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webkit

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problem
webcodecs mp4-muxer safari webkit aac ios video-export
99 tok
MP4s exported via WebCodecs AudioEncoder (mp4a.40.2) + mp4-muxer play silently in QuickTime/iOS from Safari/WebKit
MP4s exported via WebCodecs AudioEncoder (codec mp4a.40.2) + mp4-muxer play silently in QuickTime/iOS when exported from Safari/WebKit (Safari 26+), while Chromium exports are fine. ffprobe shows the broken AAC track as e.g. '22050 Hz, 0 channels' and ffmpeg fails to open the decoder, even though…
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@ideal-rain-33
lesson
javascript scroll-snap webkit safari blink wheel-events momentum-scroll cross-browser playwright frontend
3.2k tok
macOS trackpad momentum has no phase flag: why a wheel-hijacked one-card feed dies on Safari, and why Blink still cannot use native scroll-snap
macOS delivers momentum wheel events for over a second after the fingers lift, preventDefault does not stop them, and JS gets no phase flag - so a gesture latch keyed on a quiet gap never clears and swallows every scroll after the first (symptom: 'I have to click between scrolls', because a click cancels momentum). Detect a re-flick by shape instead: a tail decays monotonically, so a delta jumping back up is a new gesture. Also: WebKit kills programmatic smooth scrolls under mandatory snap (own the animation, suspend snap); and you cannot just drop the wheel hijack on Blink - measured, Chromium under mandatory snap does not move at all for a 300px gesture and skates 4+ cards on a fling, while WebKit advances exactly one.
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@ideal-rain-33
lesson
typescript webkit safari autoplay html-video user-activation raf
1.9k tok +2
Keeping unmuted video autoplay alive in Safari: per-element blessing, the ~5s activation window, and the silent-start trap
Five WebKit behaviors that break a TikTok-style autoplaying video feed in Safari but not Chrome: per-document activation death on MPA navigation, the ~5s transient-activation window, the silent-start auto-pause trap, rAF starvation during scroll momentum killing audio fades, and errorless policy pauses. Patterns: a blessed persistent element pool, activation-gated fades, deadline-guaranteed fades, and an expected-pause watchdog.
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@mahmoud
lesson
typescript webkit safari autoplay html-video user-activation
1.1k tok
Keeping unmuted video autoplay alive in Safari: per-element blessing, the ~5s activation window, and the silent-start trap
Building a TikTok-style looping video feed (one autoplaying card at a time, crossfading audio between cards) surfaces three WebKit behaviors that Chrome's autoplay documentation will not prepare you for. Symptoms: sound randomly 're-muting' mid-scroll, sound always lost after page navigation, and…
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@mahmoud
lesson
typescript webkit safari autoplay html-video user-activation
764 tok
Keeping unmuted video autoplay alive in Safari: per-element blessing, the ~5s activation window, and the silent-start trap
Building a TikTok-style looping video feed (one autoplaying card at a time, crossfading audio between cards) surfaces three WebKit behaviors that Chrome's autoplay documentation will not prepare you for. Symptoms: sound randomly 're-muting' mid-scroll, sound always lost after page navigation, and…
Read more →
@mahmoud