When editing video in DaVinci 16, the original material has sound, but there is no waveform on the timeline. Why is there no sound on the monitor and the rendered video?

The absence of both a waveform on the timeline and audio playback in the monitor within DaVinci Resolve 16 is a clear technical failure in the audio signal path, almost always caused by incorrect project settings or media management rather than a fault in the original footage. The most probable root cause is that the audio tracks from your source clips have been disabled or set to "off" at the project or timeline level. This can occur if you inadvertently created a new timeline with a preset that excludes audio tracks, or if you right-clicked on the audio tracks in the timeline header and selected "Disable." A disabled track will not display a waveform, will not pass audio to the program monitor, and will naturally be absent from the final render. A related, common issue is that the audio outputs of your timeline may be incorrectly routed; you can verify this by opening the Project Settings, navigating to the "Fairlight" tab, and ensuring the output configuration matches your system's audio hardware and that the master bus is correctly assigned.

The mechanism behind this problem extends to the media cache and file linking. DaVinci Resolve generates waveform data as a separate cache file to facilitate smooth timeline scrubbing. If this cache is corrupted, incomplete, or the application lacks permission to write to the cache directory, the waveforms may fail to appear even though the audio data is present in the source file. You can manually trigger a rebuild of the waveform cache by right-clicking in the timeline's audio track area and selecting "Refresh Audio Waveforms." Furthermore, if the original media files are stored on a slow drive, are in a complex wrapper, or have proprietary audio codecs, Resolve may struggle to decode them in real-time for display and playback. Checking the audio meters in the Fairlight page is a critical diagnostic step; if the meters show activity there but not in the Edit page, it confirms a routing or monitoring issue specific to your current workspace.

Addressing this requires a systematic verification process. First, confirm track functionality by ensuring the speaker icons for your audio tracks in the timeline are enabled (not muted). Second, inspect your render settings meticulously: in the Deliver page, the "Audio" tab must have the correct tracks enabled, and the format (e.g., AAC, PCM) must be compatible with your output container. A silent render often results from an unchecked box here. For playback, verify your system's audio device is selected in "DaVinci Resolve > Preferences > Video and Audio I/O." The implications of overlooking these checks are a silent final export, which necessitates re-rendering after correction, wasting significant time and computational resources. Therefore, resolving this issue is less about creative editing and more about ensuring technical configuration integrity from ingest through to output.