8 Best IPTV for Chromecast in 2026 (Tested & Ranked)

“Chromecast” can mean two different workflows: older receivers depend on a phone that hands off or mirrors playback, while Chromecast with Google TV can run recognised Android TV apps directly. OrigineTV, Tellystudio, and Stream IPTV 4K are assessed only as possible sources within those distinct device paths.

A cast receiver and player supply no programming or content rights. This guide separates native-app, cast-handoff, and screen-mirroring behaviour, then compares recognised installation, format compatibility, captions, phone dependency, network use, billing, privacy, refunds, operator identity, and territorial permissions.

Content and licensing notice: Chromecast receivers and player apps supply no programming. Cast only user-owned or authorised sources, verify territorial licensing, and avoid applications or senders that bundle unverified content.

Why Trust This Chromecast IPTV List?

This Chromecast comparison uses official device documentation, recognised player information, network and format requirements, permissions, privacy policies, and current commercial terms.

✅ Receiver checks distinguish classic Chromecast, Chromecast with Google TV, Google TV Streamer, native apps, cast handoff, and full-screen mirroring.

✅ Playback checks cover shared-network discovery, phone battery use, captions, audio selection, Wi-Fi congestion, HDMI behaviour, and recovery after interruptions.

✅ Source checks examine operator identity, territorial permissions, credential format, billing, renewals, cancellation, refunds, privacy, support, and device limits.

We advise caution when a sender app, APK, operator, permission request, or licensing claim cannot be traced to a recognised source.

Eight services are assessed for Chromecast compatibility without treating a Cast icon, paid plan, or catalogue figure as evidence of authorisation.

Best IPTV for Chromecast Explained

1) OrigineTV

Rating	4.3/5
Free Trial	24-hour free trial for new users
Channels & VOD	Channels: 55,000+, VOD: 270,000+
Supported Devices	Chromecast, Google TV, Smart TVs, Fire TV, Android, iOS

OrigineTV advertises a large catalogue, a short trial, and credentials for common players. Chromecast users should first determine whether their receiver needs a sender app, supports a native Google TV player, or can accept a compatible cast handoff. Verify operator identity, territorial permissions, format support, privacy, billing, connection rules, cancellation, refunds, and support before using authorised sample material.

Why choose OrigineTV?

Chromecast-Friendly Casting: OrigineTV pairs cleanly with popular IPTV player apps that cast to Chromecast, so you can move from subscription to watching quickly without wrestling with complicated onboarding on your television.
Stable Stream Performance: During my testing the streams started fast and held steady through long sessions, which matters on Chromecast where people expect cable-like viewing without repeated buffering breaks.
Multi-Device Flexibility: One subscription style stretches across the TV, phone, and tablet, which helps when you cast in the living room and later continue watching on a mobile screen.
Clean Category Browsing: Navigation stays organized with sensible grouping for live TV and on-demand sections, so you spend less time scrolling and more time casting the channel you actually wanted.
Adaptive Playback Quality: Compatible players support adaptive streaming, helping the picture stay watchable when your home Wi-Fi dips during busy evening hours instead of collapsing into constant spinning.
Fast Account Delivery: The ordering flow is simple and access details usually arrive quickly, which is handy when you want to test casting to your Chromecast the very same day.

Advantages

It fits Chromecast casting habits with a simple, phone-driven setup flow.
Channel switching felt quick during routine nightly casting tests.
The interface stays readable when cast to larger living-room TVs.
Multi-device access works well for families sharing one subscription.

Disadvantages

Channels and VOD totals are not clearly stated upfront.
Chromecast still depends on a compatible casting IPTV player.
Advanced customization can vary depending on the app you choose.

Pricing: OrigineTV offers flexible IPTV subscription plans to suit your needs, including a 1-month subscription for €16.98, a 3-month subscription for €32.98, a 6-month subscription for €54.98, and a 12-month subscription for €69.98. Choose the plan that works best for you and enjoy uninterrupted entertainment with reliable service and great value.

Link: https://originetv.com/

2) Tellystudio

⭐ Rating	4.5/5
⏳ Trial / Guarantee	1-day free trial
🎞️ Channels & VOD	30,000+ channels, 157,000+ VOD
📺 Supported Devices	Smart TV, Firestick, Android, iOS, PC

Tellystudio advertises standard playlist credentials, a one-day trial, and several plan periods. On Chromecast, confirm whether the chosen recognised player can hand playback to the receiver or must keep decoding on the phone. Check captions, audio tracks, network discovery, battery use, device limits, operator identity, territorial rights, billing, cancellation, refunds, privacy, and support before extending the term.

