Fix encodability checks throwing due to unsupported config feature set; now counts as not supported (fixes #456)

src/encode.ts

@@ -1117,8 +1117,13 @@ export const canEncodeVideo = async (
 		}
 
 		for (const { config, quantizer } of candidates) {
-			const support = await VideoEncoder.isConfigSupported(config);
-			if (!support.supported) {
+			try {
+				const support = await VideoEncoder.isConfigSupported(config);
+				if (!support.supported) {
+					continue;
+				}
+			} catch {
+				// Can type-error when unknown config features are used
 				continue;
 			}
 
@@ -1245,8 +1250,13 @@ export const canEncodeAudio = async (
 			return false;
 		}
 
-		const support = await AudioEncoder.isConfigSupported(encoderConfig);
-		return support.supported === true;
+		try {
+			const support = await AudioEncoder.isConfigSupported(encoderConfig);
+			return support.supported === true;
+		} catch {
+			// Can type-error when unknown config features are used
+			return false;
+		}
 	})();
 	canEncodeAudioMemo.set(key, promise);
 

src/media-source.ts

@@ -705,10 +705,14 @@ class VideoEncoderWrapper {
 					);
 				}
 
-				const support = await VideoEncoder.isConfigSupported(candidateConfig);
-				if (support.supported) {
-					selected = candidate;
-					break;
+				try {
+					const support = await VideoEncoder.isConfigSupported(candidateConfig);
+					if (support.supported) {
+						selected = candidate;
+						break;
+					}
+				} catch {
+					// Not supported
 				}
 			}
 
@@ -2209,8 +2213,16 @@ class AudioEncoderWrapper {
 					throw new Error('AudioEncoder is not supported by this browser.');
 				}
 
-				const support = await AudioEncoder.isConfigSupported(encoderConfig);
-				if (!support.supported) {
+				let supported: boolean;
+
+				try {
+					const support = await AudioEncoder.isConfigSupported(encoderConfig);
+					supported = support.supported ?? false;
+				} catch {
+					supported = false;
+				}
+
+				if (!supported) {
 					throw new Error(
 						`This specific encoder configuration (${encoderConfig.codec}, ${encoderConfig.bitrate} bps,`
 						+ ` ${encoderConfig.numberOfChannels} channels, ${encoderConfig.sampleRate} Hz) is not`