[mythtv-users] Heh - will be nice to have such FE - isn't?

Xander Victory lexvictory at yahoo.com.au
Wed Jun 12 14:24:12 UTC 2013


On 11/06/2013 10:11 PM, Jeff Siddall wrote:
> On 06/11/2013 10:00 AM, Joseph Fry wrote:
>>
>>             This device is actually very good.
>>             The API for h264/mpeg decode is the v4l2 API in linux. It
>>             looks like Samsung
>>             supplied patches and drove some of the changes for v4l2.
>>             Theres a git repo
>> http://git.infradead.org/__users/kmpark/public-apps/tree/__HEAD:/v4l2-mfc-example
>> <http://git.infradead.org/users/kmpark/public-apps/tree/HEAD:/v4l2-mfc-example>
>>             that provides a sample program showing how to use the v4l2
>>             api for decoding!
>>
>>             If this was build in to MythTV then I think it would make a
>>             very nice
>>             frontend.
>>             Of course you'd have to consider the deinterlacing, but a
>>             quad core
>>             1.7GHz should be
>>             capable, right.
>>
>>
>>         Quad core ARM?  Umm... not likely.  ARM != i7
>>
>>
>>     For deinterlacing? the decode will be HW accelerated.
>>
>>
>> Depends upon the deinterlacing used. Assuming that you can use the CPU
>> to deinterlace a GPU decoded video (not sure it it will even let you do
>> that), you would have a range of deinterlacers to choose from.
>>
>> Simple deinterlacers like One Field, or Bob, use minimal CPU... they do
>> little processing of the frames.  Advanced deinterlacers actually detect
>> motion in the frames and manipulate the fields to make each frame appear
>> as close to complete as possible.  The motion detection, and
>> manipulation of the feilds can be VERY cpu intensive when your
>> deinterlacing HD video in realtime.
>
> Correct.  I was expressing concern with the ability of an ARM to do 
> advanced deinterlacing.
>

For the record, hardware decoding on these is not GPU based. The MFC is 
a specialised arm core unrelated to MALI.
I have one of the X model, they're quite nice, but very DIY - for 
backend purposes one must note that if the power is lost it will not 
retain the time (without an added battery backed rtc chip).



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