Screen caps are lossy and obvious
Recording playback reintroduces frame drops, watermarking, and Terms violations. Position it as a last resort for accessibility research, not wholesale piracy.
Some platforms forbid even that
Enterprise streams and pay-per-view events may ban recording in contracts regardless of technical feasibility.
See also: Android system download UI: Fair use high-level framing · Chrome OS deployment tips: robots.txt for static hosts · DRM Basics for Anyone Building Video Tools
Why some tools cap concurrent tabs
Browser memory spikes when users queue ten 4K jobs. Gentle concurrency caps with messaging protect low-RAM devices from tab crashes.
Power users can open multiple browsers, but defaults should be safe.
Explaining aspect ratio letterboxing
Downloads may include black bars if the source was already pillarboxed. Offer a crop tool only if licensing and ethics allow, and warn about cutting subtitles.
Many viewers prefer original framing for archival honesty.
Elsewhere on this site
Browse the main YouTube video downloader, blog hub, guides page 2, deep links on the homepage (Technical SEO checklist, Core Web Vitals, How to download, Trust and legal), and crawl files sitemap.xml / robots.txt.
Try the downloader
When your workflow respects rights holders and platform rules, you can use our free YouTube video downloader interface as a front end to your own processing pipeline.