Export with quality of 1 fails

[MAKIO135]

When setting quality to 1, WebMWriter fails to export video since there is no space after VP8 in the generated binary.

webm-writer-js/src/WebMWriter.js

Line 77 in 7945d3c

keyframeStartIndex = webP.indexOf('VP8 ');

Workaround is to set quality to 0.99 but just wanted to let you know, maybe just to constrain quality to 0.99.

Except for this, the library works just fine, I'm using it to export canvas loops (https://observablehq.com/@makio135/bnb) thanks a lot 🙏

[thenickdude]

Thanks for the bug report, I've now fixed it so that quality = 1.0 gets clamped down to 0.99999 automatically. (Quality 1.0 was generating VP8L lossless frames, which don't appear to be supported in WebM)