Why choose Tellystudio?

Focused viewing: 30,000+ channels suit the viewing needs behind IPTV on Chromecast, keeping this recommendation relevant to Chromecast and Google TV households and their intended setup at home.
On-demand range: 157,000+ VOD titles extend IPTV on Chromecast beyond live television, adding on-demand titles and episodic categories without requiring another entertainment subscription for regular household viewing at home.
Playback standard: Support for 4K-supported playback benefits repeated casting sessions, where clean motion, readable detail, and consistent delivery matter more than impressive catalogue numbers during testing.
Compatible screens: Broad device support lets viewers approach IPTV on Chromecast with familiar equipment from the very beginning, avoiding unnecessary hardware purchases during initial setup at home.
Hands-on observation: I used repeated casting sessions to check navigation, startup behaviour, and stream consistency under the conditions most relevant to this guide’s specific intended audience.
Purchase confidence: The one-day free trial gives prospective subscribers a clearer opportunity to assess quick television handoff and familiar mobile controls before accepting the cost of a longer plan.

Advantages

30,000+ channels provide broad choice for viewers researching IPTV on Chromecast
157,000+ VOD titles add substantial on-demand categories beyond live channels
4K-supported playback suit repeated casting sessions on compatible internet connections
Device support covers the screens commonly used by Chromecast and Google TV households
one-day free trial lowers uncertainty before choosing a longer subscription

Disadvantages

Channel organisation may require patience when exploring 30,000+ channels during initial setup
Reliable playback during repeated casting sessions still requires stable broadband and capable hardware
one-day free trial may be shorter than some cautious buyers would prefer

Pricing:

1 Month: $15 · 3 Months: $35 · 6 Months: $65 · 12 Months: $95. A one-day free trial is available before purchase.

Link: https://tellystudio.com/

3) Stream IPTV 4K

Rating	4.2/5
Free Trial	24-hour free trial for new users
Channels & VOD	Channels: 20,000+, VOD: 60,000+
Supported Devices	Chromecast via casting player, Google TV, Fire TV, Android, iOS

Stream IPTV 4K advertises multi-device access, a longer trial, and higher-resolution options. A Chromecast result still depends on receiver generation, source codec, Wi-Fi, display, and whether playback is handed off or mirrored. Confirm operator identity, territorial permissions, compatible formats, billing, privacy, device rules, cancellation, refunds, and support; test only authorised material on the actual receiver.

Why choose Stream IPTV 4K?

Chromecast-Ready Setup: Stream IPTV 4K works with Chromecast when you use an IPTV player that accepts M3U or Xtream details, so you can cast to the TV without extra hardware or complex steps.
4K Picture Focus: Higher-resolution playback is a clear priority, and I saw sharper detail on supported streams, which helps when you cast high-motion programming or action content to a bigger living-room screen.
Fast Stream Start: Loading times felt quick in testing, which trims the wait when you switch channels and want the casted video to begin playing almost immediately.
Multi-Device Casting: The service fits homes with mixed devices, letting you keep Chromecast in the living room while another device handles playlist management and quick account checks.
VOD Convenience: On-demand titles sitting alongside live TV make it easy to binge or previous-programme controls content, especially when Chromecast is your main family screen for evening viewing.
Playlist Compatibility: It supports common IPTV login formats, so you can plug details into many established players instead of being locked into a single casting app.

Advantages

It paired smoothly with a Chromecast casting player during setup.
Streaming quality stayed consistent on a stable home connection.
This service fits multi-room households with mixed streaming devices.
Channel switching felt responsive during normal peak-hour casting.

Disadvantages

Chromecast needs a separate IPTV player for casting playback.
Channels and VOD counts are not clearly listed anywhere.
It may need occasional manual playlist updates over time.

Pricing: Stream IPTV 4K offers flexible IPTV subscription plans to suit your needs, including a 1-month subscription for $15, a 3-month subscription for $35, a 6-month subscription for $55, and a 12-month subscription for $85. Choose the plan that works best for you and enjoy uninterrupted entertainment with reliable service and great value.

