Can not play MKV

[Mikl]

Hello,

I have MKV, recodred my gstreamer
  video: appsrc ! 'video/x-raw-rgb,width=800,height=600,framerate=24/1' !
jpegenc ! matroskamux ! filesink 
  2 subtitles truks: appsrc ! '"text/x-raw' ! matroskamux ! filesink 

when i am trying to play it
gst-launch-1.0 filesrc location=C:\\test\\test.mkv ! matroskademux name=mux
mux.video_0! jpegdec ! autovideosink

i have this error

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstMatroskaDemux:mux: Internal
data stream error.
Additional debug info:
matroska-demux.c(4759): gst_matroska_demux_loop ():
/GstPipeline:pipeline0/GstMatroskaDemux:mux:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

What is wrong?
Can you help me please to play it

Thank you in advance.




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