Re: 回复： low performance of gst plugin "androidmedia" with hardware decoder

[Andoni Morales]

2013/9/4 jojo <rjiejie at gmail.com>

>  Hi,
>
> Yes, i am sure the androidmedia plugin is working in my testing,
>
> but i make a mistake, i am testing again in 1080P case, the CS(NV12 ->
> RGBx) operation
>
> costs about 70ms average time per frame …. it is too much, i use the
> ffmpegcolorspace plugin to do that, it's the limit of performance in my
> case  :(
>
> is there acceleration API about for CS operation in android ? or how to
> use the YUV format bitmap to display ?
>
> i think about this function is a standard module in HW/chip.
>

Most colorspace operations are handled by liborc, and it might be possible
that since we don't build for neon it's taking a slower path.

Cheers,
Andoni

>
> Thanks,
>
> - Jojo
>
> 在 2013年8月30日星期五，下午3:37，Sebastian Dröge 写道：
>
> On Do, 2013-08-29 at 16:10 +0800, jojo wrote:
>
> Hi,
> I use plugin "androidmedia" to decode video in android platform with
> AVC HW decoder,
>
>
> my device is: IMX6Q-SDB
>
>
> my pipe line is:
>
>
> video pipeline: appsrc is-live=true do-timestamp=true
> caps="video/x-h264, width=1920, height=800" name="appsrc" !
> decodebin2 ! queue ! ffmpegcolorspace ! appsink caps="video/x-raw-rgb,
> bpp = (int) 32, depth = (int) 24, endianness = (int) BIG_ENDIAN,
> red_mask = (int) 0xFF000000, green_mask = (int) 0x00FF0000, blue_mask
> = (int) 0x0000FF00, width = (int) [ 1, max ], height = (int) [ 1, max
> ], framerate = (fraction) [ 0, max ]" name="appsink"
>
>
>
>
> I collect time in "GstAppSinkCallbacks.new_buffer",
>
>
> in 1080P at 30FPS local case,
>
>
> the average decoding time is 50 ms,
>
>
> if i remove the plugin "ffmpegcolorspace" from pipe line, it costs
> about 47 ms also, why ?
>
>
> i think the CS convert operation should take much more then 2 ms….
>
> someone have performance data for this plugin ?
>
>
> and what's the best configuration about for this plugin ?
>
>
> Do some profiling to see which step exactly takes so much time. Also how
> do you measure this 50ms/47ms? Having the color format conversion to RGB
> take just 3ms compared to everything else seems quite low.
>
> Are you sure that the androidmedia plugin is actually used in decodebin
> here? If it is, another step that can take some time is that it
> currently copies every frame once... but if the color format conversion
> just need 3ms, the copying should take even less than that.
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>
>
>
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>


-- 
Andoni Morales Alastruey

LongoMatch:The Digital Coach
http://www.longomatch.ylatuya.es
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