Created by: mephi42
mov_read_trak()
and mov_read_trun()
generate a lot of AV_LOG_TRACE
logs, which are ultimately thrown away. However, log_callback()
still
formats and processes them. This causes av_log()
to - at least in some
cases I observed with perf record - to take 97% of
avformat_open_input()
run time. Improve this by returning from
log_callback()
early when a log is obviously not needed.