Video crop rectangle and ratio presets
Select a video crop rectangle, lock common ratios, preview the result and export a local WebM for clips shorter than three minutes.
About this video crop rectangle and ratio presets
Select a video crop rectangle, lock common ratios, preview the result and export a local WebM for clips shorter than three minutes Processes streaming audio and video buffers directly in the browser using HTML5 Media and Web Audio APIs with zero server uploads.
Audio and video decoding pipeline
The execution engine processes input tokens and applies transformations in the browser sandbox. Specifically, The video stays on this device. A chosen x/y/width/height rectangle is drawn from decoded frames onto Canvas. Presets 1:1, 4:5, 16:9 and 9:16 retain exact integer ratios while moving or resizing. MediaRecorder records a 30 fps canvas stream and available source audio as WebM; it re-encodes the entire playback.
Worked media transformation example
Scenario: Video crop rectangle and ratio presets
Sample input:
Illustrative output:
Buffer duration & codec support limits
Operational constraints and validation boundaries: Input <500 MB (500,000,000 bytes) and duration strictly under 180 seconds. Source: at most 8192 pixels per edge and 16,777,216 pixels total. Crop width and height must be even integers from 2 to 4096, entirely inside the source. Ratio presets lock integer proportions. Export records the full playback in real time at a requested 30 fps; audio is included only when source capture exposes audio tracks. No MP4, stream copying, guaranteed hardware encoding, frame synchronization, HDR or original color fidelity.
Audio and video rendering in Video crop rectangle and ratio presets depends on browser hardware and supported media codecs. Verify playback compatibility on your target platforms.
In-memory audio-video processing boundary
File buffers and document assets in Video crop rectangle and ratio presets are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
HTML5 Media & Web Audio standards
W3C Web Audio API specifications and HTML5 media container standards:
- Canvas 2D source-rectangle drawImage and canvas.captureStream
- MediaRecorder WebM encoding; browser-dependent source audio capture
- Strict duration under180seconds; real-time re-encoding, no hardware/color/sync guarantee
Video crop rectangle and ratio presets verification · Audit standards
How to use it
- Load a local short video.
- Review parameter fields, units, or options configured for Video crop rectangle and ratio presets.
- Click the action button or observe immediate live calculations rendered by Video crop rectangle and ratio presets.
Frequently asked questions
Video crop rectangle and ratio presets+
The video stays on this device.
Export cropped WebM+
Load a local short video.
Locked aspect ratio+
Input <500 MB (500,000,000 bytes) and duration strictly under 180 seconds.
Download WebM+
Security isolation for "Download WebM" ensures zero transmission beyond your local workstation.