[Interest] Chances of usable qtmultimedia on imx6?

[Auslands-KV]

Just as a short update: I got Qt5.3 compiled and running on Yocto. :-)

Video playback is indeed MUCH, MUCH better!!!!

I only have a strange thing: My app no longer works.

It does start the video (which I see due to the gstreamer debug output),
but then doesn't play. Also the whole app seems to stop as even timers
no longer trigger. Very strange. It worked perfectly under 5.2.1.
(except, of course, of the sluggish playback). I guess, I will need to
debug this now and see what is the reason behind that.

Regards

Michael

Am 17.04.2014 11:05, schrieb Christoph Kurz:
>> Auslands-KV <auslands-kv at gmx.de> hat am 16. April 2014 um 10:38
>> geschrieben:
>>
>> Hi Christoph
>>
>> That looks GREAT!!! Need to test that immediately. :-)
>>
>> You know by chance, if 5.3 is available on Yocto?
>>
>> Regards
>>
>> Michael
>>
>>
>> Am 16.04.2014 09:39, schrieb Christoph Kurz:
>>> > Hi
>>> >
>>> >I am looking for a nice small device used mainly for a specialized
>>> >digital signage solution. As software framework I would like to use
>>> Qt5,
>>> >as I really love Qt5 :-)
>>> >
>>> >I had a recent look at the imx6 solutions available, and there are
>>> many
>>> >devices out on the market at attractive price points. The power of the
>>> >CPU and the GPU should be totally sufficient for the use case. So I
>>> >tested Qt5 on it. The results are, however, pretty bad.
>>> >
>>> >While GL effects and shaders work nicely in Qt5.2.1, qtmultimedia is
>>> >extremely inefficient. Here are some examples comparing gstreamer
>>> and Qt5:
>>> >
>>> >1. Playback of HD video (mpeg4):
>>> >Gstreamer: < 10% CPU usage, perfect picture
>>> >Qt5: 100% CPU usage, some frames are dropped, somewhat usable
>>> >
>>> >2. Playback of full HD (FHD) video (h264):
>>> >Gstreamer: < 20% CPU usage, perfect picture
>>> >Qt5: 100% CPU usage, 90% of frames are dropped, unusable
>>> >
>>> >3. Playback of rtsp webcam stream (640x480, h264):
>>> >Gstreamer: < 5% CPU usage, nearly perfect pictures
>>> >Qt5: 5-10% CPU usage (!), but >90% of frames are dropped, unusable
>>> >
>>> >Gstreamer shows that the imx6 is perfectly capable of playing these
>>> >streams. Also, XBMC runs perfectly on it. So. it definitely seems
>>> to be
>>> >a matter of Qt integration with the imx6 platform that is severely
>>> >lacking.
>>> >
>>> >I am just wondering if there is a chance that Qtmultimedia will be
>>> >better integrated into the imx6 platform in the (near) future, or if I
>>> >should better look for a different platform (e.g. bay trail?) ?
>>> >
>>> >Thanks for any comments
>>> >
>>> >Michael
>>>  
>>> Have you tried Qt5.3? It should work there:
>>> https://codereview.qt-project.org/#change,76764
> Sorry, I don't use Yocto, so I don't know...
> But if I had to guess, then I would say the setup should be quite
> similar to 5.2.
>  
> Regards,
> Christoph
>  

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