Created attachment 156005 [details]
Parse application sample to reproduce error changing state through play-null-play

Hi,

Changing state (play-null-play) crashes on pipelines created by gst_parse_launch. This occurs specifically on pipelines that need dynamic pads to work.The pipeline works only once.

When discussed on IRC, was told me that gst_parse_launch() does a lot of 'magic' things under the hood which are hard to reset properly, so a work around would be to throw away the pipeline and create a new one.

However, it is still a limitation, that it should be fixed at some point.

The attachment is a C application which receives the pipeline description as a parameter, it creates a pipeline using the gst_parse_launch() and initializes a timer, which waits 6 seconds to change the pipeline state from null to play and backwards.

It could be helpful if you want to reproduce the error.

To run 'gst-parse-app':
     ./gst-parse-app "<pipeline-description>"
Ex:
     ./gst-parse-app "filesrc name = src location = some.m4a ! qtdemux
      ! decodebin ! audioconvert  ! alsasink"