fix: fix audio issues

2025-03-26 06:55:37 +08:00
parent 39e17eb6a5
commit 8cc1a2bab1
25 changed files with 371 additions and 306 deletions
--- a/packages/matroska/src/codecs/index.ts
+++ b/packages/matroska/src/codecs/index.ts
@@ -16,16 +16,16 @@ import {
 import {
  genCodecStringByAV1DecoderConfigurationRecord,
  parseAV1DecoderConfigurationRecord,
-} from './av1.ts';
+} from './av1';
 import {
  genCodecStringByHEVCDecoderConfigurationRecord,
  parseHEVCDecoderConfigurationRecord,
-} from './hevc.ts';
+} from './hevc';
 import {
  genCodecStringByVP9DecoderConfigurationRecord,
  parseVP9DecoderConfigurationRecord,
  VP9_CODEC_TYPE,
-} from './vp9.ts';
+} from './vp9';

 export const VideoCodecId = {
  VCM: 'V_MS/VFW/FOURCC',
--- a/packages/matroska/src/model/index.ts
+++ b/packages/matroska/src/model/index.ts
@@ -1,4 +1,3 @@
-import type { CreateRangedStreamOptions } from '@konoplayer/core/data';
 import { type EbmlEBMLTagType, EbmlTagIdEnum, EbmlTagPosition } from 'konoebml';
 import {
  switchMap,
@@ -7,14 +6,14 @@ import {
  shareReplay,
  map,
  combineLatest,
-  of,
+  of, type Observable, delayWhen, pipe, finalize, tap, throwIfEmpty,
 } from 'rxjs';
 import { isTagIdPos } from '../util';
-import { createRangedEbmlStream } from './resource';
+import {createRangedEbmlStream, type CreateRangedEbmlStreamOptions} from './resource';
 import { type MatroskaSegmentModel, createMatroskaSegment } from './segment';

 export type CreateMatroskaOptions = Omit<
-  CreateRangedStreamOptions,
+  CreateRangedEbmlStreamOptions,
  'byteStart' | 'byteEnd'
 >;

@@ -25,7 +24,7 @@ export interface MatroskaModel {
  segment: MatroskaSegmentModel;
 }

-export function createMatroska(options: CreateMatroskaOptions) {
+export function createMatroska(options: CreateMatroskaOptions): Observable<MatroskaModel> {
  const metadataRequest$ = createRangedEbmlStream({
    ...options,
    byteStart: 0,
@@ -33,32 +32,34 @@ export function createMatroska(options: CreateMatroskaOptions) {

  return metadataRequest$.pipe(
    switchMap(({ totalSize, ebml$, response }) => {
-      const head$ = ebml$.pipe(
-        filter(isTagIdPos(EbmlTagIdEnum.EBML, EbmlTagPosition.End)),
-        take(1),
-        shareReplay(1)
-      );
-
-      const segmentStart$ = ebml$.pipe(
-        filter(isTagIdPos(EbmlTagIdEnum.Segment, EbmlTagPosition.Start))
-      );

      /**
       * while [matroska v4](https://www.matroska.org/technical/elements.html) doc tell that there is only one segment in a file
       * some mkv generated by strange tools will emit several
       */
-      const segments$ = segmentStart$.pipe(
-        map((startTag) =>
-          createMatroskaSegment({
-            startTag,
-            matroskaOptions: options,
-            ebml$,
-          })
-        )
+      const segment$ = ebml$.pipe(
+        filter(isTagIdPos(EbmlTagIdEnum.Segment, EbmlTagPosition.Start)),
+        map((startTag) => createMatroskaSegment({
+           startTag,
+           matroskaOptions: options,
+           ebml$,
+         })),
+        delayWhen(
+          ({ loadedMetadata$ }) => loadedMetadata$
+        ),
+        take(1),
+        shareReplay(1)
+      );
+
+      const head$ = ebml$.pipe(
+        filter(isTagIdPos(EbmlTagIdEnum.EBML, EbmlTagPosition.End)),
+        take(1),
+        shareReplay(1),
+        throwIfEmpty(() => new Error("failed to find head tag"))
      );

