We are able to play hw accelerated local video under the Qt5 multimedia
qmlvideo example and believe that it is using Gstreamer as well.
Looking for a way to do the same under Webkit. Any connections between
the two on video playback?
Regards,
Bin
On 9/23/2014 12:02 PM, Carlos Rafael Giani wrote:
This is because by default, WebKit will use GStreamer for decoding
(and therefore automatically use hw accelerated decoding if an
appropriate plugin is installed), but will copy the decoded pixels
with the CPU. Efficient transmitting of decoded frames to the display
is just as important as hw accelerated decoding, if not more. Yet,
many people only care about the decoding part. On embedded platforms
like the imx6, this means that zerocopy must be enforced, that is,
ensure that _no_ copies of frames are made with the CPU. If copies are
necessary, they must be done by using DMA transfers only.
With stock WebKit, you can pretty much forget about that. Look at this
source:
https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/graphics/gstreamer/VideoSinkGStreamer.cpp#L138
note how it copies pixels with the CPU.
There is apparently a GL-based alternative, but I haven't seen it in
action yet. Also, if TEXTURE_MAPPER_GL implies Desktop OpenGL (without
being able to choose OpenGL ES instead), it means it will use the
wrong API for embedded devices (*never* use the regular OpenGL, since
it is made for desktops - use OpenGL ES instead). With OpenGL ES,
there is a Vivante GPU specific extension that allows for zerocopy.
But this has to be integrated into WebKit, which is probably rather
difficult.
On 2014-09-23 20:55, Bin Lin wrote:
Hi Richard,
We tried to get the HTML5 playback working with Qt5.2.1 webkit on
daisy branch. It hangs when it is trying to play. We tried it on
both the youtubeview example of Qt5 webkitqml and the browser example
of webkitwidgets, eglfs setup. The results are the same.
What are the steps you followed to make the HTML5 at least to play
under webkit?
Regards,
Bin
On 9/23/2014 11:33 AM, Gerard Bucas wrote:
Hi Richard
We have trying EXACTLY the same thing & although we see a slight
improvement on the latest beta BSP, I agree with your conclusion.
This is a serious problem for practical applications of the I.MX6 -
any application that requires HTML5 playback or a browser in general.
See the thread to this list that I started yesterday:
Re: [meta-freescale] Any hope of vblank-synchronized rendering (from
vivante) on i.MX6 soon?
Glad we have yet another concerned user!! 😃
Regards
Gerard Bucas
On 23 Sep 2014, at 14:13, Richard Cochran
<[email protected]> wrote:
Dear list,
I have been trying to get hardware accelerated html5 video working on
the imx6 for a some time now. After trying 'daisy' and also the more
recent alpha and beta branches, I have come to the conclusion that
this does not work (and never has). Looking at the webkit source and
also googling around only confirm my suspicions.
Does anyone out there have this working?
Thanks,
Richard
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