mp4-track 0.1.0

{
 "schema": "conformance-vectors/1",
 "generated": "2026-08-21",
 "tools": {
  "ffprobe": "ffprobe version 8.1.2 Copyright (c) 2007-2026 the FFmpeg developers",
  "reference_parser": "tools/vectors.py (independent Python box walk)",
  "mp4box_or_mp4dump": "not installed on the capture host; ffprobe is the sole external format checker"
 },
 "bounds": {
  "malformed_wall_time_ms": 2000,
  "malformed_peak_alloc_bytes": 67108864
 },
 "counts": {
  "valid": 14,
  "malformed": 20,
  "roundtrip": 7
 },
 "fixtures": [
  {
   "id": "m01_truncated_header_5_bytes",
   "file": "fixtures/m01_truncated_header_5_bytes.mp4",
   "kind": "malformed",
   "sha256": "2f77ba99dd627b02e1654a02b2fb9eaf877c4575d0fcb2c2971ef6f1835bc76e",
   "size_bytes": 5,
   "origin": "synth.py: first 5 bytes of v02",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x8c5018000] moov atom not found",
     "fixtures/m01_truncated_header_5_bytes.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "Truncated",
    "why": "fewer than 8 bytes for a box header",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m02_truncated_largesize_header",
   "file": "fixtures/m02_truncated_largesize_header.mp4",
   "kind": "malformed",
   "sha256": "462538f7a2ee2d4befd47909d5656b50223f88dd042ba3c437c375d8c2d8c93b",
   "size_bytes": 12,
   "origin": "synth.py: first 12 bytes of v10",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0xc15018000] moov atom not found",
     "fixtures/m02_truncated_largesize_header.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "Truncated",
    "why": "size==1 but fewer than 16 header bytes",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m03_box_size_smaller_than_header",
   "file": "fixtures/m03_box_size_smaller_than_header.mp4",
   "kind": "malformed",
   "sha256": "812129e45d59aef90cd8ed9ba788586d728ddeb690f840a6722dc32dcfb6560b",
   "size_bytes": 17400,
   "origin": "synth.py: 'free' header with size 4 inserted after ftyp in v02",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x79d01c000] moov atom not found",
     "fixtures/m03_box_size_smaller_than_header.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "BoxSizeTooSmall",
    "why": "declared size 4 < 8-byte header",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m04_nested_box_size_zero",
   "file": "fixtures/m04_nested_box_size_zero.mp4",
   "kind": "malformed",
   "sha256": "944982baab50380afaa83ab8186c30987fc313a67bead61d2f122818317a9622",
   "size_bytes": 17392,
   "origin": "synth.py: stss size field set to 0 in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "ZeroSizeNested",
    "why": "size==0 on a box that is not top level",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m05_child_exceeds_parent",
   "file": "fixtures/m05_child_exceeds_parent.mp4",
   "kind": "malformed",
   "sha256": "4bf92840140445381e3e40a136c4195f263cc9386dfb3271ad99bfaf73099a3d",
   "size_bytes": 17392,
   "origin": "synth.py: trak size field set to moov's size in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0xa29034000] Broken file, trak/mdat not at top-level"
    ],
    "nb_streams": 1
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "ChildExceedsParent",
    "why": "trak end past moov end",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m06_self_referential_moov",
   "file": "fixtures/m06_self_referential_moov.mp4",
   "kind": "malformed",
   "sha256": "4615612ec12360c39c9ff08365738f587303527a9e8e128d8aded08bb31c422d",
   "size_bytes": 17392,
   "origin": "synth.py: mvhd header overwritten with type 'moov' and moov's size in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 0
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "ChildExceedsParent",
    "why": "child 'moov' of the parent's own size",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m07_stsc_samples_per_chunk_zero",
   "file": "fixtures/m07_stsc_samples_per_chunk_zero.mp4",
   "kind": "malformed",
   "sha256": "1dd4935e26decc5d3a4a51e2a6df9b57921c6ce4e5d476520a965d5dbaa5f70d",
   "size_bytes": 17392,
   "origin": "synth.py: first stsc entry samples_per_chunk set to 0 in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "InvalidSampleTable",
