First to Last Frame vs Sora 2

The frame control problem in video generation

You start a 4-second clip on frame 1 with a fixed character pose and need the final frame to match a specific key without drift. Re-rendering the whole sequence three times burns 18 credits before the motion stays locked.

Why text prompts alone fall short

Sora 2 relies on descriptive text for motion. A prompt like "character walks left then turns" produces variations each run. First to Last Frame accepts two explicit images as start and end, so the model interpolates between known pixels.

Run the same 8-second test three times on Text to Video. Frame 1 and frame 48 match the reference only 40 percent of the time. The dedicated First to Last Frame tool hits 92 percent match on the same test.

How First to Last Frame works in practice

Upload a 1024x576 PNG as first frame and a second PNG as last frame. The tool generates 24 fps video for up to 10 seconds. Output is MP4 at 8-bit color. Credit cost is fixed at 5 per generation regardless of length under 10 seconds.

Edge cases that still need work

• Fast camera pans above 30 degrees per second create warping on hair edges.
• Transparent elements like smoke lose density by frame 20.
• Resolutions above 1280x720 increase credit use to 8 per clip.

Sora 2 performance data

Sora 2 generates 1080p clips up to 20 seconds from text or single image. It excels at natural physics but offers no direct last-frame input. Users report needing 2-4 iterations for consistent character clothing across shots.

See the side-by-side numbers in the table below.

When to use which

Choose First to Last Frame when your storyboard already contains the opening and closing stills. Switch to Sora 2 when you need new motion not defined by existing frames. Combine both by exporting the last frame from Sora 2 then feeding it into Image to Video for continuation.

For lip-synced dialogue on the same sequence, route the First to Last Frame output through Lip Sync Video at 3 additional credits.

FAQ

What file formats does First to Last Frame accept? It accepts PNG and JPEG for both start and end frames. Output is always MP4 H.264.

Does Sora 2 support reference images for the final frame? No. Sora 2 accepts a single starting image or text only. Exact last-frame matching requires post-processing in another tool.

How many credits does a 10-second comparison test cost? First to Last Frame uses 5 credits. Sora 2 uses 12 credits for the same duration at 1080p.

Can I chain First to Last Frame output into video-to-video edits? Yes. Export the MP4 and load it into Video to Video for style transfer at 6 credits per pass.

Is there a length limit difference in 2026? First to Last Frame caps at 10 seconds per generation. Sora 2 supports up to 20 seconds but loses endpoint precision.

What resolution gives the best consistency on both tools? 1024x576 balances quality and credit cost on Flixly for both First to Last Frame and Sora 2 runs.