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Qt-interest Archive, October 2007
a simple video player on qt引用：http://lists.trolltech.com/qt-interest/2007-10/thread00007-0.html
Message 1 in thread
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- Subject: a simple video player on qt
- From: "karmendra jain"
- Date: Mon, 1 Oct 2007 18:23:22 +0530
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Hi All
Can anyone please tell me how to make a video player
ONLY using QT .. such that it will read a raw video(or encoded data)
from a file/buffer and render it on screen of a device which doesnot
has X or open gl or gtk support ???
any small sample will be really helpfull
Thanks
--
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Message 2 in thread
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Em Monday 01 October 2007 14:53:22 karmendra jain escreveu:
> Hi All
> Can anyone please tell me how to make a video player
> ONLY using QT .. such that it will read a raw video(or encoded data)
> from a file/buffer and render it on screen of a device which doesnot
> has X or open gl or gtk support ???
>
> any small sample will be really helpfull
Take a look at the example that is bundled with Qt:
http://doc.trolltech.com/main-snapshot/widgets-movie.html
It's in your source package as examples/widgets/movie
It requires a running output display. If you're using Qt/X11, then it requires
X11. But it won't require OpenGL.
Finally, note that this example is just about showing what you can do with
simple classes. It is not a full-fledged movie player. It will read only what
image-formats Qt knows about -- in a standard build, that will be GIF and
MNG. That's enough for simple animations (like animated icons, progress
information, etc.), but trying to render a 320x240 30fps movie might take its
toll.
If you want more, you'll have to wait for Qt 4.4.
--
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Message 3 in thread
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- Subject: Re: a simple video player on qt
- From: Till Oliver Knoll
- Date: Mon, 01 Oct 2007 15:45:10 +0200
- Delivered-to: qt-interest@trolltech.com
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Thiago Macieira schrieb:
> > ...
> If you want more, you'll have to wait for Qt 4.4.
Hmmm, now I'm curious: I've heard that WebKit will be included, which is
a good thing. So what does the rumour say about the media support in Qt
4.4? Any secrets and insider infos you want to share with us? :)
Cheers, Oliver
--
[ signature omitted ]
Message 4 in thread
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Quoting Till Oliver Knoll :
> Thiago Macieira schrieb:
>>> ...
>> If you want more, you'll have to wait for Qt 4.4.
>
> Hmmm, now I'm curious: I've heard that WebKit will be included, which
> is a good thing. So what does the rumour say about the media support in
> Qt 4.4? Any secrets and insider infos you want to share with us? :)
It's not a secret if you follow the KDE 4.0 development process:
Phonon will be part of Qt 4.4 and KDE 4.0.
You can download the current (development) version from the KDE
Subversion repository (web access:
http://websvn.kde.org/trunk/KDE/kdelibs/phonon/
)
The main website (quite outdated) is
http://phonon.kde.org
and you can
find Phonon's main author in #phonon in FreeNode.
--
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Message 5 in thread
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- Subject: Re: a simple video player on qt
- From: "karmendra jain"
- Date: Mon, 1 Oct 2007 19:50:59 +0530
- Cc:
qt-interest@xxxxxxxxxxxxx
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- To: "Pau Garcia i Quiles"
Can anythin be done in qt 3.3 ????
there was a kiosk /mpeg player kiosk [Qt/Embedded-specific]
An MPEG player.
in lot of places but i never found the code for it ...
can anyone help in this ???
On 10/1/07, Pau Garcia i Quiles wrote:
> Quoting Till Oliver Knoll :
>
> > Thiago Macieira schrieb:
> >>> ...
> >> If you want more, you'll have to wait for Qt 4.4.
> >
> > Hmmm, now I'm curious: I've heard that WebKit will be included, which
> > is a good thing. So what does the rumour say about the media support in
> > Qt 4.4? Any secrets and insider infos you want to share with us? :)
>
> It's not a secret if you follow the KDE 4.0 development process:
> Phonon will be part of Qt 4.4 and KDE 4.0.
>
> You can download the current (development) version from the KDE
> Subversion repository (web access:
>
http://websvn.kde.org/trunk/KDE/kdelibs/phonon/
)
>
> The main website (quite outdated) is
http://phonon.kde.org
and you can
> find Phonon's main author in #phonon in FreeNode.
>
>
> --
> Pau Garcia i Quiles
>
http://www.elpauer.org
> (Due to my workload, I may need 10 days to answer)
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information:
http://lists.trolltech.com/qt-interest/
>
>
--
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Message 6 in thread
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- Subject: Re: a simple video player on qt
- From: "karmendra jain"
- Date: Mon, 1 Oct 2007 19:28:22 +0530
- Cc: "Qt Interest List"
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- To: "Till Oliver Knoll"
Thanks guys
and yes i saw that example .. but its only for gif files and it requires X11 ..
but i'll explain my problem in detail
currently i was tryin to make a player .. back end gstreamer .. front end QT
on a board which doesnot support x11
now backend is ready .. it gives a decoded framer buffer .. which i
can write to a file
now how can i do things in QT ..
Ie use some buffer and display the movie decoded by the gstreamer ???
and on top of this .. i dont have X11 support on that board :(
ne help ppl ??
On 10/1/07, Till Oliver Knoll wrote:
> Thiago Macieira schrieb:
> > > ...