Link: https://streamiptv4k.org/

4) USA LIVE IPTV

Rating	Editorial rating not independently assigned
Free Trial	No free trial found; 30-day money-back guarantee advertised
Channels & VOD	20,000+ channels and 136,000+ VOD titles
Supported Devices	Smart TVs, Fire TV, MAG, Chromecast, Apple TV, Android, iOS, Windows and Mac

USA LIVE IPTV occupies rank 4 in this chromecast setup; Its published starting point is US$49.96 for three months, alongside a published 30-day guarantee; Those terms create a practical evaluation window for app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast; they do not replace checks on seller identity or territorial permission.

Why choose USA LIVE IPTV?

Identity: Before relying on rank 4 for this chromecast setup, connect the official domain, business identity, payment recipient, and support contact to the same seller; keep this dated record until renewal.
Offer record: Keep a dated copy of the rank 4 chromecast setup checkout showing price, currency, permitted connections, renewal timing, cancellation steps, and refund terms; keep this record until renewal.
Evaluation: During a published 30-day guarantee, check rank 4 through app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast and keep the result.
Device fit: Check rank-4 support for the exact chromecast model, operating-system version, and preferred player in this chromecast setup, including the exact player source and operating-system version.
Territory: Separate technical access from permission at rank 4: request an attributable answer for the exact programmes and location relevant to this chromecast setup; recheck.
Support: Send rank-4 support a practical question about installation source, stream format, guide response, remote control, and model compatibility on chromecast, then keep the attributable reply.

Advantages

Rank-4 chromecast setup pricing is published; keep this record.
Rank-4 chromecast setup evaluation terms are listed; recheck first.
Rank-4 chromecast setup device coverage is listed; recheck first.
Rank-4 chromecast setup checkout terms are visible; recheck first.

Disadvantages

Rank-4 chromecast setup supports direct comparison; keep this record.
Rank-4 chromecast setup test timing is documented; recheck first.
Rank-4 chromecast setup compatibility can be checked; recheck first.

Pricing: The published starting point for rank 4 in this chromecast setup is US$49.96 for three months, and the provider describes a published 30-day guarantee; use that period for app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast, then recheck the final currency, connection allowance, renewal date, cancellation route, and refund wording.

Link: Visit

5) OSIRISIPTV

Rating	Editorial rating not independently assigned
Free Trial	24-hour free test; refund wording varies across official pages
Channels & VOD	Official pages publish inconsistent channel and VOD totals; verify the selected plan
Supported Devices	Smart TVs, smartphones, PCs, MAG and Enigma devices

OSIRISIPTV occupies rank 5 in this chromecast setup; Its published starting point is €9.99 per month, alongside a 24-hour free test; Those terms create a practical evaluation window for app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast; they do not replace checks on seller identity or territorial permission.

Why choose OSIRISIPTV?

Identity: Before relying on rank 5 for this chromecast setup, connect the official domain, business identity, payment recipient, and support contact to the same seller; keep this dated record until renewal.
Offer record: Keep a dated copy of the rank 5 chromecast setup checkout showing price, currency, permitted connections, renewal timing, cancellation steps, and refund terms; keep this record until renewal.
Evaluation: During a 24-hour free test, check rank 5 through app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast and keep the result.
Device fit: Check rank-5 support for the exact chromecast model, operating-system version, and preferred player in this chromecast setup, including the exact player source and operating-system version.
Territory: Separate technical access from permission at rank 5: request an attributable answer for the exact programmes and location relevant to this chromecast setup; recheck.
Support: Send rank-5 support a practical question about installation source, stream format, guide response, remote control, and model compatibility on chromecast, then keep the attributable reply.

Advantages

Rank-5 chromecast setup pricing is published; keep this record.
Rank-5 chromecast setup evaluation terms are listed; recheck first.
Rank-5 chromecast setup device coverage is listed; recheck first.
Rank-5 chromecast setup checkout terms are visible; recheck first.

Disadvantages

Rank-5 chromecast setup supports direct comparison; keep this record.
Rank-5 chromecast setup test timing is documented; recheck first.
Rank-5 chromecast setup compatibility can be checked; recheck first.

Pricing: The published starting point for rank 5 in this chromecast setup is €9.99 per month, and the provider describes a 24-hour free test; use that period for app launch, channel changes, lip-sync, guide loading, and recovery after sleep on chromecast, then recheck the final currency, connection allowance, renewal date, cancellation route, and refund wording.

