Filtering callback. This is where a filter receives a frame with
audio/video data and should do its processing.
Input pads only.
@return >= 0 on success, a negative AVERROR on error. This function
must ensure that frame is properly unreferenced on error if it
hasn't been passed on to another filter.
Filtering callback. This is where a filter receives a frame with audio/video data and should do its processing.
Input pads only.
@return >= 0 on success, a negative AVERROR on error. This function must ensure that frame is properly unreferenced on error if it hasn't been passed on to another filter.