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Using a negative linesize to flip an image vertically is supported in ffmpeg but not for every function. This method treats frames that need and those that do not need alignment the same. An RGBA frame buffer with alignment that ffmpeg decides is optimal for the CPU and build options is allocated by ffmpeg. The `sws_scale` does the colorspace transformation into this RGBA frame buffer without flipping. Now the image is upside down and aligned. The combined unaligning and vertical flipping is then done by `av_image_copy_to_buffer` which seems to handle negative linesize correctly. Reviewed By: ISS Differential Revision: https://developer.blender.org/D13908
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.