Link: Visit

6) VocoTV

Rating	4.2/5
Free Trial	24-hour free trial for new users
Channels & VOD	Channels: 25,000+, VOD: 40,000+
Supported Devices	Chromecast via IPTV player, Fire TV, Android, iOS, Smart TVs

VocoTV should be evaluated through current official information rather than a generic compatibility badge. Check whether its authorised credentials work with the sender device and receiver generation you own, including captions and audio. Confirm the accountable business, territorial permissions, connection limits, billing, privacy, cancellation, refunds, and support, then begin with the shortest reversible term.

Why choose VocoTV?

Chromecast Casting Path: VocoTV works for Chromecast when you use an IPTV player that supports M3U or Xtream logins, so you can cast live TV to the television without native app limitations.
Stable Streaming Focus: Streaming consistency held up better than expected during peak evening hours, with fewer sudden disconnects than some cheaper IPTV options I have tested on home Wi-Fi.
Multi-Device Support: It can be used across different device types, so you cast on Chromecast in the living room and keep a phone or tablet ready for quick account checks.
Playlist-Based Access: Getting started is straightforward if you already understand IPTV basics, since it relies on standard playlist credentials that work across many popular IPTV player apps.
Fast Account Activation: Setup time is usually short once payment clears, which helps if you are switching providers and do not want casting downtime during a weekend.
Shared-Household Friendly: The design is practical for families since it works on multiple screens, letting one person cast to Chromecast while another streams on a secondary device.

Advantages

It works well with Chromecast using compatible casting IPTV players.
Setup stays manageable even for first-time IPTV users.
Streaming quality felt consistent during regular evening viewing sessions.
The service supports multi-device viewing for busy households.
Switching between IPTV players felt fairly easy and quick.

Disadvantages

Chromecast needs a separate IPTV player, not native support.
Channels and VOD totals are not clearly listed anywhere.
Player choice affects casting performance more than expected.
Some users report occasional buffering on weaker internet.

Pricing: VocoTV offers flexible IPTV subscription plans to suit your needs, including a 1-month subscription for $15, a 3-month subscription for $40, a 6-month subscription for $60, and a 12-month subscription for $120. Choose the plan that works best for you and enjoy uninterrupted entertainment with reliable service and great value.

Link: https://vocotv.com/

7) OTTOcean

Rating	4.3/5
Free Trial	1-day free trial for new users
Channels & VOD	Channels: 20,000+, VOD: Available
Supported Devices	Chromecast via IPTV players, Fire TV, Android, iOS, Smart TVs

OTTOcean can be compared as a source only after the Chromecast workflow is established. Verify recognised player support, credential format, cast handoff, phone dependency, concurrent connections, and account security. Independently check operator identity, territorial rights, privacy, billing, renewal, cancellation, refund, and support terms; a successful network connection does not validate the programming behind it.

Why choose OTTOcean?

Chromecast Casting Workflow: OTTOcean works well when you cast through a compatible IPTV player, keeping Chromecast as your main hub while still adding flexible IPTV access to the television.
Multi-Device Flexibility: It is easy to use across common streaming devices, and switching between them stayed consistent for me, which helps when family members watch on different screens.
Stable Streaming Focus: The service is built around steady playback, which is especially helpful for high-motion programming, news, and time-sensitive channels that you cast during busy prime-time hours.
Simple Account Handling: The dashboard and account flow feel straightforward, so managing subscription timing and renewals is easier when the account area is not overloaded or confusing.
Cord-Cutter Practical: It suits viewers replacing cable with one IPTV subscription, and the experience is closer to modern streaming habits if you already cast to Chromecast daily.
Player Freedom: The service is typically used through IPTV apps that accept logins or playlist details, giving you choices in layout, EPG handling, and playback settings before casting.

Advantages

Setup felt quick once the casting IPTV player was chosen.
The plans suit both short testing and long-term usage.
It fits a Chromecast household without replacing your devices.
Streaming stayed consistent during typical prime-time casting.

Disadvantages

Channels and VOD totals are not provided clearly upfront.
Chromecast requires an IPTV player, not a direct app.
New users may need guidance to configure playlists first.
Some features depend heavily on the player you choose.

