fprintf(stderr, "Bad picture start code\n");
av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
int flv_h263_decode_picture_header(MpegEncContext *s){    int format, width, height;    /* picture header */    if (get_bits_long(&s->gb, 17) != 1) {        fprintf(stderr, "Bad picture start code\n");        return -1;    }    format = get_bits(&s->gb, 5);    if (format != 0 && format != 1) {        fprintf(stderr, "Bad picture format\n");        return -1;    }    s->h263_flv = format+1;    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */    format = get_bits(&s->gb, 3);    switch (format) {    case 0:        width = get_bits(&s->gb, 8);        height = get_bits(&s->gb, 8);        break;    case 1:        width = get_bits(&s->gb, 16);        height = get_bits(&s->gb, 16);        break;    case 2:        width = 352;        height = 288;        break;    case 3:        width = 176;        height = 144;        break;    case 4:        width = 128;        height = 96;        break;    case 5:        width = 320;        height = 240;        break;    case 6:        width = 160;        height = 120;        break;    default:        width = height = 0;        break;    }    if ((width == 0) || (height == 0))        return -1;    s->width = width;    s->height = height;    s->pict_type = I_TYPE + get_bits(&s->gb, 2);    if (s->pict_type > P_TYPE)        s->pict_type = P_TYPE;    skip_bits1(&s->gb);	/* deblocking flag */    s->qscale = get_bits(&s->gb, 5);    s->h263_plus = 0;    s->unrestricted_mv = 1;    s->h263_long_vectors = 0;    /* PEI */    while (get_bits1(&s->gb) != 0) {        skip_bits(&s->gb, 8);    }    s->f_code = 1;    if(s->avctx->debug & FF_DEBUG_PICT_INFO){        printf("%c esc_type:%d, qp:%d num:%d\n",               av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);    }        s->y_dc_scale_table=    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;    return 0;}