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Replace MediaRecorder video export with WebCodecs + custom WebM muxer

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MediaRecorder/captureStream kept crashing the Chrome renderer
(STATUS_BREAKPOINT). Video is now encoded offline with VideoEncoder
(VP9 with VP8 fallback) and muxed by a dependency-free EBML/Matroska
writer. Adds precise export controls: video fps (24/30/60), exact
length (1-8 loops or 5-60s), and a GIF loop-forever/play-once toggle.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Leonxlnx
2026-06-10 00:59:06 +02:00
parent b0a040fcd0
commit e8c151f089
6 changed files with 266 additions and 88 deletions
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js/gifenc.js
+6 -4
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@@ -186,10 +186,12 @@ var GIFEnc = (function () {
out.byte(col[0]); out.byte(col[1]); out.byte(col[2]);
}
/* NETSCAPE loop forever */
out.byte(0x21); out.byte(0xFF); out.byte(11);
out.string("NETSCAPE2.0");
out.byte(3); out.byte(1); out.short(0); out.byte(0);
/* NETSCAPE loop extension: 0 = forever. Omitted entirely -> play once. */
if (opts.loop !== false) {
out.byte(0x21); out.byte(0xFF); out.byte(11);
out.string("NETSCAPE2.0");
out.byte(3); out.byte(1); out.short(0); out.byte(0);
}
var delay = Math.max(2, Math.round(100 / fps));
var indices = new Uint8Array(w * h);