      return combineLatest({
-        segment: segments$.pipe(take(1)),
+        segment: segment$,
        head: head$,
        totalSize: of(totalSize),
        initResponse: of(response),
--- a/packages/matroska/src/model/resource.ts
+++ b/packages/matroska/src/model/resource.ts
@@ -3,14 +3,18 @@ import {
  createRangedStream,
 } from '@konoplayer/core/data';
 import { type EbmlTagType, EbmlStreamDecoder, EbmlTagIdEnum } from 'konoebml';
-import { Observable, from, switchMap, share, defer, EMPTY, of } from 'rxjs';
+import {Observable, from, switchMap, share, defer, EMPTY, of, tap} from 'rxjs';
 import { waitTick } from '../util';

+export interface CreateRangedEbmlStreamOptions extends CreateRangedStreamOptions {
+  refCount?: boolean
+}
+
 export function createRangedEbmlStream({
  url,
  byteStart = 0,
-  byteEnd,
-}: CreateRangedStreamOptions): Observable<{
+  byteEnd
+}: CreateRangedEbmlStreamOptions): Observable<{
  ebml$: Observable<EbmlTagType>;
  totalSize?: number;
  response: Response;
@@ -23,7 +27,10 @@ export function createRangedEbmlStream({
    switchMap(({ controller, body, totalSize, response }) => {
      let requestCompleted = false;

-      const originRequest$ = new Observable<EbmlTagType>((subscriber) => {
+      const ebml$ = new Observable<EbmlTagType>((subscriber) => {
+        if (requestCompleted) {
+          subscriber.complete();
+        }
        body
          .pipeThrough(
            new EbmlStreamDecoder({
@@ -57,8 +64,10 @@ export function createRangedEbmlStream({
          });

        return () => {
-          requestCompleted = true;
-          controller.abort();
+          if (!requestCompleted) {
+            requestCompleted = true;
+            controller.abort();
+          }
        };
      }).pipe(
        share({
@@ -68,22 +77,12 @@ export function createRangedEbmlStream({
        })
      );

-      const ebml$ = defer(() =>
-        requestCompleted ? EMPTY : originRequest$
-      ).pipe(
-        share({
-          resetOnError: false,
-          resetOnComplete: true,
-          resetOnRefCountZero: true,
-        })
-      );
-
      return of({
-        ebml$,
        totalSize,
        response,
        body,
        controller,
+        ebml$
      });
    })
  );
--- a/packages/matroska/src/model/segment.ts
+++ b/packages/matroska/src/model/segment.ts
@@ -12,7 +12,6 @@ import {
  takeWhile,
  share,
  map,
-  last,
  switchMap,
  shareReplay,
  EMPTY,
@@ -23,6 +22,8 @@ import {
  merge,
  isEmpty,
  finalize,
+  delayWhen,
+  from,
 } from 'rxjs';
 import type { CreateMatroskaOptions } from '.';
 import { type ClusterType, TrackTypeRestrictionEnum } from '../schema';
@@ -51,7 +52,6 @@ export interface CreateMatroskaSegmentOptions {
 export interface MatroskaSegmentModel {
  startTag: EbmlSegmentTagType;
  segment: SegmentSystem;
-  metadataTags$: Observable<EbmlTagType>;
  loadedMetadata$: Observable<SegmentSystem>;
  loadedTags$: Observable<SegmentSystem>;
  loadedCues$: Observable<SegmentSystem>;
@@ -59,19 +59,19 @@ export interface MatroskaSegmentModel {
  videoTrackDecoder: (
    track: VideoTrackContext,
    cluster$: Observable<ClusterType>
-  ) => {
+  ) => Observable<{
    track: VideoTrackContext;
    decoder: VideoDecoder;
    frame$: Observable<VideoFrame>;
-  };
+  }>;
  audioTrackDecoder: (
    track: AudioTrackContext,
    cluster$: Observable<ClusterType>
-  ) => {
+  ) => Observable<{
    track: AudioTrackContext;
    decoder: AudioDecoder;
    frame$: Observable<AudioData>;
-  };
+  }>;
  defaultVideoTrack$: Observable<VideoTrackContext | undefined>;
  defaultAudioTrack$: Observable<AudioTrackContext | undefined>;
 }
@@ -88,16 +88,20 @@ export function createMatroskaSegment({
  const metaScan$ = ebml$.pipe(
    scan(
      (acc, tag) => {
-        acc.segment.scanMeta(tag);
+        const segment = acc.segment;
+        segment.scanMeta(tag);
        acc.tag = tag;
+        acc.canComplete = segment.canCompleteMeta();
        return acc;
      },
      {
        segment,
        tag: undefined as unknown as EbmlTagType,
+        canComplete: false,
      }
    ),
-    takeWhile((acc) => acc.segment.canCompleteMeta(), true),
+    takeWhile(({ canComplete }) => !canComplete, true),
+    delayWhen(({ segment }) => from(segment.completeMeta())),
    share({
      resetOnComplete: false,
      resetOnError: false,
@@ -105,12 +109,11 @@ export function createMatroskaSegment({
    })
  );

