12-second example · sel_area
Remove a solid security-cam date/time stamp from lab footage
A 12-second lab clip with an opaque black OSD box and green CAM-03 ticking time in the upper-left corner. Watch the input and the real sel_area API output with the exact region and charge.
sel_area- Clip length
- 12 s
- Source size
- 1280 × 720
- Recorded API charge
- $0.05625
- Processing
- 83.3 s
Measured 2026-10-20. USD API charge for 15 billable seconds; web points are separate. 110.1 seconds from submission to completion, including validation and queue time. This is a recorded run, not a latency guarantee.
When to use this workflow
Clear a burned-in camera-style date/time stamp from your own footage before reusing it.
Why this removal mode?
One 436 × 72 pixel box covers the full opaque OSD with a few pixels of margin, about 3.4% of the frame. The digits change every second but the box stays put, so a single fixed region is enough.
Result review
The opaque black OSD box and green CAM-03 time are gone in the reviewed frames. Soft out-of-focus lab tones continue through the region with no obvious box outline or residual digits at normal playback speed.
What this example cannot prove
The stamp sits over soft, out-of-focus lab background. This does not establish results when a stamp crosses faces, fine texture, or high-contrast edges.
No model version was returned by the public job response. One short clip cannot predict results for other footage. Check the full result at normal speed and around each word change.
Reproduce this API request
Upload your own authorized video first, then replace the upload ID. Coordinates refer to this example’s 1280 × 720 source pixels; recalculate them for a different video.
{
"type": "remove_text",
"input": {
"upload_id": "upl_your_uploaded_video"
},
"mode": "sel_area",
"rect": {
"x1": 16,
"y1": 20,
"x2": 452,
"y2": 92
}
}Send Authorization: Bearer $UNMARKAI_API_KEY from your server and a stable Idempotency-Key for this request. Never expose the key in browser code.
Source and demonstration method
Solid opaque security-cam OSD added for this test with ffmpeg: a filled black 420×56 px box and DejaVu Sans Mono Bold 28 px green (0x33FF66) text reading CAM-03 plus a ticking HH:MM:SS clock. Licensed footage trimmed to 12 s and scaled to 1280 × 720 at 25 fps. The after video is the actual API result, without manual cleanup.
Footage by Pressmaster on Pexels, used under the Pexels License. Prepared at 1280 × 720, H.264, 25 fps, with no audio. The comparison places the processed input and downloaded API output on the same timeline; only comparison labels and encoding are added.
Use owned or licensed footage for caption replacement. Keep attribution and required disclosures in content you publish.
Explore the next workflow
All video text removal examples · Video text remover · AI caption remover