[theora-dev] DirectShow Theora Issue with RGB24
cristian.adam at gmail.com
Thu Dec 11 00:47:06 PST 2008
Steve Scott wrote:
> I hope you can help, I am in need of some assistance with the
> DirectShow filters for Theora.
> I have successfully created a working capture graph using OGG / Vorbis
> / Theora, however, when I add a Sample Grabber Directshow filter
> between the FFDShow decoder and Theora Encoder, this results in
> the video file being mirrored vertically. I have noticed that the
> original CaptureGraph was using YUV12, but the SampleGrabber is
> configured to use RGB24. Is it likely that this is the cause of the
> Unfortuntatly I need to stick with RGB as I have already written a
> significant amount of code around this.
> Should I not be using RGB24 as an input to the OGG Mux filter?
> If not, can anyone suggest a good (free) Colour Space Convertor to
> convert from RGB24 -> YUV12 (The Microsoft only seems to convert
> between different RGB formats)
> Many thanks,
I've implemented a check to verify the bottom-up conforming with this page
I've tested it with RGB32, but somehow the RGB24 doesn't work correctly,
biHeight is positive so the image
should be bottom-up, but it's not! I was thinking of removing the RGB24
support because of this, its causing
My suggestion is to use RGB32.
In the future I will implement a function to specify if the image should
be flipped or not.
Hope this helps,
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