A 404 on a YouTube HLS workflow does not identify the cause by itself. First find which request returned it: an encoder uploading HLS to YouTube, a player or CDN requesting a MediaPackage playback manifest or segment, or an AWS ingest request. These use different URLs and protocols. A YouTube HLS upload URL is not a MediaPackage playback URL.
Identify the request that returned 404
Capture the request before changing settings. A CDN or proxy can return its own 404, so the status alone does not prove that YouTube or MediaPackage generated it.
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- Record the full hostname, path, query parameter names, HTTP method, timestamp, response body, and response headers, including any CDN or proxy headers.
- Redact stream keys, authorization headers, signed query values, and account identifiers before sharing logs.
- Use the encoder log for upload failures, a browser or player network trace for playback failures, and CDN access logs when a CDN is involved.
- If a CDN is in the path, compare its response with a direct-origin request where the workflow permits it, and inspect cache behavior.
Determine the direction of the failed request
YouTube HLS ingest
The encoder sends HLS playlists and segments to the HTTPS ingestion address created for the stream in YouTube Live Control Room. Use the HLS URL and stream key shown for that stream. Do not substitute a MediaPackage egress or playback URL. YouTube describes HLS ingestion as an option for HDR or codecs not supported by RTMP in its HLS setup guidance.
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A viewer, player, or CDN requests a MediaPackage endpoint’s HLS manifest or one of its child playlists or media segments. Verify the endpoint and generated manifest URL in AWS; this is a delivery request, not an upload to YouTube.
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AWS ingest into MediaPackage
An upstream encoder or service sends content into MediaPackage using the ingest setup for the particular MediaPackage generation. MediaPackage v2 supports HLS or CMAF live inputs; v1 has different input requirements. In particular, AWS documents v1 HLS input as WebDAV with digest authentication and unencrypted media segments. Do not apply v1 endpoint assumptions to v2.
If a MediaPackage playback request returns 404
- Check forced endpoint-error behavior. In the endpoint configuration, inspect Force endpoint error configuration. MediaPackage v2 can be configured to return 404 for stale or incomplete manifests, missing DRM keys, or slate input. These responses can serve as health signals for an origin-failover workflow while problematic segments leave the exposed DVR window. Correlate the 404 time with input interruptions, timeline gaps, key rotation, or slate detection. Do not disable the behavior without understanding the failover design. See AWS’s MediaPackage v2 origin endpoint configuration.
- Compare manifest filters with the request query. AWS documents a 404 when an endpoint has a manifest filter and the request includes a matching query parameter. In a controlled test, use the correct filter syntax and remove redundant or matching query parameters. See AWS manifest filtering guidance.
- Copy the generated manifest URL instead of guessing its path. Check the current endpoint details or API output for the configured manifest name and URL. AWS uses
indexas the default manifest name only when no name is configured. An endpoint recreation, renamed manifest, or old copied URL can leave a client requesting an obsolete path. See AWS endpoint setup. - Find the first failing resource. Request the top-level HLS manifest, then follow its child playlists and segment URIs. Note the exact path that first returns 404. A missing segment and a missing top-level manifest are different failure points; the status alone does not tell you why either failed.
- Verify upstream media is arriving and supported. Check that the encoder is still sending data and that the input, container, tracks, codecs, and output endpoint type match the chosen MediaPackage generation. AWS support varies by version and endpoint type; AV1 support is limited to CMAF endpoint types. See the MediaPackage supported inputs and outputs reference.
- Isolate the CDN or proxy. Compare the origin and edge responses, then review cache behavior. A CDN response can obscure an origin result; do not assume a specific CDN setting is responsible without evidence.
If a YouTube HLS upload request returns 404
- Refresh the destination from Live Control Room. Confirm that the encoder uses the current YouTube HLS URL and HLS protocol stream key, not an RTMP destination or a MediaPackage playback endpoint. If the stream setup or key was replaced, update the encoder’s destination.
- Check the upload requests. YouTube’s HLS ingestion specification describes HTTP PUT or POST uploads and the expected HLS media playlist model. Confirm the encoder is sending playlist and segment files to the displayed upload URL.
- Validate the HLS format against YouTube’s current specification. Check HTTPS transport, playlist type, single-stream and muxed audio/video expectations, supported media and codecs, sequence behavior, and filename rules. Do not assume that a playlist accepted by another HLS origin meets YouTube’s ingest requirements.
- Protect the stream key. Check for a stale destination or replaced key, but redact the key from logs, tickets, and public troubleshooting posts.
Confirm which AWS MediaPackage generation and ingest mode you use
Before changing encoder settings, identify whether the workflow uses MediaPackage v1 or v2 and whether the AWS leg is HLS or CMAF. Their input and endpoint requirements differ. AWS documents v2 HLS/CMAF live inputs and endpoint-specific output support in its supported formats reference. For a MediaLive-to-MediaPackage v2 workflow, AWS recommends its MediaPackage output group configured for CMAF Ingest for new workflows; that recommendation applies to the AWS ingest leg, not to the destination URL used to upload to YouTube. See the MediaLive MediaPackage output group documentation.
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Escalate with a useful evidence bundle
If the cause remains unclear, include enough redacted information to distinguish a missing resource from a configuration or routing issue:
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- MediaPackage generation (v1 or v2), AWS region, and channel or endpoint identifiers with secrets removed.
- The failing host and path, with sensitive query values redacted; request method and timestamp.
- Status, response body, response headers, and any CDN or proxy details.
- Encoder output configuration and source/output media characteristics.
- Whether the request bypasses a CDN or proxy, if that test is available.
Without the failing request and its response, there is no single root cause that can be assigned to a “MediaPackage 404” report.
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