Streaming Cheat Sheet: Specs, Speeds and Fixes 2026

Last updated: · By WatchlyGuide Team

This is a quick-reference cheat sheet for streaming — the internet speeds, resolutions, codecs, data usage, HDMI/HDCP requirements and fast fixes you need, all in one place. Bookmark it and jump to the table you need. Every row links to a full guide when you want the detail behind the numbers.

A one-page streaming cheat sheet showing speed, resolution, codec and fix reference tables
The key streaming numbers and fixes at a glance — speeds, resolutions, codecs and more.

Tip: for definitions of any term below, see the streaming glossary. For the reasoning behind each number, follow the guide link in each section.

Internet Speed by Quality

Per stream — add them together for simultaneous viewers. Full detail in the internet speed guide.

Quality Resolution Recommended speed (per stream)
SD 480p ~5 Mbps
HD 720p ~10 Mbps
Full HD 1080p 15–25 Mbps
4K UHD 2160p 25 Mbps+

Household guide: 1 person ≈ 25 Mbps · couple with some 4K ≈ 50 Mbps · family ≈ 100 Mbps · heavy/large ≈ 200 Mbps+.

Resolutions

More on screen-size and distance in the resolution guide.

Resolution Pixels vs 1080p Best screen
720p (HD) 1280×720 ¼ Phones, small TVs
1080p (Full HD) 1920×1080 1× Up to ~43”
4K (UHD) 3840×2160 4× 50”+
8K 7680×4320 16× 75”+ (niche)

Codecs and Bitrate

Efficient codecs hit the same quality at lower bitrate — see video codecs and bitrate.

Codec Efficiency vs H.264 Notes
H.264 (AVC) Baseline Universal compatibility
H.265 (HEVC) ~40–50% better Great for 4K/HDR, licensed
AV1 ~50–60% better Royalty-free, recent devices

Typical 4K bitrate: ~15–25 Mbps (H.264) or ~8–15 Mbps (H.265/AV1).

Data Usage per Hour

Per stream — see the data usage guide.

Content Data per hour
SD video ~1 GB
HD (1080p) video ~3 GB
4K video ~7 GB (up to 10+)
Music (high) ~150 MB

1 TB cap ≈ 1,000h SD · 330h HD · 140h 4K.

Protocols and Manifests

Background in streaming protocols.

Protocol Manifest Used for
HLS .m3u8 Delivery to any device, live TV
MPEG-DASH .mpd On-demand delivery at scale
RTMP — Ingest from encoder to server

IPTV inputs: M3U/M3U8 playlist · Xtream Codes API (URL + user + pass) · portal URL. Add an EPG (XMLTV) for the guide.

HDMI and HDCP

Details in HDMI versions and HDCP explained.

Need Requirement
4K 60Hz HDR streaming HDMI 2.0a+ · Premium High Speed cable
8K / 4K 120Hz HDMI 2.1 · Ultra High Speed cable
4K protected content HDCP 2.2+ on every device in the chain
Atmos over one cable HDMI eARC

Quick Fixes

The fastest fixes for the most common streaming problems:

Problem First fix Guide
Buffering Wire up / 5 GHz, restart router, close downloads Wi-Fi vs Ethernet
Buffering when others download Enable QoS, prioritise video QoS
Video-only slowdown at peak Test with a VPN (throttling?) ISP throttling
Black screen on protected content Reseat cable, power-cycle, check HDCP 2.2 HDCP
HDR looks washed out / dim Use Cinema/Filmmaker mode, check brightness HDR
Plex/Jellyfin buffering Aim for Direct Play, avoid transcoding Transcoding vs Direct Play
Slow app/stream start Set a fast DNS (1.1.1.1, 8.8.8.8) DNS
EPG guide empty Match tvg-id to the EPG source EPG

Recommended Baseline Setup

  • Connection: 25 Mbps+ (more for multiple 4K streams), wired to the main TV.
  • Device: a capable 4K streaming device with HDMI 2.0a+ and HDCP 2.2.
  • Cable: Premium High Speed HDMI for 4K HDR.
  • Router: 5 GHz/6 GHz, clear channel, QoS on, placed high and central.
  • Privacy: a VPN on public Wi-Fi and to test for throttling.

The Bottom Line

Keep this cheat sheet handy: 5/10/15–25/25 Mbps for SD/720p/1080p/4K; H.265 or AV1 for efficient 4K; HDMI 2.0a and HDCP 2.2 for 4K HDR; and for buffering, wire up and restart before anything else. When you want the “why” behind any number, follow its guide link — or look up any term in the streaming glossary.

Frequently Asked Questions

What internet speed do I need for streaming?

Plan roughly 5 Mbps for SD, 10 Mbps for 720p, 15–25 Mbps for 1080p and 25 Mbps or more for each 4K stream. These are per-stream figures, so add them up for every device streaming at once. A stable connection matters as much as raw speed, so wired Ethernet often streams better than fast but erratic Wi-Fi.

What is the quickest fix for buffering?

The fastest fixes are to connect by Ethernet or move closer to a 5 GHz router, restart the router, and close background apps and downloads. If only streaming is slow while speed tests look fine, check for Wi-Fi interference or ISP throttling. A stable, wired connection prevents the large majority of buffering.

Which codec is best for streaming?

For compatibility, H.264 plays everywhere. For efficient 4K and HDR on modern devices, H.265 (HEVC) roughly halves the bitrate needed. For the best efficiency with no royalties on recent hardware, AV1 is best. Most services send the most efficient codec your device supports and fall back to H.264 for older ones.

Do I need HDMI 2.1 for 4K streaming?

No. HDMI 2.0a or later fully handles 4K at 60Hz with HDR, which is everything streaming services deliver. HDMI 2.1's extra bandwidth is for 8K and high-frame-rate gaming, not video streaming. For 4K streaming, make sure every device in the chain supports HDMI 2.0a and HDCP 2.2.

How much data does streaming use?

Roughly 1 GB per hour for SD, 3 GB for HD (1080p) and 7 GB for 4K, per stream. Music uses far less, about 40–150 MB per hour. A two-hour 4K film uses around 14 GB, so if you have a data cap, capping the resolution and downloading on Wi-Fi keeps usage under control.

What HDCP version do I need for 4K?

You need HDCP 2.2 or later for 4K protected content, and every device in the chain — streaming device, any receiver or soundbar, and the TV's HDMI port — must support it. If one link only supports older HDCP, 4K content may drop to HD or show a black screen instead of playing.