Fix Slow-Motion Audio Track

I have a single MP4 clip, of 7min long, that was shot on a phone at 30 fps. The picture is fine, but the soundtrack plays back in what feels like slow motion—speech is drawn out, pitch is lower than normal, and the result is generally distorted. The actual length of the video is 3:50 if the sound was fine.

I’ve already tried the obvious tricks (changing the video FPS, speeding the audio, basic resampling in Audacity), yet the problem remains. I need someone who can dig deeper—perhaps identifying a sample-rate mismatch or other encoding glitch—and deliver a clean, correctly timed track that sits perfectly with the existing video.

Please return: • The repaired audio as a high-quality WAV or AIFF • The original MP4 with the corrected audio muxed back in (same resolution and visual quality)

Acceptance criteria are simple: playback in any standard player must sound natural, stay in sync from start to finish, and be free of the current distortion. If you typically work with tools such as Adobe Audition, iZotope RX, Reaper, or FFmpeg, let me know—whatever gets the job done accurately is fine by me. Budget: EUR 8–30 Skills: Audio Services, Sound Design, Video Editing, Audio Production, Audio Processing, Audio Editing, Adobe Audition, Audio Engineering