viewing frame-by-frame (NextFrame and PreviousFrame) of a mp4 vídeo with VB.NET (2022) and LEAD MM

#1 Posted : Monday, May 16, 2022 4:02:23 AM(UTC)

aroig

Groups: Registered
Posts: 10

We need to navigate frame-by-frame of mp4 vídeos (back and forward) with VB.NET and LEAD MM v20
Thank you

#2 Posted : Monday, May 16, 2022 12:05:21 PM(UTC)

Christopher

Groups: Registered, Tech Support, Administrators
Posts: 89

Was thanked: 4 time(s) in 4 post(s)

To navigate the LEADTOOLS frames from your MP4 files, you can use the PlayCtrl's - NextFrame and PreviousFrame methods.

The LEAD Online Documentation for each of these methods has an example snippet of how to set this programmatically in VB.NET.

Code:

         If _playctrl.State = PlayState.Running Then 
            _playctrl.Pause() 
         End If 
 
         _playctrl.NextFrame() 

         If _playctrl.State = PlayState.Running Then 
            _playctrl.Pause() 
         End If 
 
         _playctrl.PreviousFrame()

Additionally, an example of this being implemented can be found in the LEAD Multimedia Player demo included with the LEADTOOLS v20 installation file folder as well.

precompiled demo
C:\LEADTOOLS 20\Shortcuts\Multimedia\Playback\DirectShow\Dotnet Class Library\Multimedia Player 64-bit.lnk

project source files
C:\LEADTOOLS 20\Examples\Multimedia\ltmm\Dotnet\VB\Player

MainFrm.vb line 2954

To test this in the demo itself please do the following:

>> Run the LEAD Player demo
>> File >> Open Media File...
>> Navigate to the example MP4 file included with the LEADTOOLS v20 installation here:
C:\LEADTOOLS 20\Media\DaDa_H264.mp4
>> While the video is playing select pause [ || ]
>> While paused choose to either go forward or backward by frames with these buttons

Chris Thompson
Developer Support Engineer
LEAD Technologies, Inc.


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viewing frame-by-frame (NextFrame and PreviousFrame) of a mp4 vídeo with VB.NET (2022) and LEAD MM