VLC thinks chapters in mp4 files are subtitles

Windows 3.0.12, Android 3.3.4

With any MP4 file that has a chapter stream, VLC will show it as an available subtitle stream (e.g., Track 1 - English). When that subtitle is enabled, VLC will immediately display the start timecode for the current chapter as if it were a subtitle. Seeking forward or backward causes this subtitle to vanish. Reaching the next or previous chapter marker by any method will cause the timecode for that chapter to appear. Seeking with the seek bar does not cause reemergence.

VLC has seems to have no such issue with MKV files with chapters.

added Component::Demuxers: MP4 Status::needs more info labels

Missing sample...

https://www.dropbox.com/s/kvaut4qk0202kxa/Westworld%20%281973%29.mp4?dl=0

Problem reproduced. Unrelated to the topic of the ticket, the aspect ratio of the video does not seem to be correct either.

Please move the file to our site.

I’ll do tomorrow. It is too big to move on mobile.

Thank you. The aspect ratio was modified to stretch and fit a 16:9 display. A personal preference.

added Version::3.0.x label

removed Status::needs more info label

I just ran into the same issue. In certain applications using VLCKit it doesn't just cause false subtitles to show, but even takes precedence over other subtitles, which makes this more detrimental.

Please send a sample :)

I can do you one better: here's how to make one with ffmpeg:

ffmpeg -i BigBuckBunny.mp4 -f ffmetadata FFMETADATAFILE.txt
cat <<EOF >> FFMETADATAFILE.txt
[CHAPTER]
TIMEBASE=1/1000
START=1
END=48000
title=Test 1

[CHAPTER]
TIMEBASE=1/1000
START=48001
END=96000
title=Test 2
EOF
ffmpeg -i BigBuckBunny.mp4 -i FFMETADATAFILE.txt -map_metadata 1 -codec copy BigBuckBroken.mp4

Just select the subtitle track and the issue appears.

changed milestone to %3.0.x maintenance

qtff

kTrackReferenceChapterList is defined in Movies.h. It has the value 'chap'.
The text track that constitutes the chapter list does not need to be enabled, and normally is not. If it is enabled,
the text track will be displayed as part of the movie, just like any other text track, in addition to functioning as
a chapter list.
If more than one enabled track includes a 'chap' track reference, QuickTime uses the first chapter list that it
finds.

mentioned in merge request !3564 (merged)

added Status::fixed label

closed

@jbk This is not fixed. I just tested it(compiling from source on the 3.0.x branch) and the chapters are still selectable as subtitles. I also tried with ES_PRIORITY_NOT_SELECTABLE with the same result. Please reopen.

I mentioned this is the expected behaviour in the previous comment by quoting the spec

Then it's "broken" in version 4 as there it can never be selected in so far as I can tell?

mentioned in merge request !3584 (closed)

mentioned in merge request !3589 (merged)

assigned to @fcartegnie

removed Status::fixed label

reopened

waiting for backport of !3589 (merged)

changed milestone to %3.0.19

Thx for !3589 (merged)

mentioned in merge request !3615 (merged)

closed

added Status::fixed label