s->pict_type, s->dropable);*/
if(s->codec_id != CODEC_ID_H264){
- if((s->last_picture_ptr==NULL || s->last_picture_ptr->data[0]==NULL) && s->pict_type!=AV_PICTURE_TYPE_I){
- av_log(avctx, AV_LOG_ERROR, "warning: first frame is no keyframe\n");
+ if((s->last_picture_ptr==NULL || s->last_picture_ptr->data[0]==NULL) &&
+ (s->pict_type!=AV_PICTURE_TYPE_I || s->picture_structure != PICT_FRAME)){
+ if (s->pict_type != AV_PICTURE_TYPE_I)
+ av_log(avctx, AV_LOG_ERROR, "warning: first frame is no keyframe\n");
+ else if (s->picture_structure != PICT_FRAME)
+ av_log(avctx, AV_LOG_INFO, "allocate dummy last picture for field based first keyframe\n");
+
/* Allocate a dummy frame */
i= ff_find_unused_picture(s, 0);
s->last_picture_ptr= &s->picture[i];