* commit '7e2561fa8313982aa21f7657953eedeeb33b210d':
lavfi: Use ff_get_video_buffer in all filters using hwframes
vf_hwupload_cuda: Fix build error
Merged-by: Matthieu Bouron <matthieu.bouron@gmail.com>
Add missing return value checks to suppress build warning and
remove noop ff_formats_unref() calling.
Note: most filters using ff_formats_ref() didn't have a suitable
error handling, it's a potential memory leak issue.
Signed-off-by: Jun Zhao <jun.zhao@intel.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>
Also adds a new flag to mark filters which are aware of hwframes and
will perform this task themselves, and marks all appropriate filters
with this flag.
This is required to allow software-mapped hardware frames to work,
because we need to have the frames context available for any later
mapping operation in the filter graph.
The output from the filter graph should only propagate further to an
encoder if the hardware format actually matches the visible format
(mapped frames are valid here and have an hw_frames_ctx, but this
should not be given to the encoder as its hardware context).
