VLC 3.3.0 beta 7 have some bug in Android 10 on select subtitles and group videos

[jamesmccoy0405]

I have found the APP setting that caused the group videos bug,
Setting -> Interface -> Video playlist mode.
If Video playlist mode is on, had the bug,
If Video playlist mode is off, everything is ok.

test phones:
phone 1.
VLC version: 3.3.4
Android version: 10
Phone infermation: Essential PH-1 (QQ1A.200105.032)

phone 2.
VLC version: 3.3.4
Android version: 11
Phone infermation: Redmi K30

[jamesmccoy0405]

1.group video no, Video playlist mode off > vlc_logcat_20210221_103956.log
2.group video yes, Video playlist mode off > vlc_logcat_20210221_104033.log
3.group video no, Video playlist mode on > vlc_logcat_20210221_104157.log
4.group video yes, Video playlist mode on > vlc_logcat_20210221_104244.log

play the for.all.mankind.s02e01.720p.web.h264-glhf.mkv which after american.gods.s03e0, the 4th is wrong.

the log files had been update in google drive
https://drive.google.com/file/d/1NgTX6T ... sp=sharing

[evadedave]

Almost one year has passed and this 'incorrect playback after video grouping' bug is still very much present in VLC for Android 3.3.4. Any chance at all of it being fixed sometime soon? It's extremely irritating!

BTW, thanks a lot to James McCoy for figuring out that turning Video Playlist Mode on along with Grouping is what triggers this bug.

[evadedave]

@Aza: It seems you've closed https://code.videolan.org/videolan/vlc- ... ssues/1421 as "cannot reproduce". I suspect you've missed the note from James about this bug manifesting itself only when Video Playlist Mode is turned on along with Grouping. One that is done this irritating bug (still present in 3.4.0 BTW) is trivial to reproduce. Can you please try, then reopen the issue (and of course fix if you can)? Thanks.

[Aza]

I just tried again to reproduce it and was finally able to!

I'll take a look.

[Aza]

I think I fixed it: https://code.videolan.org/videolan/vlc- ... uests/1124
The fix won't probably be in 3.4.1 though. You'll have to wait for 3.4.2.

[evadedave]

Hallelujah! As long as it's finally fixed don't mind waiting a bit longer. Any ETA for 3.4.2?

[Aza]

If everything is fine with 3.4.1 (which is for now), the beta for 3.4.2 should start soon.

[evadedave]

@Aza: I just got 3.4.2 via F-Droid and this was the very first thing I tested. Unfortunately it seems the bug still persists. Really quite disappointed.

Looks like https://code.videolan.org/videolan/vlc- ... ssues/1421 needs to be reopened...

[Aza]

I just tried again and was not able to reproduce. Could you please provide a screencast of your issue?

[evadedave]

Difficult to provide a screencast right now, but here are steps to reproduce the issue in the simplest and easiest manner:

1. Fresh install of VLC, no videos. Group videos by name is enabled by default I think. Under Settings > Interface make sure Video Playlist Mode is turned OFF first for testing.

2. Add just 4 videos, can be the same file copied 4 times. "File 1.mp4", "File 2a.mp4", "File 2b.mp4" and "File 3.mp4".

3. Play "File 1.mp4", correct file plays. Play "File 3.mp4", correct file plays again (can see file name during playback on touching the screen.)

4. Now important, turn ON Video Playlist Mode.

5. Play "File 1.mp4", correct file plays. But now play "File 3.mp4", and instead WRONG file "File 2b.mp4" plays! Why? Because with Video Playlist Mode on VLC stupidly counts INSIDE groups, so when THIRD file from beginning is to be played:

Position 1) File 1
Position 2) Group of File 2 (entire group should be ONE position)
Position 3) File 3 ---> To be played

Instead it counts wrongly INSIDE groups and plays wrong file in position 3:

Position 1) File 1
Position 2) File 2a
Position 3) File 2b ---> Wrong file played!
Position 4) File 3 ---> To be played

More the files in any group, obviously more the position will be wrong when attempting to play any files after the group.

Really, this bug is so, so very obvious that I can't see how it can escape observation!

[Aza]

I am still not able to reproduce, even with "Video Playlist Mode" enabled. Could you please try with 3.4.3 beta (http://get.videolan.org/testing/android/3.4.3-Beta-4/) and tell me if you're still able to reproduce?

[evadedave]

Uninstalled 3.4.2 and tested the beta and the bug does seem to have been fixed in 3.4.3 beta 3. Changelog doesn't mention this issue, nor that the fix had been delayed from 3.4.2 to 3.4.3. Anyway, glad it's finally done but guess I need to wait for 3.4.3 now since I don't run unstable betas. TYVM.