moov-recovery-file addition in gstreamer to support recovery of recording on crash

[Prasad H L Bhat]

In gstreamer.py, if moov-recovery-file option is added then it will be possible to recover if Kazam were to crash during recording. The recovery file can be used to recover the .movie.mux file to get a .movie file, using gst-launch-1.0. For instance, the following command can be used to recover when the temporary name is kazam_ky212csv.movie.

gst-launch-1.0 qtmoovrecover broken-input=kazam_ky212csv.movie.mux recovery-input=kazam_ky212csv.movie.recovery faststart-mode=true fixed-output=out-kazam.movie

Recovery of saved recording is quite critical in most situations. It may also help, if later the above command invocation can be done via a menu option in Kazam, although that would be feature request. Recovery however I consider it to be bug.