> > If you want more, you'll have to wait for Qt 4.4.
>
> Hmmm, now I'm curious: I've heard that WebKit will be included, which is
> a good thing. So what does the rumour say about the media support in Qt
> 4.4? Any secrets and insider infos you want to share with us? :)
>
> Cheers, Oliver
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information:
http://lists.trolltech.com/qt-interest/
>
>
--
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Message 7 in thread
-->
On 01.10.07 19:28:22, karmendra jain wrote:
> Thanks guys
> and yes i saw that example .. but its only for gif files and it requires X11 ..
> but i'll explain my problem in detail
>
> currently i was tryin to make a player .. back end gstreamer .. front end QT
> on a board which doesnot support x11
> now backend is ready .. it gives a decoded framer buffer .. which i
> can write to a file
>
> now how can i do things in QT ..
> Ie use some buffer and display the movie decoded by the gstreamer ???
> and on top of this .. i dont have X11 support on that board :(
Then you can't run Qt anyway, you can run Qtopia though. Other than that
neither Qt nor Qtopia have any support for decoding video data and
displaying it, so you'd have to write your own decoder and use QPainter
to display the data that you decode.
Andreas
--
[ signature omitted ]
Message 8 in thread
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- Subject: Re: a simple video player on qt
- From: "karmendra jain"
- Date: Mon, 1 Oct 2007 19:55:29 +0530
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Hey yes yesi have written a decoder that decodes the data and provides the decoded framebut how to use painter to get the desired result ???1: where to pass the pointer of the deocded frame2: how to maintain the decoder and the painter in sink ??is there any sample code that can help ???
On 10/1/07, Andreas Pakulat wrote:
> On 01.10.07 19:28:22, karmendra jain wrote:
> > Thanks guys
> > and yes i saw that example .. but its only for gif files and it requires X11 ..
> > but i'll explain my problem in detail
> >
> > currently i was tryin to make a player .. back end gstreamer .. front end QT
> > on a board which doesnot support x11
> > now backend is ready .. it gives a decoded framer buffer .. which i
> > can write to a file
> >
> > now how can i do things in QT ..
> > Ie use some buffer and display the movie decoded by the gstreamer ???
> > and on top of this .. i dont have X11 support on that board :(
>
> Then you can't run Qt anyway, you can run Qtopia though. Other than that
> neither Qt nor Qtopia have any support for decoding video data and
> displaying it, so you'd have to write your own decoder and use QPainter
> to display the data that you decode.
>
> Andreas
>
> --
> Avert misunderstanding by calm, poise, and balance.
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information:
http://lists.trolltech.com/qt-interest/
>
>
--
[ signature omitted ]
Message 9 in thread
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- Subject: Re: a simple video player on qt
- From: Justin Noel
- Date: Mon, 01 Oct 2007 10:56:37 -0400
- Delivered-to: qt-interest@trolltech.com
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- To: QtList
QPainter has a method called drawImage. You can do something like the following in a subclass of QWidget:
void VideoWidget::paintEvent()
{
//Get the current frame and size data...
//Passing QImage
QImage frame(frameDataUCharPtr, frameWidth, frameHeight.
QImage::Format_RBG32 );
QPainter painter(this);
painter.drawImage(rect(), frame);
}
Under Qtopia you can use QDirectPainter to write directly to framebuffer
memory and get some faster access for drawing frames. You will have to
do the color conversions yourself to get the frame into your
framebuffer's color model.
--Justin
karmendra jain wrote:
> Hey yes yes
> i have written a decoder that decodes the data and provides the decoded frame
> but how to use painter to get the desired result ???
> 1: where to pass the pointer of the deocded frame
> 2: how to maintain the decoder and the painter in sink ??
>
> is there any sample code that can help ???
>
> On 10/1/07, Andreas Pakulat wrote:
>
>> On 01.10.07 19:28:22, karmendra jain wrote:
>>
>>> Thanks guys
>>> and yes i saw that example .. but its only for gif files and it requires X11 ..
>>> but i'll explain my problem in detail
>>>
>>> currently i was tryin to make a player .. back end gstreamer .. front end QT
>>> on a board which doesnot support x11
>>> now backend is ready .. it gives a decoded framer buffer .. which i
>>> can write to a file
>>>
>>> now how can i do things in QT ..
>>> Ie use some buffer and display the movie decoded by the gstreamer ???
>>> and on top of this .. i dont have X11 support on that board :(
>>>
>> Then you can't run Qt anyway, you can run Qtopia though. Other than that
>> neither Qt nor Qtopia have any support for decoding video data and
>> displaying it, so you'd have to write your own decoder and use QPainter
>> to display the data that you decode.
>>
>> Andreas
>>
>> --
>> Avert misunderstanding by calm, poise, and balance.
>>
>> --
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
>> List archive and information:
http://lists.trolltech.com/qt-interest/
>>
>>
>>
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information:
http://lists.trolltech.com/qt-interest/
>
begin:vcard
begin:vcard
fn:Justin Noel
n:Noel;Justin
org:ICS;Engineering
adr:;;54B Middlesex Trpk;Bedford;MA;01730;USA
email;internet:justin@xxxxxxx
title:Sr. Consulting Engineer / Certified Qt Instructor
tel;work:(617) 621-0060
url:
http://www.ics.com
version:2.1
end:vcard
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