FAQ
TL;DR: "Miracast supports up to 1080p HD video" and if you see black‑screen‑with‑sound while mirroring, try settings tweaks or certified casting below. [Wi‑Fi CERTIFIED Miracast]
Why it matters: This helps Toshiba TV owners and Cyfrowy Polsat Go users quickly restore picture or pick a reliable workaround.
Quick facts:
- Miracast supports up to 1080p HD video and 5.1 surround sound, so network and device setup matter. [Wi‑Fi CERTIFIED Miracast]
- 4K streaming often requires HDCP 2.2 end‑to‑end; non‑compliant paths may blank video. [Watching Netflix in Ultra HD]
- Cyfrowy Polsat Go has a “video decoding by my device” toggle; switching it can restore video. [Elektroda, sylwiakrzesniak, post #19902640]
- On some Realme phones, enabling Wireless Display certification and setting Operating Channel to 1 fixes picture. [Elektroda, bolotcz, post #20114935]
- Playing via the Firefox browser on your phone, then mirroring, restored both audio and picture for users. [Elektroda, boskiogier0, post #21535504]
Quick Facts
- Miracast supports up to 1080p HD video and 5.1 surround sound, so network and device setup matter. [*Wi‑Fi CERTIFIED Miracast*]
- 4K streaming often requires HDCP 2.2 end‑to‑end; non‑compliant paths may blank video. [*Watching Netflix in Ultra HD*]
- Cyfrowy Polsat Go has a “video decoding by my device” toggle; switching it can restore video. [Elektroda, sylwiakrzesniak, post #19902640]
- On some Realme phones, enabling Wireless Display certification and setting Operating Channel to 1 fixes picture. [Elektroda, bolotcz, post #20114935]
- Playing via the Firefox browser on your phone, then mirroring, restored both audio and picture for users. [Elektroda, boskiogier0, post #21535504]
What causes a black screen with sound when mirroring Cyfrowy Polsat Go?
A common cause is the player’s video decoding mode conflicting with mirroring. In Cyfrowy Polsat Go settings, toggle “video decoding by my device” to the opposite state. Restart playback after the change. This simple switch can restore the picture. [Elektroda, sylwiakrzesniak, post #19902640]
How do I change the Cyfrowy Polsat Go video decoding setting?
Open the app’s player settings. Find the option labeled “video decoding by my device.” Switch it to the other state, then restart the stream. Test both positions to see which one works with your TV. [Elektroda, sylwiakrzesniak, post #19902640]
How can Realme users fix this by changing the Wireless Display channel?
Enable Wireless Display certification, then set Operating Channel to 1. “Operating Channel change the channel from automatic to ‘1’.” How‑To: 1. In Developer options, enable Wireless display certification. 2. Settings > Connection & sharing > Wireless display, turn it on. 3. In Wireless display options, set Operating Channel to 1. [Elektroda, bolotcz, post #20114935]
I can’t find “Wireless display certification” on Realme GT2 Pro—what then?
One report notes the GT2 Pro lacks visible certification options even with Developer options enabled. If you can’t find it, skip this method. Try the other fixes listed in this FAQ instead. [Elektroda, marcinmasiak84, post #20440806]
Does using Firefox on the phone restore video when mirroring?
Yes. A user confirmed that playing Cyfra/Netflix in Firefox, then projecting, shows picture plus sound. “The picture will also be there.” Start playback in Firefox before starting screen sharing. [Elektroda, boskiogier0, post #21535504]
Netflix casting works, but Polsat Go is black—why?
That mix is reported: Netflix casts fine, while Polsat Go mirrors as audio‑only. It suggests app‑specific handling differences. Apply the decoding toggle or the Realme channel steps above to regain video. [Elektroda, Santec, post #19287597]
My Xiaomi 11T has no sound, and Galaxy S7 crashes—what now?
Reports show varied symptoms by phone: no sound on Xiaomi 11T and connection crash on Galaxy S7 at playback start. This indicates device‑specific compatibility. Use the other listed workarounds. [Elektroda, mciborowski88, post #19868519]
Is the Canal+/Channel+ app affected similarly?
Yes. One user reported the same mirroring problem in the Channel+ app. That points to app‑level behavior across multiple services. [Elektroda, mciborowski88, post #19868519]
Will Chromecast or an HDMI cable avoid the black screen?
Yes. Casting with a Chromecast or connecting via HDMI generally bypasses phone‑TV mirroring quirks. This alternative offers a more stable path for protected playback. [Elektroda, JaidulMia, post #20453794]
Why do ads show video, then the episode turns black when mirrored?
A user observed that ads display fine, but the show video disappears while audio continues. This aligns with content handling differences. Use one of the listed workarounds to regain picture. [Elektroda, Czekolada160, post #19908366]
Could HDCP/DRM be blocking 4K or protected content?
Yes. Ultra HD playback requires HDCP 2.2 across the chain. Lacking HDCP can cause blank video or quality drops. If mirroring isn’t HDCP‑compliant, protected content may refuse video. Use a compliant device for 4K. [Watching Netflix in Ultra HD]
Do app updates help, or should I just wait?
Install updates and retest, but manage expectations. As one user noted, updates “fix old bugs and make new ones.” Recheck mirroring after each app or OS update. [Elektroda, artbi881, post #19291366]
Is this specific to Toshiba TVs?
This thread centers on Toshiba sets. Multiple reports mention Toshiba with the described symptoms. That’s the environment users here tested against. [Elektroda, mciborowski88, post #19868519]
What’s the fastest workaround if I need to watch now?
Open the service in Firefox on your phone, start playback, then mirror the screen. Users report this restores both picture and sound without extra hardware. [Elektroda, boskiogier0, post #21535504]
