Jitter describes variation in packet arrival timing. A player can absorb some variation with buffering, but larger or repeated gaps may interrupt playback. Average speed alone does not describe this timing behaviour or the available playback cushion.
Listen and watch separately
A brief network interruption may freeze both audio and video, while decoder problems can affect the picture differently. Note the symptom rather than labelling every stutter as jitter. Accurate observations make a network comparison more useful.
Keep a stable baseline
Use Ethernet if possible and pause heavy transfers for one comparison session. If the problem disappears, reintroduce normal household traffic. This does not measure jitter precisely, but it helps identify whether local contention is contributing.
Understand the buffer trade-off
More buffered media can tolerate a temporary delivery gap at the cost of later playback behind the live event. A larger buffer cannot rescue an unavailable feed or a connection that remains slower than the stream over time.
