There is a Null Pointer Dereference in function filter_core/filter_pck.c:gf_filter_pck_new_alloc_internal in GPAC 1.0.1. The pid comes from function av1dmx_parse_flush_sample, the ctx.opid maybe NULL. The result is a crash in gf_filter_pck_new_alloc_internal.
https://github.com/gpac/gpac/issues/1719
https://github.com/gpac/gpac/commit/13dad7d5ef74ca2e6fe4010f5b03eb12e9bbe0ec