Video and audio compression: compatibility before savings
Separate codec, transport and bitrate control when sizing a recorder.
Updated
Principle and limits
H.264 and H.265 describe video coding families; RTP payload specifications describe how coded data is carried. Neither tells you the actual bitrate of a particular scene. CBR, VBR and vendor “smart codec” modes are separate settings. Audio is a separate stream with its own codec and permissions. Names such as AAC, G.711 or Opus are examples, not a declaration that every NVR supports them.
Installation and acceptance
Test live view, seek, playback and export in the intended browser, workstation and evidence player. Check audio synchronization when recording audio is authorized. A long keyframe interval can affect seeking and recovery; test interruption rather than assuming immediate recovery. Keep a supported fallback profile and measure the final recording stream.