avpicture_fill(&info->pict, s->ptr, info->pix_fmt, info->width, info->height);
avpicture_fill(&info->pict, s->ptr, info->pix_fmt, (info->width+15)&(~15), (info->height+15)&(~15));
static int read_packet_alloc_cb(void *opaque, AVImageInfo *info){    VideoData *s = opaque;    if (info->width != s->width ||        info->height != s->height)        return -1;    avpicture_fill(&info->pict, s->ptr, info->pix_fmt, info->width, info->height);    return 0;}