-  const metadataTags$ = metaScan$.pipe(map(({ tag }) => tag));
-
  const loadedMetadata$ = metaScan$.pipe(
-    last(),
-    switchMap(({ segment }) => segment.completeMeta()),
-    shareReplay(1)
+    filter(({ canComplete }) => canComplete),
+    map(({ segment }) => segment),
+    take(1),
+    shareReplay(1),
  );

  const loadedRemoteCues$ = loadedMetadata$.pipe(
@@ -297,88 +300,94 @@ export function createMatroskaSegment({
    track: VideoTrackContext,
    cluster$: Observable<ClusterType>
  ) => {
-    const { decoder, frame$ } = createVideoDecodeStream(track.configuration);
+    return createVideoDecodeStream(track.configuration).pipe(
+      map(({ decoder, frame$ }) => {
+        const clusterSystem = segment.cluster;
+        const infoSystem = segment.info;
+        const timestampScale = Number(infoSystem.info.TimestampScale) / 1000;

-    const clusterSystem = segment.cluster;
+        const decodeSubscription = cluster$.subscribe((cluster) => {
+          for (const block of clusterSystem.enumerateBlocks(
+            cluster,
+            track.trackEntry
+          )) {
+            const blockTime = (Number(cluster.Timestamp) + block.relTime) * timestampScale;
+            const blockDuration =
+              frames.length > 1 ? track.predictBlockDuration(blockTime) * timestampScale : 0;
+            const perFrameDuration =
+              frames.length > 1 && blockDuration
+                ? blockDuration / block.frames.length
+                : 0;

-    const decodeSubscription = cluster$.subscribe((cluster) => {
-      for (const block of clusterSystem.enumerateBlocks(
-        cluster,
-        track.trackEntry
-      )) {
-        const blockTime = Number(cluster.Timestamp) + block.relTime;
-        const blockDuration =
-          frames.length > 1 ? track.predictBlockDuration(blockTime) : 0;
-        const perFrameDuration =
-          frames.length > 1 && blockDuration
-            ? blockDuration / block.frames.length
-            : 0;
+            for (const frame of block.frames) {
+              const chunk = new EncodedVideoChunk({
+                type: block.keyframe ? 'key' : 'delta',
+                data: frame,
+                timestamp: blockTime + perFrameDuration,
+              });

-        for (const frame of block.frames) {
-          const chunk = new EncodedVideoChunk({
-            type: block.keyframe ? 'key' : 'delta',
-            data: frame,
-            timestamp: blockTime + perFrameDuration,
-          });
+              decoder.decode(chunk);
+            }
+          }
+        });

