diff --git a/packages/media-parser/src/boxes/iso-base-media/process-box.ts b/packages/media-parser/src/boxes/iso-base-media/process-box.ts
index dcc97e5e890..f1ddd4ded38 100644
--- a/packages/media-parser/src/boxes/iso-base-media/process-box.ts
+++ b/packages/media-parser/src/boxes/iso-base-media/process-box.ts
@@ -777,9 +777,6 @@ export const parseIsoBaseMediaBoxes = async ({
 			initialBoxes = initialBoxes.filter((b) => b.type !== 'mdat-box');
 			initialBoxes.push(result.box);
 			iterator.allowDiscard();
-			if (result.box.status !== 'samples-processed') {
-				throw new Error('unexpected');
-			}
 
 			break;
 		} else {
diff --git a/packages/media-parser/src/emit-available-info.ts b/packages/media-parser/src/emit-available-info.ts
index 0c9002b9256..5197946fdb3 100644
--- a/packages/media-parser/src/emit-available-info.ts
+++ b/packages/media-parser/src/emit-available-info.ts
@@ -76,18 +76,6 @@ export const emitAvailableInfo = ({
 
 					emittedFields.durationInSeconds = true;
 				}
-
-				if (!emittedFields.slowDurationInSeconds) {
-					const durationInSeconds = getDuration(segments, state);
-					if (durationInSeconds !== null) {
-						callbacks.onSlowDurationInSeconds?.(durationInSeconds);
-						if (fieldsInReturnValue.slowDurationInSeconds) {
-							returnValue.slowDurationInSeconds = durationInSeconds;
-						}
-
-						emittedFields.slowDurationInSeconds = true;
-					}
-				}
 			}
 
 			continue;
@@ -101,6 +89,7 @@ export const emitAvailableInfo = ({
 				segments
 			) {
 				const slowDurationInSeconds =
+					getDuration(segments, state) ??
 					state.slowDurationAndFps.getSlowDurationInSeconds();
 				callbacks.onSlowDurationInSeconds?.(slowDurationInSeconds);
 				if (fieldsInReturnValue.slowDurationInSeconds) {