# Stream Passthrough Trimmer

Stream-copy trimming.

> Canonical page: https://elysiatools.com/en/tools/stream-passthrough-trimmer

- **Category:** Media

- **Keywords:** trim, stream copy, ffmpeg

## Overview

Cuts media without re-encoding. Great for fast rough cuts; exact frame cuts require transcoding.

## Inputs

- **Media File** (file)
- **Start Time (seconds)** (number)
- **Duration (seconds)** (number)

## When to use

- When you need to quickly extract a segment from a large video or audio file without waiting for a lengthy re-encoding process.
- When you want to preserve the exact original quality, codecs, and metadata of your media file during a trim.
- When performing rough cuts where frame-accurate precision is less critical than speed and quality preservation.

## How it works

- Upload your media file (video or audio) up to the supported file size limit.
- Specify the start time in seconds where you want the cut to begin.
- Enter the desired duration in seconds for the output clip.
- Run the tool to perform a stream-copy trim and download the processed media file instantly.

## Use cases

- Extracting a 30-second highlight clip from a long webinar recording.
- Trimming silence or unwanted intro segments from an audio podcast file.
- Splitting a large video file into smaller, manageable chunks without losing quality.

## Frequently asked questions

### Does this tool re-encode my video or audio?

No, it uses stream-copy (passthrough) technology to cut the media without re-encoding, preserving original quality.

### Why is the start of my trimmed video slightly off?

Stream-copy trimming cuts at the nearest keyframe. For exact frame-accurate cuts, transcoding is required.

### What file formats are supported?

The tool supports standard audio and video files, processing them using stream-copy operations.

### Is there a file size limit for uploads?

Yes, the maximum supported file size for upload is 100 MB.

### Can I specify the end time instead of duration?

No, you must specify the start time and the duration in seconds to define the cut segment.

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## Related content

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