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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