Invalid Chapters_Pos_Begin

[zoriya]

With some files, Chapters_Pos_Begin point to an extra menu track that is not a chapter.

Here is the result of mediainfo --Output=JSON video/spirited_away\(1\).mp4 | jq '.media.track.[] | select(."@type" == "Menu")' for reference

{
  "@type": "Menu",
  "StreamOrder": "2",
  "ID": "3",
  "Format": "Timed Text",
  "CodecID": "text",
  "Duration": "7476.552",
  "Language": "en",
  "extra": {
    "Encoded_Date": "2021-06-18 01:48:09 UTC",
    "Tagged_Date": "2021-06-18 01:48:09 UTC",
    "Menu_For": "1,2",
    "_00_00_00_000": "Chapter 1",
    "_00_12_29_916": "Chapter 2",
    "_00_20_18_843": "Chapter 3",
    "_00_30_05_804": "Chapter 4",
    "_00_41_08_633": "Chapter 5",
    "_00_51_34_508": "Chapter 6",
    "_01_06_37_952": "Chapter 7",
    "_01_16_39_553": "Chapter 8",
    "_01_24_54_339": "Chapter 9",
    "_01_31_15_261": "Chapter 10",
    "_01_37_45_651": "Chapter 11",
    "_01_41_06_018": "Chapter 12",
    "_01_45_19_104": "Chapter 13",
    "_01_52_50_389": "Chapter 14",
    "_01_55_12_239": "Chapter 15",
    "_02_00_53_580": "Chapter 16",
    "_02_04_34_717": "Chapter 17"
  }
}

Here is an example code and what it outputs:

chapters_begin := mi.Parameter(mediainfo.StreamMenu, 0, "Chapters_Pos_Begin")
chapters_end := mi.Parameter(mediainfo.StreamMenu, 0, "Chapters_Pos_End")
printf("Chapters %d %d\n", chapters_begin, chapters_end)
for i := chapters_begin; i < chatpers_end; i++ {
	printf("Chapter %d: %s\n", i, mi.GetI(mediainfo.StreamMenu, 0, i, mediainfo.InfoName))
}

Chapters: 101 118
Chapter 101: Encoded_Date
Chapter 102: Tagged_Date
Chapter 103: Menu For
Chapter 104: 00:00:00.000
Chapter 105: 00:12:29.916
Chapter 106: 00:20:18.843
Chapter 107: 00:30:05.804
Chapter 108: 00:41:08.633
Chapter 109: 00:51:34.508
Chapter 110: 01:06:37.952
Chapter 111: 01:16:39.553
Chapter 112: 01:24:54.339
Chapter 113: 01:31:15.261
Chapter 114: 01:37:45.651
Chapter 115: 01:41:06.018
Chapter 116: 01:45:19.104

There is the right number of chapters, but the start/end is offset by 3. Is there something I did wrong on my end?

[JeromeMartinez]

Please share a file with "offset by 3", easier for debugging. here or link to be sent at info@mediaarea.net if it can not be publicly shared.

[zoriya]

I just did, thanks for the help!