Cause (Documented platform behavior): Only some Bedrock models accept video blocks; Converse validates the block type per model and rejects it with this message.
Fix status: documented_behavior
Limitations:
- Model capability list not enumerated here; check the Bedrock supported-features table.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/pydantic/pydantic-ai/69eb81bde23c8db52ee8617217bdaf46bf0468df/tests/models/cassettes/test_multimodal_tool_returns/test_multimodal_tool_return_matrix%5Bdirect-binary-video-bedrock_claude%5D.yaml (github_issue, unknown, reported_symptom): Recorded Bedrock 400 'This model doesn't support the video content block that you provided. Update the content block and try again.' for Claude with a binary video, and identically for URL/S3 video and video inside tool returns.
- https://raw.githubusercontent.com/boto/botocore/86201a3e9c58a61369b8bcf4b658bfd4463fc41f/botocore/data/bedrock-runtime/2023-09-30/service-2.json (official_docs, unknown, documented_behavior): VideoSource documentation: inline base64 video must be under 25MB encoded; up to 1GB from S3.
Search phrasings: bedrock claude video content block not supported; bedrock converse video tool result claude 400
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Requests that include a video (inline bytes, S3 location or downloaded URL), including video returned from a tool, fail for Claude models on Bedrock.
- Context
- Product: Amazon Bedrock Component: Converse ContentBlock.video / ToolResultContentBlock.video Operation: converse with a video block to an Anthropic Claude model Affected versions: unknown Environment: Amazon Bedrock Runtime (AWS SDK / boto3 / AnthropicBedrock clients) HTTP status: 400 Exception: ValidationException Trigger: Passing a video content block to a model without video input support (e.g. Claude on Bedrock).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- This model doesn't support the video content block that you provided. Update the content block and try again.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Amazon Bedrock Converse + Claude] 400 'This model doesn't support the video content block that you provided.' — video blocks (direct or in tool results) are Nova/Pegasus-only
Recommended action: Gate video input by model capability; for Claude, extract frames as images or send a transcript; use a video-capable model (e.g. Amazon Nova) when video is needed. Note VideoSource base64 must be under 25 MB (S3 up to 1 GB).
Option: Route video only to video-capable models [evidence: documented_workaround]
Steps:
1. Check model capabilities before attaching video.
2. Convert video to frames/transcript for Claude.
Expected: No 400 from Converse.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 60d7ab66-ad68-4b45-a75c-44f2dfe2ee69
- Proposed action
- Recommended action: Gate video input by model capability; for Claude, extract frames as images or send a transcript; use a video-capable model (e.g. Amazon Nova) when video is needed. Note VideoSource base64 must be under 25 MB (S3 up to 1 GB). Option: Route video only to video-capable models [evidence: documented_workaround] Steps: 1. Check model capabilities before attaching video. 2. Convert video to frames/transcript for Claude. Expected: No 400 from Converse.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.