{"record":{"id":"c3daad61f1c2e97e","repo":"remotion-dev/remotion","slug":"expected-length-of-segmentid-to-be-greater-or-e","errorCode":null,"errorMessage":"Expected length of ${segmentId} to be greater or equal 0","messagePattern":"Expected length of (.+?) to be greater or equal 0","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/media-parser/src/containers/webm/segments.ts","lineNumber":146,"sourceCode":"};\n\nconst parseSegment = async ({\n\tsegmentId,\n\tlength,\n\titerator,\n\theaderReadSoFar,\n\tstatesForProcessing,\n\tlogLevel,\n}: {\n\tsegmentId: string;\n\tlength: number;\n\titerator: BufferIterator;\n\theaderReadSoFar: number;\n\tstatesForProcessing: WebmRequiredStatesForProcessing | null;\n\tlogLevel: MediaParserLogLevel;\n}): Promise<MatroskaSegment | null> => {\n\tif (length < 0) {\n\t\tthrow new Error(`Expected length of ${segmentId} to be greater or equal 0`);\n\t}\n\n\titerator.counter.decrement(headerReadSoFar);\n\n\tconst offset = iterator.counter.getOffset();\n\tconst ebml = await parseEbml(iterator, statesForProcessing, logLevel);\n\tif (ebml === null) {\n\t\treturn null;\n\t}\n\n\tif (!statesForProcessing) {\n\t\treturn ebml;\n\t}\n\n\tconst remapped = await postprocessEbml({\n\t\toffset,\n\t\tebml,\n\t\tstatesForProcessing,","sourceCodeStart":128,"sourceCodeEnd":164,"githubUrl":"https://github.com/remotion-dev/remotion/blob/78fe4bb3fdb5a2cd68724393d63cb223db333fa7/packages/media-parser/src/containers/webm/segments.ts#L128-L164","documentation":"parseSegment throws if the decoded size VInt is negative. VInts in EBML are unsigned, so a negative length indicates either a decoding bug in getVint (sign mishandling) or corrupted size bytes that produced an out-of-range integer. The segmentId is interpolated for diagnosis.","triggerScenarios":"Corrupted size octets in an EBML element header that decode to a value interpreted as negative by getVint, or a regression in VInt decoding for large widths. Reachable on any element parsed via parseSegment once the size is negative.","commonSituations":"Bit-flipped size bytes in storage/transfer, or files truncated so a size VInt spans EOF and yields garbage.","solutions":["Re-download or re-mux the source ('ffmpeg -i in.mkv -c copy out.mkv').","If reproducible only after an upgrade, pin/roll back @remotion/media-parser and report a VInt regression.","Try Mediabunny."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n  await parseMedia({src: 'in.mkv'});\n} catch (err) {\n  if (err instanceof Error && /Expected length of .* to be greater or equal 0/.test(err.message)) {\n    throw new Error('Negative EBML size decoded; file is corrupt or reader returned bad bytes.', {cause: err});\n  }\n  throw err;\n}","preventionTips":["Re-download or re-mux sources that trigger size errors.","If reproducible only after a version bump, roll back @remotion/media-parser and report a VInt regression.","Verify file integrity (checksum) before parsing."],"tags":["webm","matroska","ebml","media-parser","vint","corruption"],"backgroundTag":null,"analyzedSha":"78fe4bb3fdb5a2cd68724393d63cb223db333fa7","analyzedAt":"2026-08-12T17:18:50.444Z","schemaVersion":2},"datasetVersion":"2026-08-12T18:17:37.767Z"}