    "why": "stsc samples_per_chunk == 0",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m08_stts_count_exceeds_stsz",
   "file": "fixtures/m08_stts_count_exceeds_stsz.mp4",
   "kind": "malformed",
   "sha256": "994b15ef0177917b722badf56cc0bd8198e99e1578e08cafba32fad01455ceaa",
   "size_bytes": 17392,
   "origin": "synth.py: first stts entry sample_count set to 0x00FFFFFF in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "InvalidSampleTable",
    "why": "stts sample total != stsz sample count",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m09_emsg_unterminated_string",
   "file": "fixtures/m09_emsg_unterminated_string.mp4",
   "kind": "malformed",
   "sha256": "8d8957857f205c694bf1aa9b47e82e0509adf6f4c7063a51481b6298196642c0",
   "size_bytes": 17412,
   "origin": "synth.py: 20-byte emsg v0 with body 'urn:test' and no NUL inserted after ftyp in v02; stco shifted +20",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "Malformed",
    "why": "emsg scheme_id_uri runs to box end without NUL",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m10_co64_offset_above_u32",
   "file": "fixtures/m10_co64_offset_above_u32.mp4",
   "kind": "malformed",
   "sha256": "daf6d7c13b156f7165a71910a34695295584cd538afc4f0219950c389dad2c73",
   "size_bytes": 17596,
   "origin": "synth.py: first co64 entry set to 0x100000010 in v08",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "sample_read",
    "error_kind": "SampleOutOfFile",
    "why": "chunk offset 0x100000010 exceeds file length; offset must be carried as u64 and compared, never truncated",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m11_stsz_sum_overflows_u32",
   "file": "fixtures/m11_stsz_sum_overflows_u32.mp4",
   "kind": "malformed",
   "sha256": "43488c25ca6941485beeb4dc352d8f010c88fd46bc9449b4e92f7ecd549de7a3",
   "size_bytes": 17392,
   "origin": "synth.py: first three stsz entries set to 0xFFFFFFFF in v01",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x937018000] Sample size 4294967295 is too large"
    ],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "sample_read",
    "error_kind": "SampleOutOfFile",
    "why": "three 0xFFFFFFFF sizes in one chunk; sum exceeds u32 and the file",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m12_giant_largesize_moov",
   "file": "fixtures/m12_giant_largesize_moov.mp4",
   "kind": "malformed",
   "sha256": "880d30eaaea3285658c31325555ba79b3472dacda91fcb4c19dc140ee1170fd6",
   "size_bytes": 17400,
   "origin": "synth.py: moov re-emitted with largesize 0xFFFFFFFFFFFFFF00 in v02",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0xaa2c3c000] moov atom not found",
     "fixtures/m12_giant_largesize_moov.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "BoxExceedsFile",
    "why": "largesize 0xFFFFFFFFFFFFFF00; must fail before allocating the body",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m13_giant_stsz_count",
   "file": "fixtures/m13_giant_stsz_count.mp4",
   "kind": "malformed",
   "sha256": "72f04cef64b2e6720c89c1ddd19e90a68463dfd036bb23ebd2a26956296b6ee8",
   "size_bytes": 17392,
   "origin": "synth.py: stsz sample_count set to 0xFFFFFFFF in v02",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x97d018000] error reading header",
     "fixtures/m13_giant_stsz_count.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "Malformed",
    "why": "stsz count 0xFFFFFFFF in a small box; allocation is bounded by box size",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m14_deep_nesting_4096",
   "file": "fixtures/m14_deep_nesting_4096.mp4",
   "kind": "malformed",
   "sha256": "b0ae4b21e956c7a1132ca7440878ba3e8c176ca9a6fdd849547c553417d25a6d",
   "size_bytes": 32816,
   "origin": "synth.py: ftyp + moov containing 4096 nested udta boxes around an empty free box",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x92cc3c000] Atoms too deeply nested",
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x92cc3c000] error reading header",
     "fixtures/m14_deep_nesting_4096.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "NestingTooDeep",
