Showing Teletext

[spider58]

Hello.

Im using 3 functions below

libvlc_video_set_teletext(Handle, 100) // 100 is sample teletext page number
libvlc_video_get_teletext(Handle)
libvlc_toggle_teletext(Handle)

at these line
libvlc_video_set_teletext(Handle, 100) // 100 is sample teletext page number

crashes. "Attempted to read or write write protected memory"

if doesnot crashes, shows nothing instead of teletext this time

Am i wrong coding? is my functions calling order wrong? (I've tried too many order)

can someone put an example code for teletext? VLC.exe showing teletext perfect

[Rémi Denis-Courmont]

I would suggest checking that there are no obvious bugs in LibVLC. If not, then use a debugger.

[spider58]

I would suggest checking that there are no obvious bugs in LibVLC. If not, then use a debugger.

I've running on debug mode already. at this line

libvlc_video_set_teletext(Handle, 100) // 100 is sample teletext page number

"Attempted to read or write write protected memory" error.

i've tried to start logging. but no new line added to log file when program crashed.

[Jean-Baptiste Kempf]

Use gdb to debug.

[spider58]

Use gdb to debug.

i tried it

gdb myexefilename.exe

but gdb says "no debugging symbols found"

I think GDB is not for Vb.NET projects.

[BoDan]

Hi

i also like to call libvlc_video_set_teletext (p_mi, 100)

the function call crashes libvlc:

Within gdb:


Program received signal SIGSEGV, Segmentation fault.
0x69703168 in libvlccore!demux_PacketizerDestroy ()
from D:\Projects\Projec1\libvlccore.dll
(gdb)


gdb with: vlc-2.0.8-20130720-0202-win32-debug

Program received signal SIGSEGV, Segmentation fault.
EsOutControlLocked (args=0x12f348 "", i_query=65541, out=0x48b1240)
at ../../extras/package/win32/../../../src/input/es_out.c:2523
2523 ../../extras/package/win32/../../../src/input/es_out.c: No such file or
directory.
(gdb)





Help apreciated

[Rémi Denis-Courmont]

Patch needed.

[BoDan]

VLC Version V2.10

Bug still in teletext function

Program received signal SIGSEGV, Segmentation fault.
0x77de1b6c in libvlccore!demux_PacketizerDestroy ()
from C:\Program Files (x86)\VideoLAN\VLC\libvlccore.dll
(gdb)

sofar no magic from rincewind

[Jean-Baptiste Kempf]

Patch still needed

[McLion]

Crashes on Windows as well in about 90% cases when TXT is started.

[BoDan]

sorry, but don't get what it means "patch needed"

will the issue be adressed and fixed in a future update of the library (if it is a issue after all!)
- I did submit a bug report but was dissmissed due to lak of a provided testcase (#9614) ..

[Jean-Baptiste Kempf]

It means we need a sample.

[BoDan]

Sample exe provided in a "twin" bug report (wich is not allowed - i learn

Now, the sample is a delphi console program,
which allows to call either set_teletext () or audio_set_volume () from libvlc.dll on a running tv stream.
Both calls throw exception, so these two issues are bothering me (and others it seems).
Audio_set_volume does work on V2.08 (not on V2.10) by the way.

Bug report (#9614) was dissmised mainly because the provided sample
is not close enough to the vlc environment - as i understand

For my case a delphi console sample is the most close i can get for now..

So i find myself out in somewhere..

Help, support is greatly appreciated

[McLion]

Actually, I returned to 2.0.8 because 2.1 crashes far too often. 2.0.8 is much more stable ... and I am not only talking about the Teletext bug (Teletext does not crash for me on 2.0.8 ).

[BoDan]

Getting Teletext may depend on the module used to receive tv stream from device
i receive from dreambox, what device you use?

[McLion]

I am getting MPEG2-TS udp MC streams. Works perfect - including TXT - with 2.0.8.
However, 2.1.0 crashes about 90% when the TXT button is pressed and suffers of other crash situations as well - it's just not stable for a daily use at work (I am HW/SW developer in the STB field and use it for all sorts of tests and stuff).

[BoDan]

In my case codec info sys:
MPEG-1/2 Video (mpgv)
probably different then (no txt here with 2.0...
i do SW developpement and use vlc embedded in a specific application receiving tv and cam streams..

[McLion]

2.1.1 still crashing on TXT.

[Rémi Denis-Courmont]

Bugs don't magically vanish. Until someone supplies a patch, the bug will remain. So patch still welcome.

[BoDan]

Would really be great if someone does the magic
and take on the issues about the interface of libvcl.dll (see also libvlc_audio_set_volume)

I might even consider to do another donation, since i like freaky cones anyway

[spider58]

2.2.0 still crashing on teletext

[Jean-Baptiste Kempf]

Please share a backtrace of the crash.

[spider58]

Please share a backtrace of the crash.

hello.

i am getting error message which below

Code: Select all

An unhandled exception of type "System.AccesviolationException" occured in Libvlctest.exe Addional Information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt

at this line

Code: Select all

libvlc.libvlc_video_get_teletext(Player_Handle) libvlc.libvlc_video_set_teletext(Player_Handle, value) <------------------ THİS line occurs above error libvlc.libvlc_toggle_teletext(Player_Handle)

im sending player_handle and page number to function

same page showing good in VLC.exe

[spider58]

Please share a backtrace of the crash.

do you have any idea?

[Jean-Baptiste Kempf]

This is not a backtrace. Use gdb.