var testCase = []struct {
	filename  string
	tolerance int64
}{
	{"../testdata/video-001.png", 1 << 12},
	{"../testdata/video-001.gif", 0},
	{"../testdata/video-001.interlaced.gif", 0},
}

func TestWriter(t *testing.T) {
	for _, tc := range testCase {
		m0, err := readImg(tc.filename)
		if err != nil {
			t.Error(tc.filename, err)
			continue
		}
		var buf bytes.Buffer
		err = Encode(&buf, m0, nil)