[Development] Provisioning freeze exception for building FFmpeg as shared libraries

[Volker Hilsheimer]

I agree that it’s important to get Beta1 out before summer vacation starts, but we win very little by verifying that we can release the beta of a Qt Multimedia that’s quite different from the Qt Multimedia we actually want to release.

The FFmpeg provisioning changes are localised to Qt Multimedia, and looking at the history of the staging attempts, it’s a bit unclear why things failed. The last attempt failed on Debian-11, the log output is not very conclusive.

+ echo 'Running update for apt'
Running update for apt
+ waitLoop
+ sudo fuser /var/lib/dpkg/lock
+ sudo apt-get update
Reading package lists...
E: Could not get lock /var/lib/apt/lists/lock. It is held by process 953 (packagekitd)
E: Unable to lock directory /var/lib/apt/lists/
E: Problem renaming the file /var/cache/apt/srcpkgcache.bin.TsV3UY to /var/cache/apt/srcpkgcache.bin - rename (2: No such file or directory)
W: You may want to run apt-get update to correct these problems
E: The package cache file is corrupted

Let’s review and agree on the requested exceptions in the release team meeting on Tuesday. Until then, please focus on testing the changes thoroughly to reduce the risk of them eventually merging causing any surprises.

Volker


> On 22 May 2024, at 09:12, Jani Heikkinen via Development <development at qt-project.org> wrote:
> 
> Hi!
> 
> In my opinion we can wait branching & integrate this in 'dev' after it. And pick changes in '6.8' after beta1; it is more important to keep CI & provisioning as stable as possible this close to feature freeze to make sure we can keep FF schedule (and so on Qt 6.8.0 final schedule as well) and get Beta1 out before summer vacations starts...
> 
> br,
> Jani
> 
>> -----Original Message-----
>> From: Development <development-bounces at qt-project.org> On Behalf Of
>> Jøger Hansegård via Development
>> Sent: tiistai 21. toukokuuta 2024 18.53
>> To: development at qt-project.org
>> Subject: [Development] Provisioning freeze exception for building FFmpeg as
>> shared libraries
>> 
>> Hi,
>> 
>> I would like to request a provisioning freeze exception for building FFmpeg as
>> shared libraries.
>> 
>> The goal of this change is to make it easier to transition Qt Multimedia
>> applications from legacy native media backends to the default FFmpeg media
>> backend.
>> 
>> Although the FFmpeg media backend can still be built with static linking to
>> FFmpeg, we will switch to dynamic linking against FFmpeg for binaries
>> deployed by the Qt Online Installer. This is already released for Windows in Qt
>> 6.7 and will be implemented for all platforms in Qt 6.8.
>> 
>> FFmpeg is built as part of provisioning, and the corresponding scripts must
>> therefore be updated to build FFmpeg as shared libraries on the remaining
>> platforms, iOS, Linux, and Android.
>> 
>> * https://bugreports.qt.io/browse/QTBUG-120990
>> * https://bugreports.qt.io/browse/QTBUG-120991
>> * https://bugreports.qt.io/browse/QTBUG-122010
>> 
>> Since the change has implications for application deployment, we depend on
>> getting early feedback on the change, and if possible, as part of beta 1.
>> 
>> Best regards,
>> Jøger Hansegård
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