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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI Review profile: CHILL Plan: Team Run ID: 📥 CommitsReviewing files that changed from the base of the PR and between 21a2211 and 1ee2f67e86e30a6ea62a2f4ccea3ab4c252286a2. 📒 Files selected for processing (3)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 SummarySummary by CodeRabbit
WalkthroughTorchCodec decode failures from user-provided video bytes now surface as client errors. Approximate seeking errors include guidance to retry with exact seeking. Documentation also explains FFmpeg thread settings for different concurrency levels. ChangesTorchCodec decode error handling
TorchCodec thread settings documentation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to TorchCodec failures from invalid or unsupported video now return client errors instead of server errors, with a retry hint for approximate seeking. No current merge-blocking risk remains. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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TorchCodec raises RuntimeError when decoding user-supplied video bytes fails, which escapes the exception-handler registry's ValueError fallback and returns HTTP 500 with an ASGI traceback. The pynvvideocodec backend already converts its decode failures to ValueError (-> 400); do the same for the torchcodec branch of VideoBackend.load_bytes, chaining the original exception. The most common user-triggerable case is seek_mode="approximate" on a file whose container metadata overstates the decodable frame count (e.g. stream-copied cuts made with ffmpeg -c copy): frame sampling targets an index past the real end and torchcodec raises "Requested next frame while there are no more frames left to decode." When seek_mode is "approximate", the converted message tells the user to retry with "exact". Also extend the Video Decoding Backend docs with operational guidance: when num_ffmpeg_threads=0 (default) beats 1 and vice versa, with measured numbers (768 frames of 1080p H.264 on 16 cores: ~10 s at 0 vs ~49 s at 1), and the approximate-mode metadata caveat. Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Devon Krisman <git@krisman.dev>
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Rebased onto current main (988d9b6) to clear the Mergify conflict. Upstream added a |
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Purpose
TorchCodec raises
RuntimeErrorwhen decoding user-supplied video bytesfails. That exception type has no handler in the exception-handler registry
(
ValueError/VLLMErrormap to 400; rawRuntimeErrorfalls through to thesafety net), so the server returns HTTP 500 with an ASGI traceback for
what is a client-input problem.
The most common user-triggerable case:
seek_mode="approximate"on a filewhose container metadata overstates the decodable frame count — e.g. any
stream-copied cut (
ffmpeg -c copy). Frame sampling targets an index pastthe real end and torchcodec raises
Requested next frame while there are no more frames left to decode.Reproduced end-to-end on a Qwen3.8-27B-FP8server: request → 500.
This PR converts
RuntimeErrorfrom the torchcodec branch ofVideoBackend.load_bytestoValueError(chained withfrom exc), exactlymirroring the existing pattern in the
pynvvideocodecbackend(
raise ValueError("Invalid or unsupported video file.") from exc). Whenseek_mode="approximate"is in effect, the message additionally tells theuser to retry with
"exact":Bundled docs: the "Video Decoding Backend" section gains operational
guidance for the two TorchCodec knobs — when
num_ffmpeg_threads=0(default) beats
1and vice versa, with measured numbers (768 frames of1080p H.264 on 16 cores: ~10 s at
0vs ~49 s at1), and theapproximate-mode metadata caveat with its new client-error behavior.
Duplicate check
Searched open PRs/issues for torchcodec error handling and video decode
error mapping: no existing work. Related context: #46609 (torchcodec
backend introduction, where
seek_modeexposure was discussed) and theregistry's own TODO to migrate raw-exception fallbacks to
VLLMError.Test Plan
test_torchcodec_decode_failure_is_client_errorintests/multimodal/test_video.py: RuntimeError from the decoder surfacesas
ValueErrorwith the original exception chained; the seek-mode hintappears only when
seek_mode="approximate".pytest tests/multimodal/test_video.py -k torchcodec_decode_failure -qpre-commit run --files <changed files>Test Result
1 passed; pre-commit all hooks pass (ruff, mypy, markdownlint, DCO).media_io_kwargs: {"video": {"seek_mode": "approximate"}}on astream-copied 60 s cut now returns the HTTP 400 above (previously 500 +
ASGI traceback); the same file decodes fine with default
exact(16.5 s request, 35,149 prompt tokens); unrelated requests unaffected.
AI Disclosure
Developed with AI assistance (Claude Fable 5). The human submitter has
reviewed every changed line and run the tests above.