avfilter/allformats: make av_register_all thread safe
use ff_thread_once Suggested-by: wm4 <nfxjfg@googlemail.com> Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
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use ff_thread_once Suggested-by: wm4 <nfxjfg@googlemail.com> Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>