Can not start playing video

[Mikl]

Hello,

I can not start (or don`t see) video playback from mkv file.

It contain:

-1 video stream coded by jpegenc

-2 subtitles streams 

For the moment i am trying to have only video.

But after gst_element_set_state(_pipeline, GST_STATE_PLAYING); nothing is happening.

Also i don`t see ant activity of reading my file (using ProcessMonitor).

My questions is what i am doing wrong:

-is video playing, but i don`t see it?

-if not how to start it?

My pipeline is 

filesrc locatrion="path" ! matroskademux ! jpegdec ! autovideosink

autovideosink is used as test. It will be appsrclater.

But i am doing this line by line in my c++ code.

Extraction from source code in attachment.

Thank you for help in advance

Best regards, Michael.

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