-          decoder.decode(chunk);
+        return {
+          track,
+          decoder,
+          frame$: frame$
+            .pipe(
+              finalize(() => {
+                decodeSubscription.unsubscribe();
+              })
+            )
        }
-      }
-    });
-
-    return {
-      track,
-      decoder,
-      frame$: frame$
-        .pipe(
-          finalize(() => {
-            decodeSubscription.unsubscribe();
-          })
-        )
-        .pipe(share()),
-    };
+      })
+    );
  };

  const audioTrackDecoder = (
    track: AudioTrackContext,
    cluster$: Observable<ClusterType>
  ) => {
-    const { decoder, frame$ } = createAudioDecodeStream(track.configuration);
+    return createAudioDecodeStream(track.configuration).pipe(
+      map(({ decoder, frame$ }) => {
+        const clusterSystem = segment.cluster;
+        const infoSystem = segment.info;
+        const timestampScale = Number(infoSystem.info.TimestampScale) / 1000;

-    const clusterSystem = segment.cluster;
+        const decodeSubscription = cluster$.subscribe((cluster) => {
+          for (const block of clusterSystem.enumerateBlocks(
+            cluster,
+            track.trackEntry
+          )) {
+            const blockTime = (Number(cluster.Timestamp) + block.relTime) * timestampScale;
+            const blockDuration =
+              frames.length > 1 ? track.predictBlockDuration(blockTime) : 0;
+            const perFrameDuration =
+              frames.length > 1 && blockDuration
+                ? blockDuration / block.frames.length
+                : 0;

-    const decodeSubscription = cluster$.subscribe((cluster) => {
-      for (const block of clusterSystem.enumerateBlocks(
-        cluster,
-        track.trackEntry
-      )) {
-        const blockTime = Number(cluster.Timestamp) + block.relTime;
-        const blockDuration =
-          frames.length > 1 ? track.predictBlockDuration(blockTime) : 0;
-        const perFrameDuration =
-          frames.length > 1 && blockDuration
-            ? blockDuration / block.frames.length
-            : 0;
+            let i = 0;
+            for (const frame of block.frames) {
+              const chunk = new EncodedAudioChunk({
+                type: block.keyframe ? 'key' : 'delta',
+                data: frame,
+                timestamp: blockTime + perFrameDuration * i,
+              });
+              i++;

-        let i = 0;
-        for (const frame of block.frames) {
-          const chunk = new EncodedAudioChunk({
-            type: block.keyframe ? 'key' : 'delta',
-            data: frame,
-            timestamp: blockTime + perFrameDuration * i,
-          });
-          i++;
+              decoder.decode(chunk);
+            }
+          }
+        });

-          decoder.decode(chunk);
-        }
-      }
-    });
-
-    return {
-      track,
-      decoder,
-      frame$: frame$.pipe(finalize(() => decodeSubscription.unsubscribe())),
-    };
+        return {
+          track,
+          decoder,
+          frame$: frame$.pipe(finalize(() => decodeSubscription.unsubscribe())),
+        };
+    }));
  };

  const defaultVideoTrack$ = loadedMetadata$.pipe(
@@ -406,7 +415,6 @@ export function createMatroskaSegment({
  return {
    startTag,
    segment,
-    metadataTags$,
    loadedMetadata$,
    loadedTags$,
    loadedCues$,
@@ -414,6 +422,6 @@ export function createMatroskaSegment({
    videoTrackDecoder,
    audioTrackDecoder,
    defaultVideoTrack$,
-    defaultAudioTrack$,
+    defaultAudioTrack$
  };
 }
--- a/packages/matroska/src/systems/cluster.ts
+++ b/packages/matroska/src/systems/cluster.ts
@@ -6,7 +6,8 @@ import {
  type BlockGroupType,
  type TrackEntryType,
 } from '../schema';
-import { type SegmentComponent, SegmentComponentSystemTrait } from './segment';
+import { type SegmentComponent } from './segment';
+import {SegmentComponentSystemTrait} from "./segment-component";

