The clapperboard – with its chalkboard to indicate a take number – is the time-honored time-alignment tool in the motion-picture industry. Bicycle video takes are generally rather long – you start recording, and then ride – so setting this marker isn't much of an inconvenience. We fall back on the classic synchronizing technique used in film: a marker visible in the image and audible in the sound track. How do we synchronize when shooting on a budget, lacking time code? I expect that a smartphone app will be offering GPS timing sooner rather than later, but smartphone cameras are rather limited, and this feature would be more useful in a dedicated camera. Some newer action cameras record a GPS track and time stamp, which may be used to align recordings in post-processing. GPS can also identify the location of a device to within a few meters, and the direction in which a camera is pointing, if it is moving. GPS can synchronize any number of cameras, anywhere on Planet Earth. This only works where GPS signals can penetrate - generally, not inside buildings - and is expensive and complicated to use. Some professional-grade equipment derives time code from GPS satellite signals. Time code also may be sent and received using wireless devices, but as of now, no consumer-grade action camera supports this feature. Time code can control the playback speed of analog audio tape, and can fast-forward and rewind tapes to synchronize them with each other. Time code traditionally uses a timing signal sent over cables and recorded along with the audio and video. If you are in the market for cameras, you might check for this feature.Ī high-tech way to synchronize video and audio recordings is called time code. Wi-fi will work with cameras on a single bicycle, controlled by the rider, or with people riding within a few meters of one another. Control may offer simultaneous starting and stopping, and even multiple views on a screen. Control of some of the newer action cameras, more than one at a time, is possible using wi-fi with a dedicated controller or smartphone.
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