NodeBoy2

Using gdb to debug a long-running program (while streaming), in the _st_thread_create() function of the st library, the _st_active_count variable has reached 1695. At the same time, in the fetch_or_create()...

Refer to https://github.com/ossrs/srs/issues/713. In SrsSource::fetch(), add source->die_at = -1; At the same time, add the active_at variable to SrsSource to record the last active time (update it in on_metadata, on_video,...