libvmaf crashes for input video dimensions < 32 pixels on a side #1035

$ ffmpeg -f lavfi -i testsrc -t 1 -pix_fmt yuv420p -vf scale=16x16 test_16x16.y4m
$ libvmaf/build/tools/vmaf -r test_16x16.y4m -d test_16x16.y4m 
VMAF version dfe183cd
1 frame  ⢀⠀ 0.00 FPSSegmentation fault (core dumped)

#0  0x0000000000426e29 in dwt2_src_indices_filt (src_ind_y=0x61d938, src_ind_x=0x61d958, w=2, h=2) at ../src/feature/integer_adm.c:587
        ind0 = 152559
        ind1 = 152560
        ind2 = 152561
        ind3 = 152562
        h_half = 1
        w_half = 1
        i = 76280
        j = 1
#1  0x00000000004365f6 in integer_compute_adm (s=0x61d900, ref_pic=0x7fffffff8f00, dis_pic=0x7fffffff8f60, score=0x7fffffff8e08, 
    score_num=0x7fffffff8e00, score_den=0x7fffffff8df8, scores=0x7fffffff8db0, buf=0x61d908, adm_enhn_gain_limit=100, adm_norm_view_dist=3, 
    adm_ref_display_height=1080) at ../src/feature/integer_adm.c:2453
        num_scale = 0
        den_scale = 0
        scale = 3
        w = 2
        h = 2
        numden_limit = 1.2345679012345679e-14
        curr_ref_stride = 8
        curr_dis_stride = 8
        buf_stride = 8
        i4_curr_ref_scale = 0x61f120
        i4_curr_dis_scale = 0x61f520
        num = 28.096094608306885
        den = 40.501220226287842
#2  0x0000000000437328 in extract (fex=0x61c6f0, ref_pic=0x7fffffff8f00, ref_pic_90=0x0, dist_pic=0x7fffffff8f60, dist_pic_90=0x0, index=0, 
    feature_collector=0x613730) at ../src/feature/integer_adm.c:2665
        s = 0x61d900
        err = 0
        score = 3.3951932663349407e-313
        score_num = 1.3580773064154005e-312
        score_den = 2.1477596859555246e-317
        scores = {4.452723503112793, 13.645867347717285, 18.86121940612793, 18.861213684082031, 4.7821516990661621, 7.9941391944885254, 
          3.182993686497315e-313, 3.1682176928454105e-317}
#3  0x0000000000425606 in vmaf_feature_extractor_context_extract (fex_ctx=0x61c7b0, ref=0x7fffffff8f00, ref_90=0x0, dist=0x7fffffff8f60, 
    dist_90=0x0, pic_index=0, vfc=0x613730) at ../src/feature/feature_extractor.c:185
        err = -28832
#4  0x000000000040be69 in vmaf_read_pictures (vmaf=0x6136d0, ref=0x7fffffff8f00, dist=0x7fffffff8f60, index=0) at ../src/libvmaf.c:358
        fex_ctx = 0x61c7b0
        i = 0
        err = 0
#5  0x0000000000404ca0 in main (argc=5, argv=0x7fffffffdb58) at ../tools/vmaf.c:348
        pic_ref = {pix_fmt = VMAF_PIX_FMT_YUV420P, bpc = 8, w = {16, 8, 8}, h = {16, 8, 8}, stride = {32, 32, 32}, data = {0x61de60, 0x61e060, 
            0x61e160}, ref = 0x61dcf0}
        pic_dist = {pix_fmt = VMAF_PIX_FMT_YUV420P, bpc = 8, w = {16, 8, 8}, h = {16, 8, 8}, stride = {32, 32, 32}, data = {0x61e2c0, 0x61e4c0, 
            0x61e5c0}, ref = 0x61de10}
        ret1 = 0
        ret2 = 0
        err = 0
        istty = 1
        c = {path_ref = 0x7fffffffdf56 "test_16x16.y4m", path_dist = 0x7fffffffdf68 "test_16x16.y4m", frame_cnt = 0, width = 0, height = 0, 
          pix_fmt = VMAF_PIX_FMT_UNKNOWN, bitdepth = 0, use_yuv = false, output_path = 0x0, output_fmt = VMAF_OUTPUT_FORMAT_XML, model_config = {{
              path = 0x0, version = 0x484fcd "vmaf_v0.6.1", cfg = {name = 0x0, flags = 0}, feature_overload = {{name = 0x0, 
                  opts_dict = 0x0} <repeats 32 times>}, overload_cnt = 0, buf = 0x0}, {path = 0x0, version = 0x0, cfg = {name = 0x0, flags = 0}, 
              feature_overload = {{name = 0x0, opts_dict = 0x0} <repeats 32 times>}, overload_cnt = 0, buf = 0x0} <repeats 31 times>}, 
          model_cnt = 1, feature_cfg = {{name = 0x0, opts_dict = 0x0, buf = 0x0} <repeats 32 times>}, feature_cnt = 0, 
          log_level = VMAF_LOG_LEVEL_NONE, subsample = 0, thread_cnt = 0, no_prediction = false, quiet = false, cpumask = 0}
        file_ref = 0x610eb0
        file_dist = 0x611090
        vid_ref = {vtbl = 0x485b00 <Y4M_INPUT_VTBL>, ctx = 0x611270, fin = 0x610eb0}
        vid_dist = {vtbl = 0x485b00 <Y4M_INPUT_VTBL>, ctx = 0x6124a0, fin = 0x611090}
        cfg = {log_level = VMAF_LOG_LEVEL_INFO, n_threads = 0, n_subsample = 0, cpumask = 0}
        vmaf = 0x6136d0
        model = 0x6138c0
        model_sz = 8
        model_collection = 0x6138e0
        model_collection_sz = 8
        model_collection_label = {0x0}
        model_collection_cnt = 0
        fps = 0
        t0 = 6645
        picture_index = 0