avdevice_register_all() is still required to register devices into lavf (this is required due to lavd being somewhat of a hack). Signed-off-by: Josh de Kock <josh@itanimul.li>
(cherry picked from commit e103cb3e9513949858ccf0ec44c5151239d397e9) Signed-off-by: Michael Niedermayer <michaelni@gmx.at>