MANIFEST_ERROR in mediatailor ?

The MANIFEST_ERROR you're seeing in your MediaTailor CloudWatch logs indicates that MediaTailor is having trouble obtaining the template manifest from your origin server. This error occurs during MediaTailor's interaction with the origin server when requesting and receiving manifests.

Based on the log entry you shared, there are several potential causes for this issue:

1. The origin server might be returning a 400 Bad Request response (as indicated by the httpCode:400 in your log).

2. There could be an issue with the manifest format or compatibility with MediaTailor.

3. The origin URL might be incorrectly configured or inaccessible.

To troubleshoot this issue:

1. Verify that your MediaTailor configuration name in the URL matches exactly (case-sensitive).

2. Test the manifest URL directly against MediaTailor without CDN to see if you can access it:

curl -v "https://your-emt-endpoint.mediatailor.region.amazonaws.com/v1/master/[format]/config-name/master.mpd"

3. Check if the origin server is properly configured and accessible from MediaTailor.

4. Verify that the manifest format is compatible with MediaTailor. For DASH manifests (as indicated by the .mpd extension in your logs), ensure it meets MediaTailor's requirements.

5. Check for any syntax errors in your configuration that might result in a malformed URL.

If direct testing works but you still encounter issues through your normal playback path, check your CDN routing rules to ensure they're correctly forwarding requests to MediaTailor.
Sources
MediaTailor error codes and CDN integration troubleshooting - AWS Elemental MediaTailor
Troubleshoot CDN manifest 404 errors for MediaTailor - AWS Elemental MediaTailor
AWS Elemental MediaTailor manifest logs description and event types - AWS Elemental MediaTailor

It sounds like manifest compatibility issue. Best way to proceed here is to open ticket in AWS support.