Luma Video Upload Failed? Modify Video Input Specs and Tips
Luma's Modify Video takes clips up to 10 seconds and 100MB and works at 24 FPS. See why longer clips are refused, how to keep your original audio, and how to prepare footage for clean results.
Why won't Luma accept my video?
Luma's Modify Video transforms footage you already have while keeping its motion and camera movement. You can restyle a scene, change a character or rework the environment, and choose how far the result should move away from the original.
The upload rules are short: 10 seconds or less and 100MB or less, with Luma working at 24 FPS. What makes a bigger difference is the footage itself. Stable shots on clean backgrounds transform far more reliably than shaky, crowded ones, so preparing the clip well matters as much as meeting the limits.
Luma Modify Video limits
Up to 10 seconds, up to 100MB, 24 FPS. Output at 720p or 1080p. The original audio is kept in the modified video.
Ten seconds is a hard limit
Videos uploaded to Modify Video can be up to 10 seconds long. A 10.5-second clip is refused just like a 30-second one. Trim to the exact moment you want to transform and keep it at a whole number of seconds, such as 6 or 8 seconds, so you know precisely how long the modified shot should be when you put it back in your edit.
Work at 24 FPS to keep frames matched
Luma lists 24 FPS as the frame rate for Modify Video. If your source is 30 or 60 FPS, the modified clip will not line up frame-for-frame with the original, and timing can drift when you place it back on your timeline. Converting the source to 24 FPS before upload keeps the input and the result on the same frame rate.
Your original audio stays
Unlike some platforms that drop the sound from video inputs, Luma keeps the original audio in the modified video. That makes it easy to transform the picture of a shot that has dialogue or sync sound without losing it. If you want different sound, you can add new audio afterwards.
Footage that transforms well
Luma recommends stable footage over shaky handheld shots, and clean, minimal backgrounds such as a blank wall, a greenscreen or a cyclorama when you plan to change the environment. Very fast action and several subjects moving at once are harder and can lose consistency. Choose the strength level to match the change you want: Adhere for subtle changes like lighting or texture, Flex for most transformations, and Reimagine for dramatic changes.
Common reasons Luma rejects or struggles with a video
AI video encoders require strict video specifications in browser and cloud AI server environments. Upload errors typically occur due to the reasons below.
Preparing a video for Luma
Select Luma AI in FixMyVideoForAI and drop in your clip. The tool checks length, file size, frame rate, resolution and codec and shows exactly what needs changing.
Converting trims the clip to 10 seconds or less at a whole number of seconds, re-encodes it to MP4 (H.264) at a constant 24 FPS and scales oversized footage down to 1080p to stay well under 100MB. Your original audio is kept. Everything runs inside your browser, so your footage never leaves your computer.
Convert to Compliant Video Now (Luma AI)
Safely convert in your browser to MP4 + H.264 + CFR without software installation.
Frequently Asked Questions
Up to 10 seconds. Trim longer clips to 10 seconds or less.