From cae71ed49c56e9f0626ae17a2bae6f94fcec2a14 Mon Sep 17 00:00:00 2001
From: FabLrc <fabien.laurence33@gmail.com>
Date: Tue, 28 Apr 2026 14:08:01 +0200
Subject: [PATCH] fix(exporter): add codec normalization for bare avc1/h264 and
 logging

---
 src/lib/exporter/streamingDecoder.ts | 36 ++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/src/lib/exporter/streamingDecoder.ts b/src/lib/exporter/streamingDecoder.ts
index c3bca3c..8cf0257 100644
--- a/src/lib/exporter/streamingDecoder.ts
+++ b/src/lib/exporter/streamingDecoder.ts
@@ -302,9 +302,12 @@ export class StreamingVideoDecoder {
 
 		const decoderConfig = await this.demuxer.getDecoderConfig("video");
 
-		// web-demuxer may return a bare "av01" for AV1 in WebM containers when the
-		// extradata isn't in the expected ISOBMFF format. WebCodecs requires the
-		// full parametrized form (e.g. "av01.0.05M.08").
+		console.log("[StreamingVideoDecoder] decoderConfig.codec:", decoderConfig.codec);
+		console.log("[StreamingVideoDecoder] decoderConfig.description:", decoderConfig.description);
+
+		// web-demuxer may return bare four-character code strings ("av01", "vp08",
+		// "vp09", "avc1") that WebCodecs rejects. Normalize them to the short or
+		// full parametrized forms that VideoDecoder accepts.
 		if (/^av01$/i.test(decoderConfig.codec)) {
 			decoderConfig.codec = buildAV1CodecString(
 				decoderConfig.description as BufferSource | undefined,
@@ -318,9 +321,19 @@ export class StreamingVideoDecoder {
 			decoderConfig.codec = "vp9";
 		}
 
+		if (/^avc1$/i.test(decoderConfig.codec)) {
+			decoderConfig.codec = "avc1.640033";
+		}
+		if (/^h264$/i.test(decoderConfig.codec)) {
+			decoderConfig.codec = "avc1.640033";
+		}
+
 		const codec = decoderConfig.codec.toLowerCase();
 		const shouldPreferSoftwareDecode =
-			codec.includes("av01") || codec.includes("av1") || codec.includes("vp09");
+			codec.includes("av01") ||
+			codec.includes("av1") ||
+			codec.includes("vp09") ||
+			codec.includes("vp9");
 		const segments = this.splitBySpeed(
 			this.computeSegments(this.metadata.duration, trimRegions),
 			speedRegions,
@@ -351,6 +364,10 @@ export class StreamingVideoDecoder {
 				}
 			},
 			error: (e: DOMException) => {
+				console.warn(
+					`[StreamingVideoDecoder] decoder error for codec "${decoderConfig.codec}":`,
+					e.message,
+				);
 				decodeError = new Error(`VideoDecoder error: ${e.message}`);
 				if (frameResolve) {
 					const resolve = frameResolve;
@@ -367,6 +384,17 @@ export class StreamingVideoDecoder {
 			: decoderConfig;
 
 		try {
+			const support = await VideoDecoder.isConfigSupported(preferredDecoderConfig);
+			console.log(
+				`[StreamingVideoDecoder] isConfigSupported for "${preferredDecoderConfig.codec}":`,
+				support.supported,
+			);
+			if (!support.supported) {
+				throw new DOMException(
+					`Unsupported codec: ${preferredDecoderConfig.codec}`,
+					"NotSupportedError",
+				);
+			}
 			this.decoder.configure(preferredDecoderConfig);
 		} catch (error) {
 			if (!shouldPreferSoftwareDecode) {