FAQ

TVideoGrabber Video SDK

• Black video window through the Remote Desktop or virtual machines (VMs)
• Multiple instances fail to start and/or "Out of Memory" error
• Windows Server pre-requisties
• Windows 10 N pre-requisties

• New Datastead Encoder

  • How can I pass FFMpeg options to the new Encoder, e.g. "-movflags empty_moov -strict experimental -frag_duration 4000"?

• Codecs

  • Recommended decoder
  • Why some codecs do not appear in the "video compressors" list when I recompile the application for x64?

• Video window

  • The aspect ratio is not what I need
  • Moving the video window between 2 monitors raises an error

• Video capture devices

  • Many dropped frames during recording
  • How can I connect a Basler GigE camera?
  • Is the Still Image Pin capture supported?
  • How to apply overlays and perform hardware encoding with the Sensoray 2253 / 3364
  • Avermedia HD Capture: no video when capturing the HDMI input
  • How to use a Ricoh Theta X?

• Player

  • Playback quality deteriorated or slowed-down when playing big compressed files

• Mixer

  • Mixer: how I can set the mixer video output size? my cameras are configured as 1280x720, but the output file is 320x240.

• Audio

  • How to get the raw audio samples from the audio capture device, without audio recording nor rendering
  • No audio when invoking StartPreview() or StartRecording()
  • Enabling audio with IP cameras and URL sources
  • How to record an IP camera with audio from the PC soundboard or a webcam?

• Overlays

  • SetTextOverlay... vs OverlaySelector
  • How to draw a cross-hair over video frames and move it with the mouse?

• C++Builder

  • When debugging and exiting the app, the debugger reports: warning unknown heap name 0x08000000 / 0x08000000 - Error detected (ILI4581)
  • When invoking TextOut from the OnFrameBitmap event, how to change the font size?
  • C++Builder compilation: ilink32 error unresolved when trying to compile
  • C++Builder : compilation error when connecting the OnFrameCaptureCompleted event

• C# & VB.NET

  • When trying to install the component on the toolbox I get a "type library could not be loaded" error

• VC++

  • how to make the video window visible in a MFC application
  • My code that capture frames in burst mode in a GUI application, does not work in a console application
  • When invoking TextOut from the OnFrameBitmap event, how to change the font size?

• Recording

  • how to record the screen in 4K
  • How to record a video source to mp4
  • I specify the HEVC codec with VideoGrabber.Encoder_SetStr(Enc_Video_Codec, "hevc"), but the video is recorded in H264.

• IP cameras / URL sources

  • I am not able to play a RTP stream, e.g. rtp://239.255.0.1:10124
  • The connection to a RTSP URL always fails
  • Example of ONVIF and PTZ protocol
  • ONVIF PTZ not working with some IP cameras
  • RTSP not working with Reolink IP cameras
  • IP cameras: how to get the current NTP time for each video frame
  • HTTP URL in MJPEG format not working
  • How to record an IP camera with audio from the PC soundboard or a webcam?

• Streaming

  • How to send the video to Open Broadcaster Software? (OBS)
  • How to enable UDP streaming through the Multipurpose Encoder?

• Delphi / C++ Builder

  • Error Reading Form : Error reading <i>PropertyName</i>: Property <i>PropertyName</i> does not exist. Ignore the error and continue? NOTE: Ignoring the error may cause components to be deleted or property values to be lost.
  • When I upgrade my project to Delphi 12 Athens some events are disconnected because of different variable types

• Sample code

  • How to display an image over the live RTSP preview

c# & VB.NET

• when I create a bitmap from the OnFrameBitmap event, an error occurs after a few seconds
• how to make the video window visible in a MFC application
• After renaming "VideoGrabberNET.dll", I get errors: "could not load file or assembly 'VideoGrabberNET..." or "System.IO.FileNotFoundException: Could not load file or assembly"
• How can I program screen capture using C#
• Convert a video frame to Bitmap from the OnFrameBitmap event
• When invoking ONVIFSnapshot, how to get the JPEG data from the OnRawVideoSample event in VB.NET?
• "VideoGrabberNET ... failed to load" error at startup
• .NET error "could not load file or assembly System.Windows.Form"
• .NET error "could not load file or assembly PresentationCore or PresentationFramework"

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RTSP/RTMP/HTTP/ONVIF DirectShow Source Filter

• Excessive latency with RTSP/H264 stream
• ONVIF connection fails
• What port should I use for ONVIF?
• ONVIF PTZ not working with some IP cameras
• RTSP not working with Reolink IP cameras
• Invoking Action(RTSP_Action_RecordToNewFileNow, ...) returns and error 0x8007139F
• Many dropped frames during recording
• I am not able to play a RTP stream, e.g. rtp://239.255.0.1:10124
• How to open a SDP stream?
• The connection to a RTSP URL always fails
• Multiple instances fail to start and/or "Out of Memory" error
• How to capture each video frame decoded in real time
• On Windows Server 2008 or 2012 the RTSP/RTMP/HTTP/ONVIF Source fails to install or does not work
• Windows Server pre-requisties
• Windows 10 N pre-requisties
• IP cameras: how to get the current NTP time for each video frame
• HTTP URL in MJPEG format not working

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Multipurpose DirectShow Encoder

• how to record the screen in 4K
• how to push to a Wowza server?
• how can I hide the console displaying the log?
• The encoding fails when using NVidia NVENC as hardware acceleration for recording
• How to record a video source to mp4
• Windows 10 N pre-requisties
• I specify the HEVC codec with VideoGrabber.Encoder_SetStr(Enc_Video_Codec, "hevc"), but the video is recorded in H264.
• How to enable UDP streaming through the Multipurpose Encoder?
• Building a DirectShow graph using the Smart Tee

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H264/HEVC GPU encoding

• how to record the screen in 4K
• What BIOS setting is required to enable Intel QuickSync when a NVIDIA graphic card is installed?
• How to encode by using the Intel QuickSync GPU (QSV)

General

• video stops, or black window, when using 4K video sources or several cameras concurrently
• Windows Server pre-requisties
• Multiple instances fail to start and/or "Out of Memory" error
• the video window is not smooth
• Windows 10 N pre-requisties
• Is there an expiration date for the SDK I am buying?

DirectShow

• Building a DirectShow graph using the Smart Tee