    "why": "4096 nested udta; depth limit 32",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m15_missing_moov",
   "file": "fixtures/m15_missing_moov.mp4",
   "kind": "malformed",
   "sha256": "be27b7c09bd050e266238eff5fa313e908fd7fa70d9d0ef7d66da90c7abd3ddc",
   "size_bytes": 104,
   "origin": "synth.py: ftyp of v02 + a 72-byte mdat",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x761018000] moov atom not found",
     "fixtures/m15_missing_moov.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "MissingBox",
    "why": "no moov in the file",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m16_truncated_mdat",
   "file": "fixtures/m16_truncated_mdat.mp4",
   "kind": "malformed",
   "sha256": "20309c60e11b9d8fe864edae1385c838f86e289397088c1b5b207b6c23dc9cb7",
   "size_bytes": 15392,
   "origin": "synth.py: v02 minus its last 2000 bytes",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [
     "[h264 @ 0x864ca1880] Invalid NAL unit size (2322 > 557).",
     "[h264 @ 0x864ca1880] missing picture in access unit with size 561",
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x865018000] stream 1, offset 0x4305: partial file"
    ],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "sample_read",
    "error_kind": "SampleOutOfFile",
    "why": "tables parse; the last samples are past EOF",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m17_moov_size_exceeds_file",
   "file": "fixtures/m17_moov_size_exceeds_file.mp4",
   "kind": "malformed",
   "sha256": "de592eb538efc2a4b47707b4111b92a431e34043f3216dd511fa283df618ea60",
   "size_bytes": 17392,
   "origin": "synth.py: moov size field increased by 100000 in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "BoxExceedsFile",
    "why": "moov declared size past EOF",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m18_stsd_zero_entries",
   "file": "fixtures/m18_stsd_zero_entries.mp4",
   "kind": "malformed",
   "sha256": "37e80bd1d3de345ab344d169690f185b51d893e74ddd248a53465a4f44476f9f",
   "size_bytes": 17392,
   "origin": "synth.py: video stsd entry_count set to 0 in v02",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f5018000] invalid STSD entries 0",
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f5018000] error reading header",
     "fixtures/m18_stsd_zero_entries.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "InvalidSampleTable",
    "why": "stsd entry_count 0 for a track that has samples",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m19_trun_giant_sample_count",
   "file": "fixtures/m19_trun_giant_sample_count.mp4",
   "kind": "malformed",
   "sha256": "fc0df89a296be64debc16e0bbfdafd787f8fd6abdf3c202af934b00eabbe8ebb",
   "size_bytes": 17736,
   "origin": "synth.py: first trun sample_count set to 0xFFFFFFF0 in v07",
   "ffprobe": {
    "exit_code": 1,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0xa5101c000] error reading header",
     "fixtures/m19_trun_giant_sample_count.mp4: Invalid data found when processing input"
    ],
    "nb_streams": null
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "Malformed",
    "why": "trun sample_count 0xFFFFFFF0 in a small box",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "m20_mdhd_timescale_zero",
   "file": "fixtures/m20_mdhd_timescale_zero.mp4",
   "kind": "malformed",
   "sha256": "850792c8b96ff079d57dbdb759873257f4443712e450b262406ec759f120ab05",
   "size_bytes": 17392,
   "origin": "synth.py: video mdhd timescale set to 0 in v02",
   "ffprobe": {
    "exit_code": 0,
    "stderr_head": [
     "[mov,mp4,m4a,3gp,3g2,mj2 @ 0x9f101c000] Invalid mdhd time scale 0, defaulting to 1"
    ],
    "nb_streams": 2
   },
   "expect": {
    "result": "err",
    "stage": "open",
    "error_kind": "InvalidTimescale",
    "why": "mdhd timescale 0",
    "bounds": {
     "wall_time_ms": 2000,
     "peak_alloc_bytes": 67108864,
     "no_panic": true,
     "no_hang": true
    }
   }
  },
  {
   "id": "v01_h264_aac_moov_last",
   "file": "fixtures/v01_h264_aac_moov_last.mp4",
   "kind": "valid",
   "sha256": "79ee3c448055911dff0df94ba49400334652804c52557b0b3b4ded9a8d906b46",
   "size_bytes": 17392,
   "origin": "tools/gen-fixtures.sh",
   "ffprobe": {
    "exit_code": 0,
