[Interest] Getting QImages into QMediaRecoder to create video files (e.g. avi, mp4, or animated gif)?

[Phil Weinstein]

Unfortunately, Qt commercial license support folks are confirming that, 
currently (as of Qt 5.6), there is no way to get a sequence of 
programmatically generated QImages (e.g. renders from an application 
QWidget) into the QMediaRecorder class.  ("There is no API for that").

Related -- they also could not offer any information about a Google WebM 
/ VP8 solution.  That really looks like a promising approach, though the 
integration is technically challenging.  As far as I can tell, that 
really is the only virtually bullet-proof legal approach to generating 
synthetic videos (i.e. animations generated programmatically, saved as 
video files).  http://www.webmproject.org/about/

- Phil

On 1/24/2016 11:50 AM, Phil Weinstein wrote:
> Relative to this topic, "*Video file generation from Qt application,* 
> other than FFmpeg" (on this "interest" e-mail list, in the wrong 
> place, and also thread: 
> https://forum.qt.io/topic/63105/video-file-generation-from-qt-application-other-than-ffmpeg) 
> there's been suggestions in related Qt forums, possibly referring to 
> the *Qt5 QMediaRecorder class,* that video file generation can be done 
> in "just" Qt.
>
> In the Qt5 documentation, there is just a little information about 
> using *QCamera* in conjunction with QMediaRecorder to create video 
> files ("record video to disk") ...
>
>   * http://doc.qt.io/qt-5/videooverview.html#recording-video
>   * http://doc.qt.io/qt-5/cameraoverview.html#movies
>
> However,*I'm not seeing any way to get QImages or QPixmaps into either 
> of these classes (QCamera or QMediaRecorder), nor their base 
> classes.*  So I don't see how these can be used to generate video 
> files from synthetic (program-created) images.  (Ultimately, the frame 
> images would come from "rendering" our QWidgets to QPixmaps or QImages).
>
> Also, there doesn't seem to be any information about whether anything 
> special has to be done with respect to *video codecs* for creating 
> video files (e.g. avi, mp4, or animated gif).  I'd like to give it a 
> try, but that's not doable (nor meaningful) if we can't get QImages 
> and QPixmaps into these Qt5 video-handling classes.
> --- 

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