[FFmpeg-devel] [PATCH] libavfilter/vaapi: enable vaapi rotation feature via call Intel iHD driver

[Timo Rothenpieler]

On 23.10.2018 10:55, Moritz Barsnick wrote:
> On Tue, Oct 23, 2018 at 15:52:40 +0800, Zachary Zhou wrote:
>> It supports clockwise rotation by 0/90/180/270 degrees defined in
>> va/va_vpp.h, tested following command line on SKL platform
> 
> Since these angles of rotation are called "transpose" in ffmpeg's other
> filters (transpose, transpose_npp), shouldn't that be the name chosen
> for this functionality?
> 
> It could then also use similar options.
> 
> Just wondering.

The transpose filters do not do plain rotation, they also flip the image 
at the same time. For reasons I'm not sure about that's more useful than 
plain rotation by multiples of 90°.
 From the looks of it, this filter does not do any flipping.

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