Closed coldnight closed 5 years ago
coldnight
commented
5 years ago The CI has failed, and I figure out that if we migrate libwebp's version to 0.5.0 the test would failed with
--- FAIL: TestEncode (0.48s)
writer_test.go:86: 4: average delta too high; got 12, want <= 0
FAILI got some information after tested via git bisect
b4e731cd93f9e86e9ea8cde7a0c0aa54ca0d777d is the first bad commit
commit b4e731cd93f9e86e9ea8cde7a0c0aa54ca0d777d
Author: skal <pascal.massimino@gmail.com>
Date: Mon Oct 5 11:26:52 2015 +0200
neon-implementation for rescaler code
It's better to stay with a 32b fixed-point precision overall, otherwise
the C-version on ARM gets *slower*.
Actually, gcc ARM compiler optimizes some instructions pretty
well when WEBP_RESCALER_FIX is exactly 32, even in C.
Change-Id: I0eea97f7db5947470f5af355dee098eca81e178d
:100644 100644 ee4033d187de80e883f9581f95a0087099967fce 6d60f36afade38df2dcec835324c7baceed878e9 M Android.mk
:100644 100644 e57f8143cf61599dc1860c72c7f7eafe636f0d69 b0e02f170454b0e8879486fef15a355e22cc2599 M Makefile.vc
:100644 100644 c90c07491747fb8b65a0a6d43c94fc6c8ad9a9c3 1f62d659538c718ebfc245974f095df01bb740e7 M makefile.unix
:040000 040000 6f03777cb64b4fce6823059ffdac1c1e589e6724 4b551b0f679c46961cce586648173116b1a18344 M srcSee also: https://github.com/webmproject/libwebp/commit/b4e731cd93f9e86e9ea8cde7a0c0aa54ca0d777d
coldnight
commented
5 years ago I got something really weird. At this point
See also: https://github.com/webmproject/libwebp/commit/b4e731cd93f9e86e9ea8cde7a0c0aa54ca0d777d
It works If I removed src/dsp/rescaler_neon.c(but it does not work if made the file empty)
coldnight
commented
5 years ago After this commit 8a13762a616e330d77e569b83f38fa09b3eb0f62 all the tests has been passed, but I don't know why. And also the image are not really "lossless". The two pictures between raw image and webp image are different from the naked eye.
The code snippet:
package main
import (
"bytes"
"image"
_ "image/png"
"io"
"log"
"os"
"github.com/coldnight/webp"
)
const testdataDir = "./webp/testdata/"
func main() {
img0, err := loadImage("4_webp_ll.png")
if err != nil {
log.Fatal(err)
}
buf := new(bytes.Buffer)
opt := &webp.Options{
Lossless: true,
Quality: 90,
}
err = webp.Encode(buf, img0, opt)
if err != nil {
log.Fatal(err)
}
img1, err := webp.Decode(buf)
if err != nil {
log.Fatal(err)
}
buf1 := new(bytes.Buffer)
err = webp.Encode(buf1, img0, opt)
if err != nil {
log.Fatal(err)
}
f, err := os.OpenFile("failed.webp", os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
log.Fatal(err)
}
io.Copy(f, buf1)
if got := averageDelta(img0, img1); got > 0 {
log.Fatalf("average delta too high; got %d, want <= 0", got)
}
}
func loadImage(filename string) (m image.Image, err error) {
f, err := os.Open(testdataDir + filename)
if err != nil {
return
}
defer f.Close()
m, _, err = image.Decode(f)
return
}
// averageDelta returns the average delta in RGB space. The two images must
// have the same bounds.
func averageDelta(m0, m1 image.Image) int {
b := m0.Bounds()
var sum, n int64
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
c0 := m0.At(x, y)
c1 := m1.At(x, y)
r0, g0, b0, a0 := c0.RGBA()
r1, g1, b1, a1 := c1.RGBA()
sum += delta(r0, r1)
sum += delta(g0, g1)
sum += delta(b0, b1)
sum += delta(a0, a1)
n += 4
}
}
return int((sum / n) >> 8)
}
func delta(u0, u1 uint32) int64 {
d := int64(u0) - int64(u1)
if d < 0 {
return -d
}
return d
}Maybe it related to https://github.com/webmproject/libwebp/releases/tag/v0.5.0
WebPConfig::exact (-exact in cwebp; -alpha_cleanup is now the default)
coldnight
commented
5 years ago
We are using this library to convert images into WebP format, thanks for your awesome job. Here is our options:
After all images has converted, we found some images's compress rate is higher than 100. Then we try to use
cwebp-1.0.2to convert those images, and almost images's compress rate is lower than 100.So I made this PR to upgrade libwebp's version to 1.0.2, and I also made some tests:
Compress Rate Report Between 1.0.2 and 0.5.0(`+` made by 1.0.2 and `-` made by `0.5.0`
