[vlc-devel] commit: FIX: DSHOW "none" device open (#2201). Some cleaning (basos g )

xxcv xxcv07 at gmail.com
Thu Mar 19 11:24:10 CET 2009

basos g wrote:
> 2009/3/18 xxcv <xxcv07 at gmail.com>:
>> xxcv wrote:
>>> Hello,
>>> I just noticed there's something wrong with my build currently,
>>> when I test the NB today from buildbot it doesn't crash.
>>> This issue might be caused by qt 4.5.0 which I'm experimenting
>>> with vlc-1.0.0-git.
>>> [0xc4c3384] dshow demux error: no video capture device was detected
>>> [0xc4c3384] dshow demux error: can't open video device
>>> ---
>>> Crashed here...
>>> ---
>>> QObject::killTimers: timers cannot be stopped from another thread
>>> ^^^ noticed this
>>> So, I'm in the process of switching back to qt 4.4.3 and retest.
>>> Regards.
>>>> basos g wrote:
>>>>> Sorry, you are not helping me. I would like to understand the state of
>>>>> dshow plugin. For example is an audio device opened ? If not then
>>>>> Common Close will be called else it will print just an error for video
>>>>> and start capturing audio. And this might lead to clues about what is
>>>>> deallocated ..
>>>>> Anyway i might found something about the destruction order (i don't
>>>>> think there is race condition. CoInitialize is an atomic operation).
>>>>>  Could you please try with the attached patch ?
>> Once again my retests concludes my vlc-dshow issue isn't related to
>> updating to Qt4.5.0.
>> Anyways, FYI, I'm using gcc-3 to build vlc.
>> However the race condition, heap free bug is still in the dshow.cpp code.
>> (Introduced in the commit by your patch
>> [576844b24d53c39bdc524af235095ed7939e91fd])
>> I recommend someone to look at the code, and fix up some
>> ancient mistakes, like missing parameter for an interaction
>> function, which lived through the dark ages of invisibility been
>> pass through developer's very eyes six times..., while been through some
>> very useless commits like removing trailing spaces and tabs.
>> One way to find it is, to use a Windows XP machine with VIVO and
>> put vlc to run inside GDB and under qt4, Open Capture dialog, might
>> trigger this bug.
>> Conclusion:
>> Below is attached debugging log file and result is from running
>> NB buildbot's binary, on a Windows XP machine with VIVO.
> I'm confused. You said that this is a vista issue. Now are you saying
> that the crash exists also in XP ?
> Please attach a full debug log (vlc -v2).
> And what is a VIVO exactly? Should i have special hardware to be able to check ?
> In my system (XPSP3) with a sweex usb video camera and a bt73 capture
> device this bug is not observed.
> What are do you talk about saying "like missing parameter for an interaction
> function" ?
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I don't want to explain it again it seems a little bit complicated ... Sorry
that I confused you.
Just waiting for my patches to be reviewed, then you'll know why.


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