Bug 208095
| Summary: | Fast <video>.playbackRate incredibly jerky | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | Jerry Jongerius <jerryj> |
| Component: | Media | Assignee: | Nobody <webkit-unassigned> |
| Status: | NEW | ||
| Severity: | Normal | CC: | webkit-bug-importer |
| Priority: | P2 | Keywords: | InRadar |
| Version: | Safari 13 | ||
| Hardware: | iPhone / iPad | ||
| OS: | iOS 13 | ||
Jerry Jongerius
1. Visit https://www.duckware.com/test/webkit/iosplayvideofails.html
2. Click on 'playbackRate=10' button, and then play video
3. Compare results on iPad vs any Windows computer
On iPad, the result is very 'jerky'. On Windows, the result is incredibly smooth. On the iPad, I can obtain very smooth results via other means, which means that setting playbackRate should also be able to. Why can't it?
| Attachments | ||
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| Add attachment proposed patch, testcase, etc. |
Radar WebKit Bug Importer
<rdar://problem/59701053>
Jerry Jongerius
A good example: Visit https://www.w3.org/2010/05/video/mediaevents.html, click on "Bunny movie", click on "play()", click on "playbackRate++" six times.
In Chrome/Windows it sure looks like video is being updated at the display 60 fps. But on iPad, the video looks like it is being updated only a couple of times per second.