Re: Cannot read input picture file

[Pascal Massimino]

Hi,

On Tue, Oct 9, 2012 at 12:02 PM, <elbue...@gmail.com> wrote:

I tried using cwebp.exe to convert pngs, but it's giving me the following error:

C:\projects\png>cwebp.exe renderBotWeb.png -q 40 -v -o renderBotWeb.webp
IWICFormatConverter_Initialize(pConverter, (IWICBitmapSource*)pFrame, has_alpha
? MAKE_REFGUID(GUID_WICPixelFormat32bppRGBA_) : MAKE_REFGUID(GUID_WICPixelFormat
24bppRGB_), WICBitmapDitherTypeNone, NULL, 0.0, WICBitmapPaletteTypeCustom) fail
ed 88982f50
Error! Could not process file renderBotWeb.png
Error! Cannot read input picture file 'renderBotWeb.png'

What am I doing wrong?

Is the PNG image viewable using other programs? (Like, in a browser).

Also: it looks like a problem with system-libraries. Some version numbers would help i guess...

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[James Zern]

On Saturday, October 13, 2012 6:00:04 AM UTC-7, elbue...@gmail.com wrote:

> Is the PNG image viewable using other programs? (Like, in a browser).

Yes, of coarse

Also: it looks like a problem with system-libraries. Some version numbers would help i guess...

It's the latest version 0.2
 

Are you on XP, Vista, Windows 7?

You might try adding -noalpha, it may be related to a recently closed issue [1], though the source there was jpeg.

[1] http://code.google.com/p/webp/issues/detail?id=127

[James Zern]

On Tuesday, October 16, 2012 9:04:45 AM UTC-7, elbue...@gmail.com wrote:

In using Windows XP SP3.
Yes, I need alpha transparancy for this image. The main reason I'm using webp is because it supports lossy with alpha transparancy (doesn't it?)

It does. The problem likely has to do with XP and the Windows Image Component (WIC) which is used to decode the image. If they are out of date then the request for RGBA or BGRA will fail. If you can build from source you could temporarily use libpng instead.

[James Zern]

On Tuesday, October 16, 2012 11:07:32 AM UTC-7, James Zern wrote:

On Tuesday, October 16, 2012 9:04:45 AM UTC-7, elbue...@gmail.com wrote:

In using Windows XP SP3.
Yes, I need alpha transparancy for this image. The main reason I'm using webp is because it supports lossy with alpha transparancy (doesn't it?)

It does. The problem likely has to do with XP and the Windows Image Component (WIC) which is used to decode the image.

I opened issue 130 to track this [1]. In testing it looks like the BGRA -> RGBA conversion fails on XP SP3. I haven't checked to see whether this is avoidable with certain configurations, but the solution will be to make the convert a bit more robust -- BGRA seems to work in this case.

[1] http://code.google.com/p/webp/issues/detail?id=130