B4J Question WebP images and B4J, is it possible to convert jpg to webp ?

Magma

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Hi there...

last days i was testing webp images and i have to say they are very good !

B4J has a library here... that can help load them as a simple image...

But is it possible to convert bytes or image of jpeg for example ---> to bytes of webp and how (with source code at b4j) ?

ps: Some will tell - why you didn't just change the quality of jpeg...
image.WriteToStream(out, quality, "JPEG")
but what i want is something like this:
image.WriteToStream(out, quality, "WEBP")
but there is not an option for webp :-(
 
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MarcoRome

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Look this:

Need to include META-INF in additional jar

I am trying to use webp-imageio-core. The jar has native libraries stored in META-INF. It works when I run it in debug mode but not okay in release mode since the jar does not include the libraries and I have to manually add these libraries to the compiled jar.
www.b4x.com
 
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Magma

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actually getting this when i try to convert a jpg file to webp:

 
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Magma

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Magma

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Magma

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If someone get into this thread will read my monologue

Searching all over ther internet..

Found this: https://github.com/zakgof/webp4j and hey... remember that Erel wrapped this library...

scrolling down the page and i ve seen what i ve been looking...

B4X: 
// Encode
BufferedImage bi = ...
float quality = 80f;
byte[] bytes = Webp4j.encode(bi, quality);

// Decode
BufferedImage restored = Webp4j.decode(bytes);

but hey in B4J Library WebP... there is only Load from file... not encode/decode :-( . ... is there a way with JavaObject or inline java someway ?
 
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moster67

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Never tried it but you can probably use ffmpeg (calling it from jShell) using a command like this:
B4X: 
ffmpeg -i file.webp out.png
or
ffmpeg -i file.webp out.jpg
 
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Magma

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Need the reverse

image.WriteToStream(out, quality, "WEBP")

Will be better to have them in bytes without messing files... And without the need of ffmpeg

I will check the webp B4xlib and try to extend it with encode as Erel said to me .. hope i ll have time on weekend
 
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Quandalle

Member
Licensed User
Here is an example of conversion using cwebp.exe the webp image compressor developed by Google

B4X: 
Public Sub jpeg2webp(dir As String ,fn As String)
    Dim shl As Shell
    ' call convert doing resize 
    Dim fullpath As String = File.Combine(dir,fn)
    shl.Initialize("shl", File.DirApp &"\cwebp.exe", Array As String("-resize","0","750",fullpath, "-o",fullpath.SubString2(0,fullpath.Length-4) & "webp"))
    shl.WorkingDirectory = File.dirapp
    shl.Run(-1)
    wait for shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    If Not(Success) Then
        Log(StdErr )
    End If
End Sub
 
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