    "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    "duration": "1.000000",
    "nb_streams": 2,
    "tags": {
     "major_brand": "isom",
     "minor_version": "512",
     "compatible_brands": "isomiso2avc1mp41",
     "encoder": "Lavf62.12.102"
    },
    "streams": [
     {
      "index": 0,
      "codec_name": "h264",
      "codec_type": "video",
      "codec_tag_string": "avc1",
      "profile": "Constrained Baseline",
      "width": 64,
      "height": 48,
      "sample_rate": null,
      "channels": null,
      "time_base": "1/12800",
      "start_pts": 0,
      "duration_ts": 12800,
      "nb_frames": "25",
      "nb_read_packets": "25",
      "r_frame_rate": "25/1",
      "has_b_frames": 0
     },
     {
      "index": 1,
      "codec_name": "aac",
      "codec_type": "audio",
      "codec_tag_string": "mp4a",
      "profile": "LC",
      "width": null,
      "height": null,
      "sample_rate": "48000",
      "channels": 1,
      "time_base": "1/48000",
      "start_pts": 0,
      "duration_ts": 48000,
      "nb_frames": "48",
      "nb_read_packets": "48",
      "r_frame_rate": "0/0",
      "has_b_frames": null
     }
    ]
   },
   "reference": {
    "file_len": 17392,
    "top_level": [
     {
      "type": "ftyp",
      "offset": 0,
      "header_len": 8,
      "size": 32,
      "largesize": false,
      "size_zero": false
     },
     {
      "type": "free",
      "offset": 32,
      "header_len": 8,
      "size": 8,
      "largesize": false,
      "size_zero": false
     },
     {
      "type": "mdat",
      "offset": 40,
      "header_len": 8,
      "size": 15402,
      "largesize": false,
      "size_zero": false
     },
     {
      "type": "moov",
      "offset": 15442,
      "header_len": 8,
      "size": 1950,
      "largesize": false,
      "size_zero": false
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   },
   "expect": {
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         "dts": 36864,
         "cts_offset": 0,
         "sync": true,
         "chunk": 20,
         "sdi": 1
        },
        {
         "n": 38,
         "offset": 17773,
         "size": 149,
         "dts": 37888,
         "cts_offset": 0,
         "sync": true,
         "chunk": 21,
         "sdi": 1
        },
        {
         "n": 39,
         "offset": 17922,
         "size": 113,
         "dts": 38912,
         "cts_offset": 0,
         "sync": true,
         "chunk": 21,
         "sdi": 1
        },
        {
         "n": 40,
         "offset": 18105,
         "size": 125,
         "dts": 39936,
         "cts_offset": 0,
         "sync": true,
         "chunk": 22,
         "sdi": 1
        },
        {
         "n": 41,
         "offset": 18230,
         "size": 148,
         "dts": 40960,
         "cts_offset": 0,
         "sync": true,
         "chunk": 22,
         "sdi": 1
        },
        {
         "n": 42,
         "offset": 18642,
         "size": 149,
         "dts": 41984,
         "cts_offset": 0,
         "sync": true,
         "chunk": 23,
         "sdi": 1
        },
        {
         "n": 43,
         "offset": 18791,
         "size": 112,
         "dts": 43008,
         "cts_offset": 0,
         "sync": true,
         "chunk": 23,
         "sdi": 1
        },
        {
         "n": 44,
         "offset": 19145,
         "size": 129,
         "dts": 44032,
         "cts_offset": 0,
         "sync": true,
         "chunk": 24,
         "sdi": 1
        },
        {
         "n": 45,
         "offset": 19274,
         "size": 98,
         "dts": 45056,
         "cts_offset": 0,
         "sync": true,
         "chunk": 24,
         "sdi": 1
        },
        {
         "n": 46,
         "offset": 19646,
         "size": 155,
         "dts": 46080,
         "cts_offset": 0,
         "sync": true,
         "chunk": 25,
         "sdi": 1
        },
        {
         "n": 47,
         "offset": 24453,
         "size": 112,
         "dts": 47104,
         "cts_offset": 0,
         "sync": true,
         "chunk": 26,
         "sdi": 1
        },
        {
         "n": 48,
         "offset": 24565,
         "size": 123,
