catch_up_live_stream() has been removed for having duplicated code from
restart_source_bin(). This method had been added because, right after
exiting the context process_all_frames(), restart_source_bin() detected
many underruns and, therefore, raised the next error:

"Video loss. Too many underruns."

In order to avoid this, process_all_frames() now deactivates the
underrun_timeout during the process.