The VideoLAN Forums

Hi

The following TS file has some teletext on page 888. VLC only displays "a part of" this teletext.
I think it's a VLC bug because I can see full captions with apps like CCExtractor and AVC Analyzer.

For example, the first caption should be on 2 lines:

to the scene of a huge fire
at a tyre-recycling facility.

but VLC only displays 1 line:

to the scene of a huge fire
<nothing/gap>

Reproduced on both macOS/VLC 3.0.14 and Win/VLC 3.0.18.

TS file: https://mj-s.com/TeletextIssue.ts
Expected teletext output: https://mj-s.com/TeletextIssue.srt (CcExtractor'ed from the above TS file)

Should I fill a bug report?
(tehere are some existing BRs in those lines but their desc are too vague, or talking about "fully missng captions" like https://code.videolan.org/videolan/vlc/-/issues/24690)

I can't play your file with VLC 3.0.18 although it does play with other players including FFPlay even though the latter gives a lot of error messages:

VLC:
FFplay:

Thanks for giving it a try Lotesdelere!
!!?
I think you had a download issue (?): as I said, I tested this file on both macOS/VLC 3.0.14 and Win/VLC 3.0.18 and it plays fine (I just cleared my caches and re-downloaded it on both OS just to make sure...). My only issue with this file is about teletext...

Well, we need a better sample file anyway.

Wow! First a lie, then this! Thanks that helps a lot!

I assume you know how a live-captured TS stream looks like (if not, the errors you posted above are irrelevant).

DVBViewer (with the TS file linked here):


VLC (with the TS file linked here):


All apps I've tried display/extract the teletext correctly, except VLC.
The idea was to ping YOU about a VLC bug (personally I don't care, I'll use DVBViewer for teletext from now on).
Enough time wasted on this for me, so no more uploads, sorry.

Wow! First a lie, then this!

I beg your pardon ?

the errors you posted above are irrelevant

I've posted what I got on the machine I tested with.

Enough time wasted on this for me, so no more uploads, sorry.

No sample file, no fix.

I beg your pardon ?

"I can't play your file with VLC 3.0.18": not true, it plays fine in VLC 3.0.18, confirmed by some colleagues on various systems.

No sample file, no fix.

But you have a sample file! Sigh. What I'm telling you is that the errors you see are irrelevant to the issue, they are mostly due to the way the file has been captured (e.g. PMT arriving afterwards, etc).

What's going on here is that you think "this dumb guy has posted a crappy file, let's ignore it". Unfortunately, it isn't the case. The file is valid and I know why I'm reporting it, I even have a vague idea of what could trigger the bug: some of these subtitles arrive in 2 steps, e.g.:
PTS n:

to the scene of a huge fire

PTS n+x:

to the scene of a huge fire
at a tyre-recycling facility.

What's going on here is that you think "this dumb guy has posted a crappy file, let's ignore it".

If I wanted to ignore it I wouldn't even keep on answering.
I could finally play your sample file with VLC, I don't know why it didn't work the first time. Anyway, I can confirm your report, some lines are missing and all of the subtitles seem to be late in sync to be displayed compared to other players.

You should create a new report ticket on the VLC issues tracker with your above report, the link to your sample file and the link to this thread:
https://code.videolan.org/videolan/vlc/-/issues

If possible, because of this:
https://forum.videolan.org/viewtopic.ph ... 27#p538427

Thanks Lotesdelere!
As suspected, I've created aGitLab account like 24h ago but still have no feedback, and I can't login: "Your account is pending approval from your GitLab administrator and hence blocked. Please contact your GitLab administrator if you think this is an error."
In the thread you've quoted, Rémi Denis-Courmont says "new user registration is currently disabled due to excessive spam account creations".