Solo dev builds 54-second product demo using OBS, ffmpeg, and AI voiceover at zero cost

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A solo developer created a 54-second product demo for Convertify, a free image converter, using only OBS Studio, ffmpeg, and the AI voice tool openai.fm with no budget or team. OBS was configured at 1080p/60fps with a lower compression setting to ensure smooth motion and sharp text rendering in the screen recording. ffmpeg was used via command line to trim and crop the raw footage, avoiding the overhead of full video editing software. The AI voiceover, generated through openai.fm, was iterated six times across script rewrites at no cost, with the 'Ash' voice selected after testing four options for clarity and pacing. The developer noted that rewriting the script to lead with the user's problem rather than the product name significantly improved the final result after four drafts.

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