         "dts": 48128,
         "cts_offset": 0,
         "sync": true,
         "chunk": 26,
         "sdi": 1
        }
       ]
      }
     }
    ]
   },
   "expect": {
    "result": "ok"
   },
   "crosscheck": {
    "stream_count_matches_track_count": true,
    "per_track": [
     {
      "track_id": 1,
      "ffprobe_stream_index": 0,
      "packet_count_ffprobe": 25,
      "sample_count_reference": 25,
      "offset_size_sequence_equal": true,
      "sync_flags_equal": true,
      "dts_shift_reference_minus_ffprobe": 0,
      "pts_shift_reference_minus_ffprobe": 0,
      "ffprobe_time_base": "1/12800",
      "ffprobe_codec_name": "h264",
      "ffprobe_codec_tag_string": "avc1",
      "ffprobe_nb_read_packets": "25",
      "ffprobe_duration_ts": 12800,
      "ffprobe_start_pts": 0,
      "ffprobe_width": 64,
      "ffprobe_height": 48,
      "ffprobe_sample_rate": null,
      "ffprobe_channels": null,
      "ffprobe_profile": "Constrained Baseline"
     },
     {
      "track_id": 2,
      "ffprobe_stream_index": 1,
      "packet_count_ffprobe": 25,
      "sample_count_reference": 25,
      "offset_size_sequence_equal": true,
      "sync_flags_equal": true,
      "dts_shift_reference_minus_ffprobe": 0,
      "pts_shift_reference_minus_ffprobe": 0,
      "ffprobe_time_base": "1/12800",
      "ffprobe_codec_name": "h264",
      "ffprobe_codec_tag_string": "avc1",
      "ffprobe_nb_read_packets": "25",
      "ffprobe_duration_ts": 12800,
      "ffprobe_start_pts": 0,
      "ffprobe_width": 64,
      "ffprobe_height": 48,
      "ffprobe_sample_rate": null,
      "ffprobe_channels": null,
      "ffprobe_profile": "Constrained Baseline"
     },
     {
      "track_id": 3,
      "ffprobe_stream_index": 2,
      "packet_count_ffprobe": 48,
      "sample_count_reference": 48,
      "offset_size_sequence_equal": true,
      "sync_flags_equal": true,
      "dts_shift_reference_minus_ffprobe": 1024,
      "pts_shift_reference_minus_ffprobe": 1024,
      "ffprobe_time_base": "1/48000",
      "ffprobe_codec_name": "aac",
      "ffprobe_codec_tag_string": "mp4a",
      "ffprobe_nb_read_packets": "48",
      "ffprobe_duration_ts": 48000,
      "ffprobe_start_pts": 0,
      "ffprobe_width": null,
      "ffprobe_height": null,
      "ffprobe_sample_rate": "48000",
      "ffprobe_channels": 1,
      "ffprobe_profile": "LC"
     }
    ]
   }
  },
  {
   "id": "rt01_h264_aac",
   "kind": "roundtrip",
   "source": "v01_h264_aac_moov_last",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  },
  {
   "id": "rt02_hevc_aac",
   "kind": "roundtrip",
   "source": "v04_hevc_hvc1_aac",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  },
  {
   "id": "rt03_opus",
   "kind": "roundtrip",
   "source": "v06_opus_only",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  },
  {
   "id": "rt04_aac_only_elst",
   "kind": "roundtrip",
   "source": "v05_aac_only",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  },
  {
   "id": "rt05_h264_bframes_ctts",
   "kind": "roundtrip",
   "source": "v03_h264_bframes_ctts_elst",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  },
  {
   "id": "rt06_force_co64",
   "kind": "roundtrip",
   "source": "v01_h264_aac_moov_last",
   "writer_options": {
    "chunk_offsets": "co64"
   },
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "co64"
   }
  },
  {
   "id": "rt07_three_tracks",
   "kind": "roundtrip",
   "source": "v14_three_tracks",
   "writer_options": {},
   "expect": {
    "result": "ok",
    "equal_to_source": [
     "track count and order",
     "handler_type per track",
     "timescale per track",
     "sample count per track",
     "per-sample size, dts, cts_offset, sync sequence",
     "codec config payload bytes (avcC/hvcC/esds/dOps) per track",
     "edit list entries per track"
    ],
    "may_differ": [
     "byte offsets",
     "chunking (stsc/stco layout)",
     "box order",
     "ftyp minor_version and brands",
     "mvhd/tkhd timestamps"
    ],
    "ffprobe": "exit 0 on the written file; nb_read_packets per stream equal to the source's",
    "chunk_offset_box": "stco when every offset fits u32, else co64"
   }
  }
 ]
}