Make sure that we recover properly to playback on render failure. Also,Added a mechanism which allows custom validation checks on the inputs
check that the 'Multipass cache file' property is valid on x264encof a GstElementSettingsWidget. Also, a validation check for the
encoding. The invalidimultipass-cache-file property of this field caused a rene x264enc encoder failurewas added.
Depends on D1798