Step 1 / source
Add the source media
Source intake
Drop one media file here
Choose the video containing the moment you want to keep.
MP4, MOV, WEBM, MKV, AVI, M4V, MPEG, or MPG1 file / 50 MB
Checking publication status before file selection...
TEMPORARY MEDIA WORKSPACE / VIDEO TRIMMER
Video Trimmer
Keep one continuous section of a video by entering start and end times, then download a newly encoded MP4 with synchronized audio.
Request-scoped temporary processingAdd one supported file up to 50 MB. Long or unusually large-frame media may be rejected before processing.No account required
Local API readinessMedia service ready
One bounded job runs per API worker by default.The processor required by this tool is available, and this worker can accept a temporary job.
1 file / 50 MB
Temporary server workspace
The selected bytes are sent only to the Nirmion media API for this request. Processing uses a private temporary workspace rather than permanent catalogue storage.
Request-scoped cleanup
Server-side source and result files are removed when the response stream closes. Re-downloads use the result Blob retained only in this browser tab.
Original stays unchanged
Nirmion writes a separately named result containing nirmion_tools and never overwrites the selected source file.
Know the product contract
What goes in, what changes, what comes back
Every media page documents the accepted source, the selected FFmpeg transformation, the output container, and the limits that can affect the job.
Prepare the source
Confirm the source duration and note the desired start and end points in seconds before uploading.
Apply one operation
FFmpeg seeks to the requested start, decodes the chosen interval, then encodes new H.264 video and available AAC audio for reliable boundaries.
Receive a separate file
Review the first and last seconds, audio sync, and total duration in the downloaded MP4.
Plain-language method
How time-based video trimming works
Accurate re-encoding avoids keyframe-only cuts but introduces one lossy video encode. The result is intended as a working clip, not a lossless archival edit.
- 01Choose valid source media
Confirm the source duration and note the desired start and end points in seconds before uploading.
- 02Review the operation settings
The end must be later than the start and within the source. Decimal values such as 12.5 provide finer placement.
- 03Inspect and download the result
Review the first and last seconds, audio sync, and total duration in the downloaded MP4.
Useful when
Practical jobs this tool handles
- Remove setup time from a screen recording.
- Keep one answer from a longer interview.
- Prepare a concise evidence or demonstration clip.
Before processing
Check the source and output choices first
- Measure times from 00:00, not from a media player bookmark.
- Keep the end later than the start.
- Check that the selected interval includes complete speech.
- Review the exported first and last frame.
Container and codec
Understand the output format
Output is MP4 with H.264 video and AAC audio when present. Chapters, subtitles, attachments, and extra tracks are not carried forward.
Know the boundary
This keeps one continuous interval
The tool does not remove several separate middle sections or join non-adjacent moments. Trim multiple clips first, then use Video Merger when that workflow is needed.
Quick answers
Questions before you process media
These answers describe the actual upload, FFmpeg processing, download, and temporary-retention contract.
Can I leave the end time empty?
Yes. The clip then runs from the start time to the source end.
Are decimal seconds supported?
Yes. The API accepts bounded decimal values for more precise cuts.
Why is the output re-encoded?
Re-encoding gives dependable requested boundaries across different source codecs and keyframes.