[FFmpeg-devel] AVFrame linesize and OpenGL GL_UNPACK_ROW_LENGTH
pkoshevoy at gmail.com
Tue May 7 06:40:35 CEST 2013
On 05/06/2013 10:24 PM, Reimar Döffinger wrote:
> On Mon, May 06, 2013 at 09:45:57PM -0600, Pavel Koshevoy wrote:
>> OpenGL requires that texture row stride must be pixel aligned,
>> because GL_UNPACK_ROW_LENGTH parameter is expressed in pixels, not
> You need to re-read the specs.
The spec says that row length is the number of pixels. It is really confusing
when 1984/3=661.3333 -- is not a "whole" number of pixels.
> That does specify the number of pixels indeed, but there is an alignment
> step afterwards, which is specified via GL_UNPACK_ALIGNMENT (and
> defaults to 32 bit alignment btw., so it really should have worked
> for your "magically" unless you changed it in the first place).
Yes, I've set GL_UNPACK_ALIGNMENT to 1, don't remember why anymore. I've just
removed my changes from image_get_linesize and commented out
GL_UNPACK_ALIGNMENT calls and it appears to be magically working.
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