[Development] New Qt Multimedia

Samuel Gaist samuel.gaist at idiap.ch
Thu May 27 14:50:53 CEST 2021

> On 27 May 2021, at 14:35, Lars Knoll <lars.knoll at qt.io> wrote:
>> On 27 May 2021, at 14:25, Eike Hein <hein at kde.org> wrote:
>> May 27, 2021 8:14 AM, "Lars Knoll" <lars.knoll at qt.io> wrote:
>>> The one thing I want to avoid is what we had in Qt 5, where you could force Qt MM to use a
>>> different/custom gstreamer pipeline based on environment variables. That part made maintaining the
>>> code base extremely hard. Other than that I’m of course open for patches and improvements. If some
>>> integration points are needed, we can discuss those separately, but unless they are trivial, they
>>> will probably need to wait until after 6.2.
>> Hmm - does that mean the `gst-pipeline:` URL scheme for `setMedia`/the `source`
>> prop is getting dropped as well?
> That’s correct. It’s has honestly been a huge cludge, and something we didn’t have anywhere else. I’d rather see that we fix issues inside Qt MM instead of working around them with hacks such as this one.
>> If memory serves right, this was possible accidentally at some point and then
>> was raised to the status of Official Footgun in 5.12+:
>> https://doc.qt.io/qt-5/qmediaplayer.html#setMedia
> Footgun is probably the right name for it, and a reason I don’t want to continue with it for Qt 6.
>> A potential troublemaker for sure, but also very powerful. With QtGStreamer
>> being deprecated (an old set of Qt bindings to GStreamer API - also something
>> at least one KDE app I'm aware of still carries an internal fork of, sadly),
>> a QtMM w/ custom pipeline support sort of the next best thing.
> Lets rather have a look at the use cases that people want to have supported and how we can get those working.
> Cheers,
> Lars
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I think one of the main use case I have seen for custom GStreamer pipelines is to be able to get rtsp or other network streams in Qt applications.

Best regards


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