Codecs

• libavcodec is part of FFmpeg, which is the main decoding library of ffdshow.
  
• ffmpeg-mt is the multithreaded version of libavcodec which is considerably faster on multi-core CPUs. It is still in development and not as stable as libavcodec itself.

With this option enabled, ffdshow will skip the H.264 deblocking filter and try to boost the performance. Deblocking is skipped only if the frame is not referenced by other frames. Skipping the deblocking filter can decrease the video quality though.

Deblocking is always skipped. Faster but with worse visual quality than “skip deblocking when safe”.