* modules/codec/ffmpeg/*: fix interlaced encoding (top field first + repeat field.)

modules/codec/ffmpeg/encoder.c

@@ -608,11 +608,11 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
     /* Let ffmpeg select the frame type */
     frame.pict_type = 0;
 
-    frame.repeat_pict = p_pict->i_nb_fields;
+    frame.repeat_pict = 2 - p_pict->i_nb_fields;
 
 #if LIBAVCODEC_BUILD >= 4685
     frame.interlaced_frame = !p_pict->b_progressive;
-    frame.top_field_first = p_pict->b_top_field_first;
+    frame.top_field_first = !!p_pict->b_top_field_first;
 #endif
 
 #if LIBAVCODEC_BUILD < 4702

modules/codec/ffmpeg/video.c

@@ -646,7 +646,7 @@ picture_t *E_(DecodeVideo)( decoder_t *p_dec, block_t **pp_block )
                 p_pic->b_force = VLC_TRUE;
             }
 
-            p_pic->i_nb_fields = p_sys->p_ff_pic->repeat_pict;
+            p_pic->i_nb_fields = 2 + p_sys->p_ff_pic->repeat_pict;
 #if LIBAVCODEC_BUILD >= 4685
             p_pic->b_progressive = !p_sys->p_ff_pic->interlaced_frame;
             p_pic->b_top_field_first = p_sys->p_ff_pic->top_field_first;