{"id":3501,"date":"2025-10-30T17:17:16","date_gmt":"2025-10-30T09:17:16","guid":{"rendered":"https:\/\/crepal.ai\/blog\/?p=3501"},"modified":"2025-10-30T17:17:18","modified_gmt":"2025-10-30T09:17:18","slug":"runway-gen-4-2025-auto-voiceovers-subtitles-guide","status":"publish","type":"post","link":"https:\/\/crepal.ai\/blog\/aivideo\/runway-gen-4-2025-auto-voiceovers-subtitles-guide\/","title":{"rendered":"Runway Gen-4 2025: Auto Voiceovers & Subtitles Guide"},"content":{"rendered":"\n

I opened Runway because my video rough cut felt empty, pretty visuals, zero voice. And I kept seeing people mention “runway gen4<\/a> voiceovers” like it was a magic button. So I did what I always do: made coffee, blocked an hour, and decided to see if Gen\u20114 could actually help me narrate without sounding like a robot. Spoiler: it’s not perfect, but a few things clicked hard enough that I’d use it again. Here’s the messy, honest tour, what worked, what tripped me up, and the small tricks that saved me time.<\/p>\n\n\n\n

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Gen-4 Audio Features<\/h2>\n\n\n\n
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Tool<\/td>LUFS Measurement (Recommended Range)<\/td>Output Loudness (Generated Voice)<\/td>Notes<\/td><\/tr>
Runway Gen-4<\/td>-14 LUFS<\/td>-12 LUFS<\/td>Slightly higher than standard but ideal for social media content<\/td><\/tr>
Adobe Audition<\/td>-23 LUFS<\/td>-23 LUFS<\/td>More aligned with broadcast and audio production standards<\/td><\/tr>
Descript<\/td>-16 LUFS<\/td>-14 LUFS<\/td>Flexible loudness standard, adapts well to different content<\/td><\/tr>
Murf<\/td>-18 LUFS<\/td>-15 LUFS<\/td>Offers a variety of voices but lacks strict loudness normalization<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

AI Voice Generation<\/h3>\n\n\n\n
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First impression: the voice library isn’t enormous, but it’s\u2026 usable. I tested a friendly female voice for a travel reel, a neutral American male for a tutorial, and a softer British option because my brain associates British voices with authority (don’t @ me). The texture felt less plasticky than older AI voices I’ve tried: sibilance control is decent, and the breathing isn’t dramatic. You still get occasional flatness on long sentences, especially when I crammed too many commas, but it’s miles better than the monotone text-to-speech from last year.<\/p>\n\n\n\n

What surprised me:<\/p>\n\n\n\n