I'm currently have checked it with the Qt 5.5 and have no this
problem... So, the regression was introduced in Qt 5.6...
So, Qt-developers, do you checks your code of QtMultimedia on
regressions when you accept a patches, and before releasing? I do not
understand, how is it possible to introduce this epic regression??? How
is it possible to work for a salary and to make such bugs (and, please
do not say that it is open source)?
27.04.2016 16:44, Massimo Callegari via Development пишет:
________________________________
Da: Mitch Curtis <mitch.cur...@qt.io>
A: Massimo Callegari <massimocalleg...@yahoo.it>; "development@qt-project.org"
<development@qt-project.org>
Inviato: Mercoledì 27 Aprile 2016 14:56
Oggetto: RE: [Development] QtMultimedia && QML - hard performance regressions
on Windows
I didn't look at the other bugs, but QTBUG-37004 seems like it would pretty
easy to contribute a fix yourself.
I don't believe it is pretty easy, especially on Linux.
OSX already returns a user friendly list of devices.
Windows cuts the devices names to 31 characters, cause it use APIs coming
directly from the 90s.
Linux is the worst case instead, cause every possible ALSA device is returned,
so if you have 2 sound cards it will return like 20 devices, most of which
don't even work.
I believe users expect to see a list like what KDE/Gnome expose, so 4-5 devices
total.
Plus I should be looking at the pulseaudio implementation as well, which I know
nothing about.
In any case, it would require an internal change of the logic, most likely
breaking backward compatibility, which is not something that I can decide.
Why waste your time and energy being outraged when you could be fixing it?
Seems like a far more effective way of getting things fixed in an open source
project.
Well, I believe reporting an issue is already a contribution to fixing it and while a
"pretty easy" issue would take me 1 hour to be fixed, the overall effort to get
it approved would be 100 hours. I already went through the process for a QtSerialPort
method, and it was a hell of a journey. Especially working with Gerrit. Please excuse my
limited GIT knowledge :(
As said in the bug report, higher priority issues are being worked on.
Which one ?
And also...since 1-2 years ? Right...
I would rather appreciate much more if the Qt Company could start a sort of "bounty
program", where users can place a few bucks for the resolution of specific issues.
There are more and more examples of this mechanism, like Kickstarter,
Bountysource or even Stackoverflow.
I would be happy to participate to it for the most urgent issues affecting my
projects.
I'm pretty sure there are a lot of open source projects raising donations, and
small companies willing to spend some money on issues that are a priority for
them.
Instead, it seems to me (and it's purely my mere assumption) that big bucks
come from big companies and they have the full attention of the Qt developments.
Attention that don't go to all the rest of minor developers/projects/companies
that are actually the largest user base of the Qt libraries.
If this is really the truth, it is pretty sad. Again, just my opinion.
________________________________
Da: Denis Shienkov <denis.shien...@gmail.com>
A: "development@qt-project.org" <development@qt-project.org>
Inviato: Mercoledì 27 Aprile 2016 11:37
Oggetto: [Development] QtMultimedia && QML - hard performance regressions
on Windows
Hi developers.
I faced with a big problem with the video playback performance, when I
try to open the mp4 video file from any of QML video examples. I have a
high CPU loading (~40%) and the video is freezing and jerks. But the C++
media player works satisfactory, more or less tolerably (on point 3 from
the 1-5 points)...
It is impossible to use at all in QML, I face more and more with the
surprises of QtMultimedia, and disappointed more and more...
WTF ? What sense in QtMultimedia if it does not work as expected?
PS: I have created a bug: https://bugreports.qt.io/browse/QTBUG-53019
BR,
Denis
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