Joger,
I could only get back to this now.
Trying to build Qt with FFmpeg. As a start point I’m point to prebuilt
libraries by brew:
./configure -prefix /Users/nsantos/Qt/6.8.0/macos_static_vs -static
-debug-and-release -- -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64"
-DFFMPEG_DIR=/opt/homebrew/Cellar/ffmpeg/7.1/lib
Which has:
-r--r--r-- 1 nsantos admin 10232192 9 Out 16:07 libavcodec.61.19.100.dylib
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavcodec.61.dylib ->
libavcodec.61.19.100.dylib
-r--r--r-- 1 nsantos admin 14165144 30 Set 00:31 libavcodec.a
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavcodec.dylib ->
libavcodec.61.19.100.dylib
-r--r--r-- 1 nsantos admin 206528 9 Out 16:07 libavdevice.61.3.100.dylib
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavdevice.61.dylib ->
libavdevice.61.3.100.dylib
-r--r--r-- 1 nsantos admin 90232 30 Set 00:31 libavdevice.a
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavdevice.dylib ->
libavdevice.61.3.100.dylib
-r--r--r-- 1 nsantos admin 3144864 9 Out 16:07 libavfilter.10.4.100.dylib
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavfilter.10.dylib ->
libavfilter.10.4.100.dylib
-r--r--r-- 1 nsantos admin 5098240 30 Set 00:31 libavfilter.a
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavfilter.dylib ->
libavfilter.10.4.100.dylib
-r--r--r-- 1 nsantos admin 2347712 9 Out 16:07 libavformat.61.7.100.dylib
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavformat.61.dylib ->
libavformat.61.7.100.dylib
-r--r--r-- 1 nsantos admin 4220096 30 Set 00:31 libavformat.a
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libavformat.dylib ->
libavformat.61.7.100.dylib
-r--r--r-- 1 nsantos admin 643248 9 Out 16:07 libavutil.59.39.100.dylib
lrwxr-xr-x 1 nsantos admin 25 30 Set 00:31 libavutil.59.dylib ->
libavutil.59.39.100.dylib
-r--r--r-- 1 nsantos admin 885096 30 Set 00:31 libavutil.a
lrwxr-xr-x 1 nsantos admin 25 30 Set 00:31 libavutil.dylib ->
libavutil.59.39.100.dylib
-r--r--r-- 1 nsantos admin 85872 9 Out 16:07 libpostproc.58.3.100.dylib
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libpostproc.58.dylib ->
libpostproc.58.3.100.dylib
-r--r--r-- 1 nsantos admin 31880 30 Set 00:31 libpostproc.a
lrwxr-xr-x 1 nsantos admin 26 30 Set 00:31 libpostproc.dylib ->
libpostproc.58.3.100.dylib
-r--r--r-- 1 nsantos admin 122096 9 Out 16:07 libswresample.5.3.100.dylib
lrwxr-xr-x 1 nsantos admin 27 30 Set 00:31 libswresample.5.dylib ->
libswresample.5.3.100.dylib
-r--r--r-- 1 nsantos admin 115792 30 Set 00:31 libswresample.a
lrwxr-xr-x 1 nsantos admin 27 30 Set 00:31 libswresample.dylib ->
libswresample.5.3.100.dylib
-r--r--r-- 1 nsantos admin 453536 9 Out 16:07 libswscale.8.3.100.dylib
lrwxr-xr-x 1 nsantos admin 24 30 Set 00:31 libswscale.8.dylib ->
libswscale.8.3.100.dylib
-r--r--r-- 1 nsantos admin 547472 30 Set 00:31 libswscale.a
lrwxr-xr-x 1 nsantos admin 24 30 Set 00:31 libswscale.dylib ->
libswscale.8.3.100.dylib
But the pre build summary says:
src git:(v6.8.0) ✗ cat /Users/nsantos/Qt/6.8.0/src/config.summary | grep FF
TIFF ................................... yes
FFmpeg ............................... no
FFmpeg plugin features:
Any ideas on why it failed to include FFmpeg?
How can I debug this?
Thanks!
Nuno
> On 15 Oct 2024, at 12:31, Jøger Hansegård <joger.hanseg...@qt.io> wrote:
>
> Hi Nuno,
>
> I'm glad it helped.
>
> Yes, you can still link Qt Multimedia against a static build of FFmpeg. When
> doing so, omit -DQT_DEPLOY_FFMPEG=ON when configuring Qt.