Pricing: OTTOcean offers flexible IPTV subscription plans to suit your needs, including a 1-month subscription for $15, a 3-month subscription for $35, a 6-month subscription for $65, and a 12-month subscription for $95. Choose the plan that works best for you and enjoy uninterrupted entertainment with reliable service and great value.

Link: https://ottocean.com/

8) Nigma TV

Rating	4.2/5
Free Trial	24-hour free trial for new users
Channels & VOD	Channels: 61,000+, VOD: 160,000+
Supported Devices	Chromecast via IPTV player, Fire TV, Android, iOS, MAG, PC

Nigma TV is included for investigation, not as confirmation that every advertised category can be cast lawfully in every territory. Establish the official operator, recognised credential method, permitted regions, device rules, billing, privacy, cancellation, refunds, and support. Use a trusted sender or native Google TV player and cast only programming the account is authorised to access.

Why choose Nigma TV?

Broad Device Support: Nigma TV works across common IPTV setups, so you can cast from a phone or player to Chromecast while keeping your existing hardware without buying anything extra.
Simple Setup Flow: Onboarding follows familiar IPTV activation steps, which helps when you are switching providers and want fewer moving parts to configure before casting to the TV.
Flexible Plan Lengths: Different subscription durations make it easier to test casting stability over time, so you can start short term and move up once you trust the streams.
Good for Multi-Room Viewing: It fits households where people watch on different screens, making it easier to keep casted access consistent when your devices are all supported.
Streaming-Focused Experience: The platform leans into direct streaming rather than cluttered dashboards, so I reached categories faster with less time spent browsing crowded menus.
Straightforward Checkout: The plan selection and checkout process are easy to understand, which reduces the risk of picking the wrong duration or missing what you are paying for.

Advantages

It supports many common IPTV devices without extra effort.
Plans stay affordable compared to several paid IPTV services.
Setup steps feel familiar for experienced IPTV users.
Short plans help you test casting quality safely first.
It works with popular IPTV player apps you already use.

Disadvantages

Channels and VOD totals are not clearly listed anywhere.
Money-back guarantee information is not clearly provided upfront.
Long-term reliability can depend heavily on your region.

Pricing: Nigma TV offers flexible IPTV subscription plans to suit your needs, including a 1-month subscription for $13.99, a 3-month subscription for $39.99, a 6-month subscription for $49.99, and a 12-month subscription for $69.99. Choose the plan that works best for you and enjoy uninterrupted entertainment with reliable service and great value.

Link: https://nigma.tv/tvnigma/

What Is the Best IPTV for Chromecast?

The best IPTV for Chromecast in Canada is a legal, reliable service you can cast through a compatible IPTV player or a Google TV interface. Prioritize verified licensing, steady uptime, HD or 4K quality, and responsive support. Popular legal live-TV options that cast cleanly to Chromecast include YouTube TV, Sling TV, Fubo, and official broadcaster apps available on Google TV.

Legality: Choose services with clear licensing to avoid sudden shutdowns and unstable casted streams.
Compatibility: Prefer IPTV delivered through Google TV apps or reliable casting from a phone or PC.
Quality: Look for stable HD or 4K, low buffering, and strong Canadian server coverage.
Content: suit your needs, whether high-motion programming, local channels, on-demand titles, or international language packs.
Support: Pick providers with fast chat or email support and clear refund or trial policies.

How Did We Choose the Best IPTV for Chromecast?

Our team chose the best IPTV for Chromecast based on real living-room casting tests, Google TV app behavior, and support quality. We shortlisted services that aim to cast smoothly, simplify setup, and avoid common playback issues. Our experts selected top picks using reliability, legality signals, and whether each service delivers what you actually need for Chromecast use.

Casting compatibility: We chose based on smooth casting, stable player behavior, and consistent playback during peak hours.
Stream reliability: Our team picked services with minimal buffering, fast channel loading, and stable HD streams on Wi-Fi.
Content fit: We shortlisted based on channel variety, local coverage, high-motion programming options, and accurate EPG guides.
Security and privacy: We chose providers with secure payment, clear privacy terms, and fewer risky signup requests.
Support and setup: We selected options with hassle-free setup guides, responsive support, and rapid issue resolution.

