Vidu Video Upload Failed? Reference Video Specs (Q2 Pro) & Fixes
Vidu accepts reference videos in Q2 Pro reference-to-video: 1 to 8 seconds, up to 50MB, MP4, MOV or AVI, together with reference images. See why clips are refused and how to prepare them.
Why won't Vidu accept my video?
Vidu is best known for image-to-video and reference-to-video generation, and most Vidu modes take images only. Video input is available in the Q2 Pro reference-to-video model, where a short clip guides the motion and action of the new shot alongside your reference images.
Because the video is a reference rather than something Vidu edits directly, the limits are tight: a short duration, a 50MB cap per file, and reference images are required as well. Knowing these before you export saves a lot of failed uploads.
Vidu Q2 Pro reference video limits
1 or 2 videos. One video: 1–8 seconds. Two videos: 1–5 seconds each. Up to 50MB each, MP4, MOV or AVI, aspect ratio between 1:4 and 4:1. Videos must be sent together with 1–4 reference images. Output is 24 FPS.
Two videos means shorter clips
A single reference video can run up to 8 seconds. As soon as you add a second one, the limit drops to 5 seconds for each clip. A 7-second clip that worked on its own will be refused when you pair it with another, so trim both to 5 seconds or less before adding the second video.
A video alone is not enough
In reference-to-video, a video cannot be the only input. You need at least one and up to four reference images as well, for example the character or product that should appear in the result. A missing image can look like an upload problem even when the video file itself is fine.
50MB fills up fast
Phones record at very high bitrates. Eight seconds of 4K 60 FPS iPhone footage can already be over 50MB. Since Vidu only uses the clip as a motion reference, converting to 1080p H.264 at 24 FPS keeps all the movement information you need while bringing the file far below the limit.
Match the 24 FPS output
Vidu renders its results at 24 FPS. If your reference is 30 or 60 FPS, the generated shot will not line up frame for frame with the original, and timing can drift when you place it back on your timeline. Converting the reference to a constant 24 FPS keeps input and output on the same frame rate.
Extreme aspect ratios
The frame must sit between 1:4 and 4:1. Ultra-wide screen recordings, panoramas or very tall stacked videos fall outside that range. Crop to a standard 16:9, 9:16 or 1:1 frame before upload.
Common reasons Vidu refuses 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.
Prepare your video for Vidu
Trim the reference to 8 seconds or less, or 5 seconds each if you use two, and convert to MP4 with H.264 at a constant 24 FPS, 1080p or below, under 50MB.
FixMyVideoForAI does all of this inside your browser, so your footage never leaves your computer. Add your reference images in Vidu as usual after uploading the converted clip.
Convert to Compliant Video Now (Vidu)
Safely convert in your browser to MP4 + H.264 + CFR without software installation.
Frequently Asked Questions
Video input is available in the Q2 Pro reference-to-video model. Most other Vidu modes, such as image-to-video, take images only.