If none of the above work, the problem is your network blocking Ucast’s protocol. Bypass it with a relay.
The most frequent cause of V461 is a simple typo. Unlike OBS or vMix, Ucast encoders do not always give you a detailed "invalid URL" message. Instead, they return a generic V461 handshake failure.
Corrupted firmware partition or incompatible cached settings from a previous Android Auto/CarPlay host device. The V461 chipset is sensitive to handshake timeouts and outdated protocol stacks.
Before applying a fix, ensure you are actually experiencing the V461 problem. Common symptoms include: ucast v461 fix
The Problem: The video looks great, but the talent's lips are 300ms off from the audio.
The Diagnosis: The Q461 processes video through a hardware encoder (fast) and audio through a DSP (slower). If you are using the 3.5mm mic input and HDMI audio, the two paths get desynced.
The Fix:
The Problem: You plug your camera into the Q461 via HDMI. The camera says it is outputting. The Ucast screen says "No Signal."
The Deep Diagnosis: The Q461 is notoriously picky about HDMI handshake protocols. Unlike a monitor, which will display almost anything, the encoder demands a strict EDID (Extended Display Identification Data) handshake. If your camera outputs 1080p59.94 and the encoder expects 1080p50, you get a black screen.
The Fix:
When all else fails, do not trust the backup/restore feature. I have seen corrupted config files cause the bonding logic to simply stop working.
The Nuclear Option:
The Problem: The Ucast app on your phone disconnects from the Q461 every 90 seconds, even when you are standing right next to it. If none of the above work, the problem
The Deep Diagnosis: The Q461 runs a hybrid Wi-Fi network. When it is bonding cellular signals, its internal Wi-Fi module gets "interrupt conflicts." This is a firmware-level scheduling bug. Ucast knows about it (firmware versions before 2.1.8 are especially bad).
The Fix: