Decoder H.264 using Callback of Dahua SDK

I have a WPF project in the C # language that uses the Dahua SDK. I need to troubleshoot the following issues: - I tried to use the FFMPEG libraries (most current version) to decode the CAMERA VIDEO STREAM (H.264 format) and the frames are coming out cut in low quality (not so much) and in high quality (always). - Another problem is the constant increase of RAM when performing the decodings. (possibly because I'm not properly cleaning the pointers created in the unsafe areas of the code) ** Problems can be solved using another library (if necessary).