2012Forum Video Assist and Video Accessories
Transmetteurs HDMI sans fil pour applications vidéo et grand public professionnels
Il y a 14 ans. Le matériel et les prix ont peut-être changé depuis.
Ce que le fil a révélé
- Les anciens émetteurs HDMI sans fil avaient des retards d'environ 500 millisecondes, tandis que les nouveaux modèles atteignent généralement 1 à 5 millisecondes de latence.
- De nombreux systèmes HDMI sans fil de qualité grand public ont une portée limitée, généralement de 30 pieds ou moins, bien que certains modèles professionnels prétendent 100-300 pieds avec une ligne de vue claire.
- Les caméras Canon 5D Mark II subissent environ 13 secondes de délai de remaniement du signal lorsque le bouton d'enregistrement est pressé, ce qui fait chuter la sortie HDMI de 1080p à 480p résolution.
- Canon 7D cameras maintain consistent resolution when recording begins, making them compatible with wireless HDMI systems without the reconnection delay seen on 5D models.
- Most consumer wireless HDMI devices operate on 5V power via USB, while professional solutions may require AC power or D-Tap connectors.
- Wireless HDMI systems operating in the 5.1-5.9 GHz frequency band commonly suffer from reduced range and reliability when located near lighting equipment or in RF-heavy environments.
- Lilliput external monitors exhibit slow menu response times, limited aspect ratio options, and incompatibility with many camera formats.
- External monitors and wireless transmitters can generate RF interference that degrades receiver sensitivity and effective transmission range.
- Uncompressed wireless HDMI solutions require converters like the Decimator 2 or AJA units to translate between HDMI and HD-SDI formats, adding significant cost.
- Reconnection time after signal loss is a critical issue for some wireless systems, with delays up to 7 seconds or more at distance before stable video returns.
Dépend de
- Information from 2012, technology has advanced significantly since then.
- Testing was performed in limited conditions and may not represent all real-world scenarios.
- Claims about range and performance vary by model and testing environment.
- Many product links and availability information are outdated.
- Reconnection times and interference issues are reported anecdotally without systematic comparison.
- Professional wireless HDMI solutions discussed are high-cost and require additional format conversion equipment for HD-SDI workflows.