 export abstract class BlockViewTrait {
  abstract get keyframe(): boolean;
--- a/packages/matroska/src/systems/cue.ts
+++ b/packages/matroska/src/systems/cue.ts
@@ -1,7 +1,8 @@
 import {type EbmlCuePointTagType, type EbmlCuesTagType, EbmlTagIdEnum} from "konoebml";
-import {CuePointSchema, type CuePointType, type CueTrackPositionsType} from "../schema.ts";
+import {CuePointSchema, type CuePointType, type CueTrackPositionsType} from "../schema";
 import {maxBy} from "lodash-es";
-import {type SegmentComponent, SegmentComponentSystemTrait} from "./segment.ts";
+import type {SegmentComponent} from "./segment";
+import {SegmentComponentSystemTrait} from "./segment-component";

 export class CueSystem extends SegmentComponentSystemTrait<
  EbmlCuePointTagType,
--- a/packages/matroska/src/systems/index.ts
+++ b/packages/matroska/src/systems/index.ts
@@ -3,5 +3,6 @@ export { CueSystem } from './cue';
 export { TagSystem } from './tag';
 export { ClusterSystem } from './cluster';
 export { InfoSystem } from './info';
-export { type SegmentComponent, SegmentSystem, SegmentComponentSystemTrait, withSegment } from './segment';
-export { SeekSystem, SEEK_ID_KAX_CUES, SEEK_ID_KAX_INFO, SEEK_ID_KAX_TAGS, SEEK_ID_KAX_TRACKS } from './seek';
+export { type SegmentComponent, SegmentSystem, withSegment } from './segment';
+export { SeekSystem, SEEK_ID_KAX_CUES, SEEK_ID_KAX_INFO, SEEK_ID_KAX_TAGS, SEEK_ID_KAX_TRACKS } from './seek';
+export {SegmentComponentSystemTrait} from "./segment-component";
--- a/packages/matroska/src/systems/info.ts
+++ b/packages/matroska/src/systems/info.ts
@@ -1,6 +1,7 @@
 import type {EbmlInfoTagType} from "konoebml";
-import {InfoSchema, type InfoType} from "../schema.ts";
-import {type SegmentComponent, SegmentComponentSystemTrait} from "./segment.ts";
+import {InfoSchema, type InfoType} from "../schema";
+import type {SegmentComponent} from "./segment";
+import {SegmentComponentSystemTrait} from "./segment-component";

 export class InfoSystem extends SegmentComponentSystemTrait<
  EbmlInfoTagType,
--- a/packages/matroska/src/systems/seek.ts
+++ b/packages/matroska/src/systems/seek.ts
@@ -1,9 +1,8 @@
 import type {EbmlSeekHeadTagType, EbmlTagType} from "konoebml";
-import {SeekHeadSchema, type SeekHeadType} from "../schema.ts";
+import {SeekHeadSchema, type SeekHeadType} from "../schema";
 import {isEqual} from "lodash-es";
-import {UnreachableOrLogicError} from "@konoplayer/core/errors.ts";
-
-import {SegmentComponentSystemTrait} from "./segment.ts";
+import {UnreachableOrLogicError} from "@konoplayer/core/errors";
+import {SegmentComponentSystemTrait} from "./segment-component";

