{"record":{"id":"44485447df986efb","repo":"TeamNewPipe/NewPipe","slug":"the-provided-mp4-doesn-t-have-the-moov-box","errorCode":null,"errorMessage":"The provided Mp4 doesn't have the 'moov' box","messagePattern":"The provided Mp4 doesn't have the 'moov' box","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java","lineNumber":109,"sourceCode":"        Moov moov = null;\n        int i;\n\n        while (box.type != ATOM_MOOF) {\n            ensure(box);\n            box = readBox();\n\n            switch (box.type) {\n                case ATOM_MOOV:\n                    moov = parseMoov(box);\n                    break;\n                case ATOM_SIDX:\n                case ATOM_MFRA:\n                    break;\n            }\n        }\n\n        if (moov == null) {\n            throw new IOException(\"The provided Mp4 doesn't have the 'moov' box\");\n        }\n\n        tracks = new Mp4Track[moov.trak.length];\n\n        for (i = 0; i < tracks.length; i++) {\n            tracks[i] = new Mp4Track();\n            tracks[i].trak = moov.trak[i];\n\n            if (moov.mvexTrex != null) {\n                for (final Trex mvexTrex : moov.mvexTrex) {\n                    if (tracks[i].trak.tkhd.trackId == mvexTrex.trackId) {\n                        tracks[i].trex = mvexTrex;\n                    }\n                }\n            }\n\n            switch (moov.trak[i].mdia.hdlr.subType) {\n                case HANDLER_VIDE:","sourceCodeStart":91,"sourceCodeEnd":127,"githubUrl":"https://github.com/TeamNewPipe/NewPipe/blob/9e8be091560a69f35d44bd252eb00bc7911c977b/app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java#L91-L127","documentation":"After Mp4DashReader.parse() accepts the ftyp brand and loops reading boxes until it hits the first moof, it requires that a moov box was encountered in that initial sequence. moov holds track metadata (tkhd, trex, etc.); if none was parsed, the file cannot be demuxed and an IOException is thrown. A DASH init segment normally carries the moov; its absence means the file is incomplete or is a media segment without its init segment.","triggerScenarios":"Parsing a fragmented MP4 that contains moof/mdat boxes but no moov — e.g. an MP4 'media segment' (moof+mdat) streamed without its accompanying initialization segment (moov). Also a file whose moov sits after the first moof in an unexpected layout this reader does not scan past.","commonSituations":"Downloading only the media segments of a DASH manifest and concatenating them without the init segment; a live stream where the init segment was missed; a download manager that dropped the first chunk.","solutions":["Ensure the init segment (containing moov) is prepended before parsing — fetch and concatenate the DASH initialization URL first.","Validate the source is a complete self-init fragmented MP4, not a bare media segment.","If building the input from multiple range requests, confirm the moov range was successfully downloaded (check HTTP 200 and full byte count).","Re-fetch the stream from the start to include the moov box."],"exampleFix":"// before — parsing a media segment without init\nnew Mp4DashReader(mediaSegmentStream).parse(); // IOException: no moov\n\n// after — prepend the init segment (which carries moov)\nSharpStream combined = new ConcatStream(initSegmentStream, mediaSegmentStream);\nnew Mp4DashReader(combined).parse();","handlingStrategy":"validation","validationCode":"// Ensure the init segment (carrying moov) is concatenated before the media segment.\nif (!hasInitSegment) {\n    throw new IllegalStateException(\"prepend the DASH init segment before parsing\");\n}\nnew Mp4DashReader(concatenatedStream).parse();","typeGuard":"// After a shallow scan, confirm a moov box exists in the byte range to be parsed.\npublic static boolean containsMoovBox(SharpStream s, long scanLimit) throws IOException {\n    long pos = s.position();\n    try {\n        long end = Math.min(scanLimit, s.isLengthKnown() ? s.length() : scanLimit);\n        while (s.position() < end) {\n            int size = readInt(s); int type = readInt(s);\n            if (type == 0x6D6F6F76 /*moov*/) return true;\n            s.skip(size - 8);\n        }\n        return false;\n    } finally { s.seek(pos); }\n}","tryCatchPattern":"try {\n    reader.parse();\n} catch (IOException e) {\n    if (e.getMessage().contains(\"moov\")) {\n        // missing init segment — fetch and prepend it, then retry once with a fresh reader\n        fetchAndPrependInitSegment();\n        new Mp4DashReader(combinedStream).parse();\n    } else throw e;\n}","preventionTips":["Always download and concatenate the DASH initialization segment first.","Verify each range request returns HTTP 206 with the full byte count.","Validate the file contains a moov box with a box scanner before deep parsing.","Do not assume a media segment is self-contained."],"tags":["mp4","dash","container","missing-metadata","java"],"backgroundTag":null,"analyzedSha":"9e8be091560a69f35d44bd252eb00bc7911c977b","analyzedAt":"2026-08-14T00:11:33.519Z","schemaVersion":2},"datasetVersion":"2026-08-14T00:17:13.853Z"}