At NAB 2019 in Las Vegas, FiLMiC Pro (the most famous app for full control video recording on iOS and Android, which I have covered in many past articles) announced the FiLMiC Audio app, which can record 48 kHz 32-bit floating point audio and automatically sync Record/Pause with FiLMiC Pro wirelessly via WiFi, even without a WiFi network. Then it transfers and syncs the audio via WiFi with the video file in FiLMiC Pro.

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