 export const SEEK_ID_KAX_INFO = new Uint8Array([0x15, 0x49, 0xa9, 0x66]);
 export const SEEK_ID_KAX_TRACKS = new Uint8Array([0x16, 0x54, 0xae, 0x6b]);
--- a/packages/matroska/src/systems/segment-component.ts
+++ b/packages/matroska/src/systems/segment-component.ts
@@ -0,0 +1,37 @@
+import type {EbmlMasterTagType} from "konoebml";
+import {ArkErrors, type Type} from "arktype";
+import {convertEbmlTagToComponent, type InferType} from "../util";
+import type {SegmentComponent, SegmentSystem} from "./segment";
+
+export class SegmentComponentSystemTrait<
+  E extends EbmlMasterTagType,
+  S extends Type<any>,
+> {
+  segment: SegmentSystem;
+
+  get schema(): S {
+    throw new Error('unimplemented!');
+  }
+
+  constructor(segment: SegmentSystem) {
+    this.segment = segment;
+  }
+
+  componentFromTag(tag: E): SegmentComponent<InferType<S>> {
+    const extracted = convertEbmlTagToComponent(tag);
+    const result = this.schema(extracted) as
+      | (InferType<S> & { segment: SegmentSystem })
+      | ArkErrors;
+    if (result instanceof ArkErrors) {
+      const errors = result;
+      console.error(
+        'Parse component from tag error:',
+        tag.toDebugRecord(),
+        errors.flatProblemsByPath
+      );
+      throw errors;
+    }
+    result.segment = this.segment;
+    return result;
+  }
+}
--- a/packages/matroska/src/systems/segment.ts
+++ b/packages/matroska/src/systems/segment.ts
@@ -1,20 +1,18 @@
 import {
  type EbmlClusterTagType,
-  type EbmlMasterTagType,
  type EbmlSegmentTagType,
  EbmlTagIdEnum,
  EbmlTagPosition,
  type EbmlTagType
 } from "konoebml";
-import {ArkErrors, type Type} from "arktype";
-import {convertEbmlTagToComponent, type InferType} from "../util.ts";
-import {CueSystem} from "./cue.ts";
-import {ClusterSystem} from "./cluster.ts";
-import {SEEK_ID_KAX_CUES, SEEK_ID_KAX_INFO, SEEK_ID_KAX_TAGS, SEEK_ID_KAX_TRACKS, SeekSystem} from "./seek.ts";
-import {InfoSystem} from "./info.ts";
-import {TrackSystem} from "./track.ts";
-import {TagSystem} from "./tag.ts";
-import type {BlockGroupType} from "../schema.ts";
+import {convertEbmlTagToComponent} from "../util";
+import {CueSystem} from "./cue";
+import {ClusterSystem} from "./cluster";
+import {SEEK_ID_KAX_CUES, SEEK_ID_KAX_INFO, SEEK_ID_KAX_TAGS, SEEK_ID_KAX_TRACKS, SeekSystem} from "./seek";
+import {InfoSystem} from "./info";
+import {TrackSystem} from "./track";
+import {TagSystem} from "./tag";
+import type {BlockGroupType} from "../schema";

 export class SegmentSystem {
  startTag: EbmlSegmentTagType;
@@ -70,7 +68,9 @@ export class SegmentSystem {
      this.seek.addSeekHeadTag(tag);
    }
    this.metaTags.push(tag);
-    this.seek.memoOffset(tag);
+    if (tag.position !== EbmlTagPosition.Start) {
+      this.seek.memoOffset(tag);
+    }
    if (tag.id === EbmlTagIdEnum.Cluster && !this.firstCluster) {
      this.firstCluster = tag;
      this.seekLocal();
@@ -97,7 +97,7 @@ export class SegmentSystem {
    if (lastTag.id === EbmlTagIdEnum.Segment && lastTag.position === EbmlTagPosition.End) {
      return true;
    }
-    return !!(this.firstCluster && this.track.preparedToConfigureTracks());
+    return (!!this.firstCluster && this.track.preparedToConfigureTracks());
  }

  async completeMeta() {
@@ -122,35 +122,3 @@ export function withSegment<T extends object>(
  return component_;
 }

-export class SegmentComponentSystemTrait<
-  E extends EbmlMasterTagType,
-  S extends Type<any>,
-> {
-  segment: SegmentSystem;
-
-  get schema(): S {
-    throw new Error('unimplemented!');
-  }
-
-  constructor(segment: SegmentSystem) {
-    this.segment = segment;
-  }
-
-  componentFromTag(tag: E): SegmentComponent<InferType<S>> {
-    const extracted = convertEbmlTagToComponent(tag);
-    const result = this.schema(extracted) as
-      | (InferType<S> & { segment: SegmentSystem })
-      | ArkErrors;
-    if (result instanceof ArkErrors) {
-      const errors = result;
-      console.error(
-        'Parse component from tag error:',
-        tag.toDebugRecord(),
-        errors.flatProblemsByPath
-      );
-      throw errors;
-    }
-    result.segment = this.segment;
-    return result;
-  }
-}
--- a/packages/matroska/src/systems/tag.ts
+++ b/packages/matroska/src/systems/tag.ts
@@ -1,7 +1,8 @@
 import {EbmlTagIdEnum, type EbmlTagsTagType, type EbmlTagTagType} from "konoebml";
-import {TagSchema, type TagType} from "../schema.ts";
+import {TagSchema, type TagType} from "../schema";

