s->picture.key_frame = 1; s->picture.pict_type = FF_I_TYPE;
static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,                                 void *data){    DVVideoContext *s = c->priv_data;    s->sys = dv_codec_profile(c);    if (!s->sys)	return -1;    if(buf_size < s->sys->frame_size)        return -1;    c->pix_fmt = s->sys->pix_fmt;    s->picture = *((AVFrame *)data);    s->buf = buf;    c->execute(c, dv_encode_mt, (void**)&dv_anchor[0], NULL, 	       s->sys->difseg_size * 27);    emms_c();    return s->sys->frame_size;}