```diff - images/10.jpeg - raw_size: 268675 - webp_size: 294154 - compress_rate: 109.48 + images/10.jpeg - raw_size: 268675 - webp_size: 260364 - compress_rate: 96.91 - images/100.jpeg - raw_size: 150187 - webp_size: 150786 - compress_rate: 100.40 + images/100.jpeg - raw_size: 150187 - webp_size: 109580 - compress_rate: 72.96 - images/101.jpeg - raw_size: 147819 - webp_size: 147982 - compress_rate: 100.11 + images/101.jpeg - raw_size: 147819 - webp_size: 117970 - compress_rate: 79.81 - images/102.jpeg - raw_size: 142298 - webp_size: 146328 - compress_rate: 102.83 + images/102.jpeg - raw_size: 142298 - webp_size: 104992 - compress_rate: 73.78 - images/103.jpeg - raw_size: 140774 - webp_size: 141184 - compress_rate: 100.29 + images/103.jpeg - raw_size: 140774 - webp_size: 110424 - compress_rate: 78.44 - images/104.jpeg - raw_size: 138640 - webp_size: 147868 - compress_rate: 106.66 + images/104.jpeg - raw_size: 138640 - webp_size: 113796 - compress_rate: 82.08 - images/105.jpg - raw_size: 137696 - webp_size: 145858 - compress_rate: 105.93 + images/105.jpg - raw_size: 137696 - webp_size: 78132 - compress_rate: 56.74 - images/106.jpeg - raw_size: 137832 - webp_size: 141070 - compress_rate: 102.35 + images/106.jpeg - raw_size: 137832 - webp_size: 100304 - compress_rate: 72.77 - images/107.jpg - raw_size: 135415 - webp_size: 170110 - compress_rate: 125.62 + images/107.jpg - raw_size: 135415 - webp_size: 107752 - compress_rate: 79.57 - images/108.jpeg - raw_size: 134618 - webp_size: 140256 - compress_rate: 104.19 + images/108.jpeg - raw_size: 134618 - webp_size: 110316 - compress_rate: 81.95 - images/109.jpeg - raw_size: 132110 - webp_size: 144796 - compress_rate: 109.60 + images/109.jpeg - raw_size: 132110 - webp_size: 86544 - compress_rate: 65.51 - images/11.jpeg - raw_size: 266425 - webp_size: 296350 - compress_rate: 111.23 + images/11.jpeg - raw_size: 266425 - webp_size: 233448 - compress_rate: 87.62 - images/110.jpeg - raw_size: 132710 - webp_size: 134124 - compress_rate: 101.07 + images/110.jpeg - 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compress_rate: 112.56 + images/91.jpeg - raw_size: 184742 - webp_size: 142618 - compress_rate: 77.20 - images/92.jpeg - raw_size: 183611 - webp_size: 186604 - compress_rate: 101.63 + images/92.jpeg - raw_size: 183611 - webp_size: 149606 - compress_rate: 81.48 - images/93.jpeg - raw_size: 172830 - webp_size: 175424 - compress_rate: 101.50 + images/93.jpeg - raw_size: 172830 - webp_size: 127234 - compress_rate: 73.62 - images/94.jpeg - raw_size: 171496 - webp_size: 189784 - compress_rate: 110.66 + images/94.jpeg - raw_size: 171496 - webp_size: 145270 - compress_rate: 84.71 - images/95.jpeg - raw_size: 171554 - webp_size: 176094 - compress_rate: 102.65 + images/95.jpeg - raw_size: 171554 - webp_size: 127382 - compress_rate: 74.25 - images/96.jpeg - raw_size: 168665 - webp_size: 169518 - compress_rate: 100.51 + images/96.jpeg - raw_size: 168665 - webp_size: 124184 - compress_rate: 73.63 - images/97.jpg - raw_size: 162928 - webp_size: 163242 - compress_rate: 100.19 + images/97.jpg - raw_size: 162928 - webp_size: 92658 - compress_rate: 56.87 - images/98.jpg - raw_size: 162068 - webp_size: 162920 - compress_rate: 100.53 + images/98.jpg - raw_size: 162068 - webp_size: 91270 - compress_rate: 56.32 - images/99.jpeg - raw_size: 161352 - webp_size: 162626 - compress_rate: 100.79 + images/99.jpeg - raw_size: 161352 - webp_size: 118972 - compress_rate: 73.73 ```Here is the test code
main.go
```go package main import ( "bytes" "fmt" "image" _ "image/png" _ "image/jpeg" "log" "os" "path/filepath" "gopkg.in/chai2010/webp.v1" // "github.com/coldnight/webp" ) func main() { files, err := filepath.Glob("images/*") if err != nil { log.Fatal(err) } for _, fn := range files { img0, size := loadImage(fn) webpSize := encodeWebP(img0) rate := float64(webpSize) / float64(size) fmt.Printf("%s - raw_size: %d - webp_size: %d - compress_rate: %.2f\n", fn, size, webpSize, rate * 100) } } func loadImage(path string) (image.Image, int64) { f, err := os.Open(path) if err != nil { log.Fatal(err) } defer f.Close() m, _, err := image.Decode(f) if err != nil { log.Fatal(err) } stat, err := f.Stat() if err != nil { log.Fatal(err) } return m, stat.Size() } func encodeWebP(img image.Image) int { options := &webp.Options{ Lossless: false, Quality: 70, } buf := new(bytes.Buffer) err := webp.Encode(buf, img, options) if err != nil { log.Fatal(err) } return buf.Len() } ```