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RenditionFormatUnsupported error for large .mov files in AEM as a Cloud Service

Last update: October 30, 2026

Adobe Experience Manager as a Cloud Service (AEMaaCS) may fail to process large .mov files when they exceed the supported size for thumbnail extraction and rendition generation, resulting in a RenditionFormatUnsupported error. To resolve the issue, verify the supported file size limits, test with a smaller file, and pre-process or transcode large videos when required.

Description description

Environment

Adobe Experience Manager as a Cloud Service (AEMaaCS), all versions

Issue/Symptoms

  • Uploading a large .mov video file, approximately 17GB or larger, results in asset processing failure and no renditions are generated.
  • The logs contain the following message: Asset Compute worker failed to generate rendition for asset … Reason: RenditionFormatUnsupported, Message: Input video file is too large for thumbnail extraction
  • Asset metadata shows dam:assetState=processes and dam:runDMProcess=true.
  • The metadata property dam:scene7FileStatus=Not Supported is present.
  • The issue is reproducible with large .mov files of approximately 17GB or larger.
  • No other errors are present in the logs.

Root cause

Asset processing fails because the uploaded .mov file exceeds the maximum supported size for thumbnail extraction and rendition generation in AEM as a Cloud Service. The system returns RenditionFormatUnsupported when the input video file is too large.

Resolution resolution

Follow the steps below to resolve the issue:

  1. Review the AEM Asset Compute Service documentation to confirm the supported file size limits for video processing and rendition generation.
  2. Upload a smaller .mov file, for example, under 2GB, and verify that rendition generation works as expected for supported file sizes.
  3. Check the asset metadata for properties such as dam:scene7FileStatus=Not Supported and dam:assetState=processes to confirm that the file format or size isn’t supported for processing.
  4. If processing large video files is required, consider pre-processing or transcoding the video to a smaller size or different format before uploading it to AEM.
  5. Alternatively, use external tools to generate thumbnails or renditions and upload them as separate assets.
  6. Periodically review Adobe Experience Manager release notes and documentation for changes to supported file size limits or video processing capabilities.
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