Items.Add(VideoCapture1.Audio_Codecs_GetItem(i));
C++/C# for (int i = 0; i < VideoCapture1.Video_Codecs_GetCount(); i++)
cbCustomVideoCodecs.Items.Add(VideoCapture1.Video_Codecs_GetItem(i));

for (int i = 0; i < VideoCapture1.Audio_Codecs_GetCount(); i++)
cbCustomAudioCodecs.Items.Add(VideoCapture1.Audio_Codecs_GetItem(i));

 

Get list of DirectShow filters

Delphi for I := 0 to VideoCapture1.DirectShow_Filters_GetCount - 1 do
begin
cbCustomDSFilterV.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomDSFilterA.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomMuxer.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomFilewriter.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
end;
C++/C# for (int i = 0; i < VideoCapture1.DirectShow_Filters_GetCount(); i++)
{
cbCustomDSFilterA.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomDSFilterV.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomMuxer.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomFilewriter.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
}

 

Select filters and codecs

Delphi if rbCustomUseVideoCodecsCat.Checked then
begin
VideoCapture1.Custom_Output_Video_Codec := cbCustomVideoCodec.Items[cbCustomVideoCodec.ItemIndex];
VideoCapture1.Custom_Output_Video_Codec_Use_Filters_Category := false;
end
else
begin
VideoCapture1.Custom_Output_Video_Codec := cbCustomDSFilterV.Items[cbCustomDSFilterV.ItemIndex];
VideoCapture1.Custom_Output_Video_Codec_Use_Filters_Category := true;
end;

if rbCustomUseAudioCodecsCat.Checked then
begin
VideoCapture1.Custom_Output_Audio_Codec := cbCustomAudioCodec.Items[cbCustomAudioCodec.ItemIndex];
VideoCapture1.Custom_Output_Audio_Codec_Use_Filters_Category := false;
end
else
begin
VideoCapture1.Custom_Output_Audio_Codec := cbCustomDSFilterA.Items[cbCustomDSFilterA.ItemIndex];
VideoCapture1.Custom_Output_Audio_Codec_Use_Filters_Category := true;
end;

VideoCapture1. Custom_Output_Mux_Filter_Name := cbCustomMuxer.Items[cbCustomMuxer.ItemIndex];
C++/C# if (rbCustomUseVideoCodecsCat.Checked)
{
VideoCapture1.Custom_Output_Video_Codec = cbCustomVideoCodecs.Text;
VideoCapture1.Custom_Output_Video_Codec_Use_Filters_Category = false;
}
else
{
VideoCapture1.Custom_Output_Video_Codec = cbCustomDSFilterV.Text;
VideoCapture1.Custom_Output_Video_Codec_Use_Filters_Category = true;
};

if (rbCustomUseAudioCodecsCat.Checked)
{
VideoCapture1.Custom_Output_Audio_Codec = cbCustomAudioCodecs.Text;
VideoCapture1.Custom_Output_Audio_Codec_Use_Filters_Category = false;
}
else
{
VideoCapture1.Custom_Output_Audio_Codec = cbCustomDSFilterA.Text;
VideoCapture1.Custom_Output_Audio_Codec_Use_Filters_Category = true;
};

VideoCapture1.Custom_Output_Mux_Filter_Name = cbCustomMuxer.Text;

 

Second option

Get lists of DirectShow filters.

Delphi for I := 0 to VideoCapture1.DirectShow_Filters_GetCount - 1 do
begin
cbCustomDSFilterV.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomDSFilterA.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomMuxer.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomFilewriter.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
end;
C++/C# for (int i = 0; i < VideoCapture1.DirectShow_Filters_GetCount(); i++)
{
cbCustomDSFilterA.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomDSFilterV.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomMuxer.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
cbCustomFilewriter.Items.Add(VideoCapture1.DirectShow_Filters_GetItem(i));
}

 

Select multiplexer (mux) filter

Delphi VideoCapture1.Custom_Output_Mux_Filter_Name := cbCustomMuxer.Items[cbCustomMuxer.ItemIndex];
VideoCapture1.Custom_Output_Mux_Filter_Is_Encoder := cbCustomMuxFilterIsEncoder.Checked;
C++/C# VideoCapture1.Custom_Output_Mux_Filter_Name = cbCustomMuxer.Text;
VideoCapture1.Custom_Output_Mux_Filter_Is_Encoder = cbCustomMuxFilterIsEncoder.Checked;

 

If you need a special File Writer filter, you should specify it. It is true for both options described above.

Delphi VideoCapture1.Custom_Output_Special_FileWriter_Needed := cbUseSpecialFilewriter.Checked;  VideoCapture1.Custom_Output_Special_FileWriter_Filter_Name := cbCustomFilewriter.Items[cbCustomFilewriter.ItemIndex];
C++/C# VideoCapture1.Custom_Output_Special_FileWriter_Needed = cbUseSpecialFilewriter.Checked;  VideoCapture1.Custom_Output_Special_FileWriter_Filter_Name = cbCustomFilewriter.Text;

 

Start capture

Delphi VideoCapture1.Start;
C++/C# VideoCapture1.Start();

 

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