How to access ICODEC property

Question

HI,

I am working on the camcorder application. I am trying to get set few parameters in encoder through ICODEC properties such as:

- Common Rate Control Mode

- Common and Max Bit Rate

- GOP Size

- Buffer Size

- Common Quality etc.

Can you help me how to do it for Metro Style app development under JavaScript?

Thanks,

Matic 

Answer 1

Hi,

I am working on the camcorder application. I am trying to get set few parameters in encoder through ICODEC properties such as:

- Common Rate Control Mode

- Common and Max Bit Rate

- GOP Size

- Buffer Size

- Common Quality etc.

Can you help me how to do it for Metro Style app development under JavaScript?

Thanks,

Matic

Answer 2

Hello,

The ICodecAPI object is not exposed in WinRT and is not accessable from Metro apps. You can use the "MediaEncodingProfile" class and more specifically the "VideoEncodingProperties" class to change the various properties of the WinRT video stream. Each codec has a specific set of properties. Since these may not be consistant between implimentations you can get a "MediaPropertySet" from the "VideoEncodingProperties" object and iterate through the property set to find the property that you want to modify.

I hope this helps,

James

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Windows Media SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/

Answer 3

With VideoEncodingProprties there are very few items that can be modified:

Property	Access type	Description
Bitrate	Read/write	Gets or sets the video bit rate.
FrameRate	Read-only	Gets or sets the video frame rate.
Height	Read/write	Gets or sets the video image height.
PixelAspectRatio	Read-only	Gets or sets the pixel aspect ratio.
Properties	Read-only	Gets additional format properties for the video stream.
Subtype	Read/write	Gets or sets the subtype of the format.
Type	Read-only	Gets or sets the format type.
Width	Read/write	Gets or sets the video image width.

From the list, captured from msdn, I do not see can set any other ICODEC property beside bitrate.

Is there any plan to enable access to all other ICODEC properties through WInRT?

Answer 4

Hello,

You are correct. It appears that VideoEncodingProprties.Properties is read only. Not what I expected. I sent a mail to our media architect to let him know that exposing these other properties would be very helpful. If he comes back with anything I can share I will certainly let you know. At this time I think that the reality is this is "by design".

-James

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Windows Media SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/

Answer 5

I appreciate your help as well as any firther feedback regarding this subject.

Answer 6

Hey,

I did hear back from our architect. He cofirmed that the current implientation is "by design". The team is aware of the limitaion but I'm not sure if they will be able to consider a design change.

I hope this helps,

James

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Windows Media SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/