Video Resolution Scaler
Draws browser-decoded frames directly to the requested canvas dimensions and records 30 fps WebM through MediaRecorder. Direct scaling can stretch the picture; there is no aspect-ratio, bitrate, or codec control.
About this video resolution scaler
Draws browser-decoded frames directly to the requested canvas dimensions and records 30 fps WebM through MediaRecorder. Direct scaling can stretch the picture; there is no aspect-ratio, bitrate, or codec control 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
Redraws decoded video frames to a canvas scaled to requested target width and height (rounded to even values), and re-encodes the stream to WebM via browser MediaRecorder API.
Worked media transformation example
Scenario: A web developer resizes a video to target dimensions for local preview.
Sample input:
Processing: Draws browser-decoded frames directly to a 1280x720 canvas (each requested dimension becomes an even integer with a minimum of 2), so it can stretch or upscale without letterboxing; captures at 30 fps, retains source audio only when captureStream exposes tracks, and uses the first supported VP9/Opus, VP8/Opus, or generic WebM MediaRecorder MIME type.
Illustrative output:
Buffer duration & codec support limits
The image is stretched to the target dimensions rather than aspect-fit; larger target dimensions are not rejected. WebM re-encoding, audio availability, output size, and exact fidelity depend on browser support.
Audio and video rendering in Video Resolution Scaler 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 Resolution Scaler 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:
Video Resolution Scaler verification · Audit standards
How to use it
- Select a browser-decodable video and set target width and height.
- Draw frames into an even-sized Canvas at the requested dimensions and capture its stream at 30 fps with available source audio.
- Record and download a new WebM video.
Frequently asked questions
How does Video Resolution Scaler work in this implementation?+
It draws decoded frames directly to a requested-width and requested-height canvas, rounds each canvas dimension to an even integer with a minimum of 2 pixels, captures it at 30 fps, conditionally adds source audio tracks, and records WebM with the first supported VP9, VP8, or default MediaRecorder MIME type.
Which controls does Video Resolution Scaler actually provide?+
The visible controls are one video-file picker, Width, Height, and Process locally. Width and height show a 1–4096 UI range, then the render path applies only the even-number/minimum-2 canvas rule. There is no aspect-ratio, crop, letterbox, bitrate, codec, frame-rate, or audio control.
Which input and output limits apply to Video Resolution Scaler?+
Direct scaling can stretch a picture when target and source aspect ratios differ. Output is WebM, not the original container, and depends on browser decoding and MediaRecorder support. File size, bitrate, exact codec, duration fidelity, and every input format are not guaranteed.
Is the selected video submitted when using Video Resolution Scaler?+
Choose a browser-decodable video and set output width and height. The tool draws frames into that canvas size and re-encodes WebM; dimensions are applied independently, so a different aspect ratio can stretch the image. Codec, bitrate, duration fidelity and original metadata are not guaranteed.