[Ffmpeg-devel] Size from grab device

[Ramiro Polla]

Hello,

Michael Niedermayer wrote:
> Hi
>
> On Sat, Nov 11, 2006 at 11:18:28PM -0200, ramiro at lisha.ufsc.br wrote:
>   
>> Hello,
>>
>> I'm implementing VFW capture support for Windows, and I've come accross
>> two issues. Attached is the source code I'm currently using just so that
>> you can see how I'm setting the codec information.
>>
>> 1: The image is upside down, mirrorred, and colours swapped, the same way
>> as displaying in Windows.
>> I'm using PIX_FMT_BGR24 instead of PIX_FMT_RGB24 to swap the colours, but
>> I don't know how to invert the image.
>> It's easy if I want FFmpeg's output to be inverted. I just set
>> BITMAPINFOHEADER's size to negative for my output bmp. But how do I make
>> FFmpeg understand an inverted input?
>>     
>
> use negative linesize and have data[0] point to the "last" line
>   

It tried some with this information, but it seems this would have to be 
done to the Codec rather than the Format. I'm using CODEC_ID_RAWVIDEO.

Isn't there a way, without having to go too deep into the codec 
information from inside the format, to accomplish this?