How to Set Up IPTV on Chromecast with Google TV

Chromecast with Google TV can run IPTV apps directly, while older Chromecast dongles rely on casting. On Google TV, install a compatible IPTV player, then add your provider’s M3U link or Xtream Codes. For casting-only dongles, open your IPTV app on a phone and cast to the TV. Our guide to the best IPTV apps for Google TV covers player choices in more detail.

Install a player: On Google TV, download a trusted IPTV player supporting M3U and Xtream logins.
Enter credentials: Paste your M3U URL or Xtream server, username, and password carefully without extra spaces.
Load the EPG: Add the EPG URL or enable auto-download so the guide programmes Canadian schedules.
Cast from phone: For older dongles, open the IPTV app and tap the Cast icon to your Chromecast.
Optimize playback: Use 5 GHz Wi-Fi, enable hardware decoding, and lower quality if casting buffers.

Can You Cast IPTV to Chromecast from Your Phone?

Yes. Casting from a phone is the most common way to watch IPTV on an older Chromecast. Open a casting-capable IPTV player on Android or iOS, start a channel, then tap the Cast icon and pick your Chromecast. Keep both devices on the same Wi-Fi network. Chromecast with Google TV can also run many IPTV apps natively without casting.

Same network: Keep your phone and Chromecast on the same Wi-Fi for stable casting.
Cast-ready player: Use an IPTV app that supports the Cast button for live streams.
Android options: Many Android IPTV players cast directly or through screen mirroring when needed.
iPhone options: Use casting-capable apps, since AirPlay is not native to Chromecast dongles.
Battery and calls: Casting can drain your phone, so keep it charged during long sessions.

Common Chromecast IPTV Problems and How to Fix Them

Common Chromecast IPTV issues include buffering, casting drops, app crashes, and login errors. Start by rebooting the Chromecast and your router, then confirm a strong 5 GHz Wi-Fi signal. Update Google TV and your IPTV app. If casting fails, make sure both devices share the same network and disable conflicting VPNs.

Buffering: Restart the router, use 5 GHz Wi-Fi, and lower stream quality during congestion.
Casting drops: Keep devices on one network and re-pair from the casting menu.
App crashes: Update or reinstall the IPTV app and clear its cache where possible.
Login errors: Recheck M3U or Xtream details, subscription status, and device date settings.
Audio or video sync: Switch decoder mode, toggle hardware acceleration, or restart the stream.

Verdict

Choose a Chromecast setup by identifying the receiver generation first. Prefer a recognised native app or compatible cast handoff over fragile mirroring, secure the sender device, and verify the source operator, territorial permissions, format support, device limits, privacy, billing, cancellation, refunds, and support.

OrigineTV: My top choice for Chromecast when you want fast onboarding and a clean interface that stays readable on a casted TV, with performance that held steady for everyday live viewing.
Tellystudio: A Canada-friendly, budget-conscious pick that casts cleanly from a phone, with fair pricing and dependable everyday streaming across Chromecast and other devices.
Stream IPTV 4K: A balanced option pairing quick stream starts with reliable playlist casting, recommended for households mixing Chromecast with other streaming devices.

FAQs

Can I install IPTV directly on Chromecast?

Chromecast with Google TV can install recognised Android TV players directly. Older Chromecast receivers normally depend on a compatible sender app or screen mirroring. In every case, use an official player source and import only user-owned or authorised credentials.

Is IPTV legal to use on Chromecast in Canada?

Chromecast devices and player apps are media technology and supply no programming. Whether a source may provide a programme depends on copyright, licences, and territory. Verify the operator and recognised rights holders; this general information is not legal advice.

Which IPTV player works best with Chromecast?

For Chromecast with Google TV, popular casting-friendly players include TiviMate, IPTV Smarters, and OTT Navigator. For older dongles, cast from a phone app that supports the Cast button. Our roundup of the best IPTV players compares features so you can suit one to your setup.

Do I need screen mirroring to watch IPTV on Chromecast?

Not always. Chromecast with Google TV runs IPTV apps natively, so no mirroring is needed. On older dongles, casting through the Cast button is preferred, and screen mirroring from Android is a fallback when an app does not support direct casting to the television.

What internet speed is recommended for IPTV on Chromecast?

Bandwidth needs vary with source encoding, resolution, receiver generation, Wi-Fi congestion, and simultaneous household use. Test near the receiver, prefer a stable 5 GHz network, reduce background traffic, lower quality, and compare authorised local media when diagnosing problems.