Filter pre-initialization function
This callback will be called immediately after the filter context is allocated, to allow allocating and initing sub-objects.
If this callback is not NULL, the uninit callback will be called on allocation failure.
@return 0 on success, AVERROR code on failure (but the code will be dropped and treated as ENOMEM by the calling code)
See Implementation
Filter pre-initialization function
This callback will be called immediately after the filter context is allocated, to allow allocating and initing sub-objects.
If this callback is not NULL, the uninit callback will be called on allocation failure.
@return 0 on success, AVERROR code on failure (but the code will be dropped and treated as ENOMEM by the calling code)