How to split a mkv(AVC+AAC) file to pure video and audio files by using gst-launch?

[Raymond18]

To TIm,

According to your describing, The following command should create a file
with H.264 data that can be read without a container. But something wrong
after executing.
Do I use a wrong pipeline?

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$ gst-launch-0.10 filesrc location=/home/test.mkv  ! matroskademux !
h264parse ! 'video/x-h264,stream-format=byte-stream' ! filesink
location=from_matro.h264 
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstMatroskaDemux:matroskademux0:
GStreamer encountered a general stream error.
Additional debug info:
matroska-demux.c(6090): gst_matroska_demux_loop ():
/GstPipeline:pipeline0/GstMatroskaDemux:matroskademux0:
stream stopped, reason not-negotiated
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
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