packetizer/av1: fill the full extradata if it doesn't have the optional OBU

The optional part needed by the decoders.
This will restart the decoders if needed, but they should have received no frames yet
or the hardware decoder may be usable again or not (after a sequence header change).

modules/packetizer/av1.c

@@ -161,8 +161,9 @@ static void UpdateDecoderFormat(decoder_t *p_dec)
         p_dec->fmt_out.i_extra = 0;
     }
 
-    if(!p_dec->fmt_in->i_extra && !p_dec->fmt_out.i_extra)
+    if(p_dec->fmt_out.i_extra <= 4)
     {
+        free(p_dec->fmt_out.p_extra);
         p_dec->fmt_out.i_extra =
                 AV1_create_DecoderConfigurationRecord((uint8_t **)&p_dec->fmt_out.p_extra,
                                                       p_sys->p_sequence_header,