According to the MSDK documation[1], MFXCloneSession is a light-weight
equivalent of MFXJoinSession after MFXInit, so MFXJoinSession call isn't
needed in the msdk plugin, otherwise the cloned session is joined to the
parent session twice, and we will get a MFX error when closing the
parent session
example pipeline:
gst-launch-1.0 videotestsrc num-buffers=100 ! \
video/x-raw,format=NV12,width=352,height=288 ! msdkh264enc ! msdkh264dec ! \
msdkh264enc ! fakesink
Error message:
0:00:00.
211948518 21733 0x5586ee741c60 ERROR msdk
msdk.c:148:msdk_close_session: Close failed (undefined behavior)
[1]: https://software.intel.com/en-us/node/628429#MFXCloneSession
return NULL;
}
- status = MFXJoinSession (parent_priv->session, priv->session);
- if (status != MFX_ERR_NONE) {
- GST_ERROR ("Failed to join mfx session");
- g_object_unref (obj);
- return NULL;
- }
-
priv->is_joined = TRUE;
priv->hardware = parent_priv->hardware;
priv->job_type = parent_priv->job_type;