mp4mux hang with recovery file
Hello, I have found a problem in mp4mux which is easy to fix.
gst_qt_mux_prepare_moov_recovery contains GST_OBJECT_LOCK (qtmux); but it's called only from gst_qt_mux_start_file from part already locked with qtmux. This double-lock causes hang, at least on Windows. Removing the locking from gst_qt_mux_prepare_moov_recovery should solve the problem.