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Watermarking + Directshow filter


Watermarking + Directshow filter

By : user3862328
Date : November 22 2020, 07:01 PM
may help you . I want to put a watermark on my video. IS it possible to do with directshow filter. Want to overlap an image on video like channel logo. so that image will be fixed when video is playing. , I've done this before. You have two options.
code :


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Do I need a unique class ID for each DirectShow filter instance if a filter has persistent local data?

Do I need a unique class ID for each DirectShow filter instance if a filter has persistent local data?


By : user3715612
Date : March 29 2020, 07:55 AM
this will help Class identifier is specific to a class, not to class instance. Your filter class should have its own unique identifier, and all instances of the class would share it on runtime. If you are copying code from another project, you need to make sure you replace all existing CLSID, IID, LIBID identifiers with newly generated ones.
How to to make sure the Sample Grabber filter won't generate any more callbacks when shutting down my DirectShow filter

How to to make sure the Sample Grabber filter won't generate any more callbacks when shutting down my DirectShow filter


By : user3831371
Date : March 29 2020, 07:55 AM
this one helps. What about issuing ISampleGrabber::SetCallback(NULL, ... prior to stopping/releasing the filter graph?
More to this, you can set an internal flag indicating termination and check it in the callbacks you have to immeditely return without further processing.
Is there any way of discovering which DirectShow filter in a graph sent a DirectShow event?

Is there any way of discovering which DirectShow filter in a graph sent a DirectShow event?


By : Ahmed A
Date : March 29 2020, 07:55 AM
hope this fix your issue No, with EC_ERRORABORT event code you just have HRESULT value to possibly help you.
UPD. With certain luck DirectShow Spy can shed some more light.
DirectShow transform filter - how to get source filter IBaseFilter that connected to my filter input pin?

DirectShow transform filter - how to get source filter IBaseFilter that connected to my filter input pin?


By : user2259327
Date : March 29 2020, 07:55 AM
hope this fix your issue I've found a correct way.
In CheckConnect method you can return E_FAIL to deny connection.
how to develop LeGall 5/3 filter for reversible watermarking?

how to develop LeGall 5/3 filter for reversible watermarking?


By : Smile
Date : March 29 2020, 07:55 AM
I hope this helps you . The LeGall 5/3 wavelet (CDF 5/3) is named as bior2.2 in MATLAB. The dwt2 command with 'bior2.2' argument performs the two-dimensional CDF 5/3 wavelet decomposition:
code :
[LL,HL,LH,HH] = dwt2(x,'bior2.2');
ls = liftwave('cdf2.2');
[LL,HL,LH,HH] = lwt2(x,ls);
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