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How to record a video source to mp4

(this requires the Datastead Multipurpose Encoder to be installed)

The typical sample code to record in MP4 is, e.g.:

#define ENCODER_RECORDING_ID 0 // the encoder with ID 0 is the TVideoGrabber’s embedded encoder, this will never change

VideoGrabber.VideoDevice = VideoGrabber.VideoDeviceIndex (“c922 Pro Stream Webcam”); (1)

VideoGrabber.AudioDevice = VideoGrabber.AudioDeviceindex (“Microphone (C922 Pro Stream Webcam)”);

VideoGrabber.VideoCompressor = VideoCompressorIndex (“Datastead Multipurpose Encoder”);

VideoGrabber.AudioCompressor = AudioCompressorIndex (“Datastead Multipurpose Encoder”);

VideoGrabber.Encoder_SetInt (ENCODER_RECORDING_ID, Enc_Video_Bitrate_kb, 2000); (2)

VideoGrabber.Encoder_SetStr (ENCODER_RECORDING_ID, Enc_Video_Codec, “hevc”);

VideoGrabber.Encoder_SetInt (ENCODER_RECORDING_ID, Enc_Video_Thread_Count, 4); // default 1

// VideoGrabber.Encoder_SetInt (ENCODER_RECORDING_ID, Enc_Video_GPU_Encoder, integer (Enc_GPU_NVidia_NVENC)); to enable the GPU encoding through NVidia (to select any GPU available set Enc_GPU_Auto)

VideoGrabber.Encoder_SetStr (ENCODER_RECORDING_ID, Enc_Audio_Codec, “aac”);

VideoGrabber.RecordingMethod = rm_MP4; // to generate the file name automatically (3)

// VideoGrabber.RecordingFileName = “VideoClip.mp4”; // if the file name is specified, it determines the recording method, no need to set RecordingMethod above

VideoGrabber.AudioRecording = true;

VideoGrabber.CompressionMode = cm_CompressOnTheFly;



In the MainDemo project:
(1) “video source” tab
(2) “multipurpose” tab
(3) “recording” tab


Once started, the recording can be paused by invoking:


and resumed by invoking:



During the recording, it is possible to start recording to a new file by invoking:

VideoGrabber.RecordToNewFileNow (“”);


VideoGrabber.RecordToNewFileNow (“c:\folder\thenewfilename.mp4”);

(if no file name is specified, the new file is created automatically in the VideoGrabber.StoragePath folder)

More information here.

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