-import {type SegmentComponent, SegmentComponentSystemTrait} from "./segment.ts";
+import type {SegmentComponent} from "./segment";
+import {SegmentComponentSystemTrait} from "./segment-component";

 export class TagSystem extends SegmentComponentSystemTrait<
  EbmlTagTagType,
--- a/packages/matroska/src/systems/track.ts
+++ b/packages/matroska/src/systems/track.ts
@@ -1,7 +1,7 @@
 import {
  ParseCodecErrors,
  UnsupportedCodecError,
-} from '@konoplayer/core/errors.ts';
+} from '@konoplayer/core/errors';
 import {
  EbmlTagIdEnum,
  type EbmlTrackEntryTagType,
@@ -19,7 +19,9 @@ import {
  type TrackEntryType,
  TrackTypeRestrictionEnum,
 } from '../schema';
-import { type SegmentComponent, SegmentComponentSystemTrait } from './segment';
+import type { SegmentComponent } from './segment';
+import {SegmentComponentSystemTrait} from "./segment-component";
+import {pick} from "lodash-es";

 export interface GetTrackEntryOptions {
  priority?: (v: SegmentComponent<TrackEntryType>) => number;
@@ -29,13 +31,13 @@ export interface GetTrackEntryOptions {
 export abstract class TrackContext {
  peekingKeyframe?: Uint8Array;
  trackEntry: TrackEntryType;
-  timecodeScale: number;
+  timestampScale: number;
  lastBlockTimestamp = Number.NaN;
  averageBlockDuration = Number.NaN;

-  constructor(trackEntry: TrackEntryType, timecodeScale: number) {
+  constructor(trackEntry: TrackEntryType, timestampScale: number) {
    this.trackEntry = trackEntry;
-    this.timecodeScale = timecodeScale;
+    this.timestampScale = Number(timestampScale);
  }

  peekKeyframe(payload: Uint8Array) {
@@ -87,7 +89,8 @@ export class VideoTrackContext extends TrackContext {
      this.trackEntry,
      this.peekingKeyframe
    );
-    if (await VideoDecoder.isConfigSupported(configuration)) {
+    const checkResult = await VideoDecoder?.isConfigSupported?.(configuration);
+    if (!checkResult?.supported) {
      throw new UnsupportedCodecError(configuration.codec, 'video decoder');
    }
    this.configuration = configuration;
@@ -106,7 +109,8 @@ export class AudioTrackContext extends TrackContext {
      this.trackEntry,
      this.peekingKeyframe
    );
-    if (await AudioDecoder.isConfigSupported(configuration)) {
+    const checkResult = await AudioDecoder?.isConfigSupported?.(configuration);
+    if (!checkResult?.supported) {
      throw new UnsupportedCodecError(configuration.codec, 'audio decoder');
    }

@@ -121,8 +125,7 @@ export class AudioTrackContext extends TrackContext {
      return (
        Number(
          this.configuration.samplesPerFrame / this.configuration.sampleRate
-        ) *
-        (1_000_000_000 / Number(this.timecodeScale))
+        ) * this.timestampScale
      );
    }
    const delta = blockTimestamp - this.lastBlockTimestamp;
@@ -203,7 +206,7 @@ export class TrackSystem extends SegmentComponentSystemTrait<
      }
    }
    if (parseErrors.cause.length > 0) {
-      console.error(parseErrors);
+      console.error(parseErrors, parseErrors.cause);
    }
  }