>
> You can find details about why we recommend using the FFmpeg media backend at
> https://doc.qt.io/qt-6/qtmultimedia-index.html. In short, newer features are
> only implemented with the FFmpeg media backend, and we will only fix critical
> bugs on native backends. With critical bugs, we mean bugs that affect
> security and reliability (crashes/hangs), not performance or functionality
> bugs. We still welcome community contributions on the native backends. The
> native Android backend is already deprecated and will be removed with the
> next major Qt release. An example of a non-critical bug on Windows with the
> native backend is that QMediaPlayer does not support "zero-copy" transfer of
> textures from decoding to display. This can lead to frame drop when playing
> high-resolution video.
>
> The FFmpeg media backend is, therefore, the most future-proof choice for new
> projects.
>
> Thanks,
> Jøger
>
> -----Original Message-----
> From: Nuno Santos <nuno.san...@imaginando.pt>
> Sent: Tuesday, October 15, 2024 12:31 PM
> To: Jøger Hansegård <joger.hanseg...@qt.io>
> Cc: interestqt-project. org <interest@qt-project.org>
> Subject: Re: [Interest] Qt 6.8.0 - FFMPEG on Windows - Is it possible?
>
> Joger,
>
> Thanks for your reply.
>
> It seems that I have failed this little detail:
>
> -DQT_DEPLOY_FFMPEG=ON
>
> Also, is it possible to statically link ffmpeg to Qt? Or will we always need
> to have the dlls somewhere?
>
> One thing that I still couldn't figure out is what are the main advantages of
> using ffmpeg as backend compared with the native backends?
>
> Thank you!
>
> Best,
>
> Nuno
>
>> On 14 Oct 2024, at 17:42, Jøger Hansegård <joger.hanseg...@qt.io> wrote:
>>
>> There is also some information in the official Qt documentation; see:
>> https://doc.qt.io/qt-6/qtmultimedia-building-from-source.html
>>
>> Best regards,
>> Jøger Hansegård,
>> The Qt Company
>>
>>
>> -----Original Message-----
>> From: Interest <interest-boun...@qt-project.org> On Behalf Of Jøger
>> Hansegård via Interest
>> Sent: Monday, October 14, 2024 6:21 PM
>> To: Nuno Santos <nuno.san...@imaginando.pt>; interestqt-project. org
>> <interest@qt-project.org>
>> Subject: Re: [Interest] Qt 6.8.0 - FFMPEG on Windows - Is it possible?
>>
>> Hi Nuno,
>>
>> Yes, this is possible, and we are working on improving the documentation on
>> how to do it. In the meantime, this is one way to do it:
>>
>> 1. Download FFmpeg built with shared libraries from one of the links below.
>> 2. After unzipping the FFmpeg binaries to a suitable location, configure Qt:
>>
>> configure.bat <your normal settings> -- -DFFMPEG_DIR=<path to directory
>> containing FFmpeg include/lib/bin folders> -DQT_DEPLOY_FFMPEG=ON
>>
>> Note the double '--' that separates configure arguments from CMake
>> arguments. Once this is done, you can build Qt as usual.
>>
>> Be aware that he FFmpeg version in the link below is a GPL build. If this is
>> not suitable for you, I added a link to my unofficial wiki page that
>> describes different ways to build FFmpeg for Windows. This gives you control
>> over building FFmpeg without any GPL or non-free components. Among the
>> described options, using VCpkg is the simplest.
>>
>> Download links:
>> FFmpeg for Windows (GPL): https://ffmpeg.org/download.html#build-windows
>> (use the ones from BtbN, direct link:
>> https://github.com/BtbN/FFmpeg-Builds/releases). It contains shared
>> libraries and FFmpeg header files.
>> Building FFmpeg:
>> https://wiki.qt.io/User:Joger/Building_Qt_Multimedia_with_FFmpeg
>>
>> Thanks,
>> Jøger
>> The Qt Company
>>
>> -----Original Message-----
>> From: Interest <interest-boun...@qt-project.org> On Behalf Of Nuno Santos
>> via Interest
>> Sent: Monday, October 14, 2024 5:04 PM
>> To: interestqt-project. org <interest@qt-project.org>
>> Subject: [Interest] Qt 6.8.0 - FFMPEG on Windows - Is it possible?
>>
>> Hi,
>>
>> I do I enable FFMPEG backend on Windows?
>>
>> Is it even possible?
>>
>>> configure.bat -help
>>
>> does not have any mention to it.
>>
>> Thanks!
>>
>> Regards,
>>
>> Nuno
>> _______________________________________________
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>> Interest@qt-project.org
>> https://lists.qt-project.org/listinfo/interest
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>
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