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WeTek Core (24p HD Netflix / HD Audio / Lollipop / OpenELEC / 4K / HEVC)
(2016-01-15, 13:54)noggin Wrote:
(2016-01-15, 13:29)wrxtasy Wrote: Hmmm,
Noggin, can you try and go into OSD Video settings while DVD ISO is playing and disable de-interlacing completely and save as default ?

Are you getting ff-mpeg2 decoding of these DVD ?

Checked.

When playing a 576/50i DVD ISO I get dc:ff-mpeg2video.

When I disable deinterlacing on native interlaced content I get what looks like full intra-frame combing, but no motion judder (but obviously terrible picture quality) - though with some semblance of 50Hz motion (It's like a worse version of the old deinterlacing bug the Pi had on MMAL advanced). With deinterlacing in Auto, I get the motion judder I mentioned above sporadically. It doesn't appear to be regular.

When I watch native 25p content I don't get motion judder in either mode (and obviously no combing as there is no intra-frame motion on properly transferred 25p content) but with Auto deinterlacing enabled (or forced On) it appears to be far worse in lip-sync terms.
Ahh that explains it, I've been watching 576/25i content only with fast action and see no combing or judder with de-interlacing off.
I'm wondering how optimised ffmpeg is for ARMv7 or CortexA9.

Low bitrate 720p HEVC Software decoding seems to work Ok in brief testing I've done, so maybe it is optimised in ffmpeg 2.8.4

I really don't know enough about Software decoding in Kodi to tell you the truth.

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(2016-01-15, 14:05)wrxtasy Wrote:
(2016-01-15, 13:54)noggin Wrote:
(2016-01-15, 13:29)wrxtasy Wrote: Hmmm,
Noggin, can you try and go into OSD Video settings while DVD ISO is playing and disable de-interlacing completely and save as default ?

Are you getting ff-mpeg2 decoding of these DVD ?

Checked.

When playing a 576/50i DVD ISO I get dc:ff-mpeg2video.

When I disable deinterlacing on native interlaced content I get what looks like full intra-frame combing, but no motion judder (but obviously terrible picture quality) - though with some semblance of 50Hz motion (It's like a worse version of the old deinterlacing bug the Pi had on MMAL advanced). With deinterlacing in Auto, I get the motion judder I mentioned above sporadically. It doesn't appear to be regular.

When I watch native 25p content I don't get motion judder in either mode (and obviously no combing as there is no intra-frame motion on properly transferred 25p content) but with Auto deinterlacing enabled (or forced On) it appears to be far worse in lip-sync terms.
Ahh that explains it, I've been watching 576/25i content only with fast action and see no combing or judder with de-interlacing off.
I'm wondering how optimised ffmpeg is for ARMv7 or CortexA9.

Low bitrate 720p HEVC Software decoding seems to work Ok in brief testing I've done, so maybe it is optimised in ffmpeg 2.8.4

I really don't know enough about Software decoding in Kodi to tell you the truth.

What 576i25 (aka 576/50i) content are you watching? Concert, sports etc.? If it is drama or movie it will be 576p25 (so will have no intra-frame motion) and isn't natively interlaced.

Fast motion will massively show up combing - as there will be massive differences between the two fields in each 576i25 frame - so you will get really visible combing. You won't see it on static or very slow moving content (as there is little motion between the two fields in the interlaced frame). With in-phase (which is almost everything this side of the 70s) 25p content you won't see combing at all.

The Pi 2 can just about do a 576i25 MPEG2 CPU decode (it's what happens without the MPEG2 licence)

The Core looks to be decoding the MPEG2 fine - no obvious frame drops on 25p content. The deinterlace doesn't appear to be happening properly in hardware though. It may well be too much to deinterlace (a YADIF 2x etc.) in software as well. (The Chomebox could just about do the reverse - hardware MPEG2 decode with CPU deinterlace - before VAAPI MCDI/MADI were cracked by fritsch et al.)

Bottom line - AMLogic need to fix their MPEG2 decoder it seems.
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Just working off the Mediainfo of the .vob files.
Black Hawk Down movie DVD ISO and its saying 720x576, 25fps, PAL, Interlaced. Unless its lying and this is actually 25p.

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(2016-01-15, 14:43)wrxtasy Wrote: Just working off the Mediainfo of the .vob files.
Black Hawk Down movie DVD ISO and its saying 720x576, 25fps, PAL, Interlaced. Unless its lying and this is actually 25p.

Aaaaaghhhhh!!!!

I thought you knew the difference between native acquired interlaced and distributed interlaced. Movies are shot on film at 24p (or 25p if shot for a 50Hz market directly). 50Hz DVD releases will usually speed 24p up to 25p and use 2:2 pulldown (i.e. show one frame for 2 fields, then the next frame for 2 fields).

However 50Hz MPEG2 DVDs are often (always?) mastered in 50i. If you master a 25p source in 50i there will obviously be no motion between the two fields in the frame (effectively it is psf) - so you don't actually have to do anything to deinterlace other than present both fields weaved together (this is why you WEAVE 25p content received in a 50i wrapper). Effectively you create a 576 line image by using one 288 field for the odd lines and the next 288 line field for the even lines etc. and show it twice (once per field)

My point is about native interlaced material. This won't be a movie or high-end TV drama (in fact even many soaps now shoot 25p rather than 50i) - it will be entertainment, sport or news.

These sources will have motion between the two fields in a frame (as they are captured 1/50th second apart) - so you need to recreate the missing fields (you can't use the other field as you can for a WEAVE). Bob does this by duplicating (sometimes with a bit of filtering) the same field giving you lower vertical resolution, but 50 images per second with no combing (but jaggies instead). Then you get more and more sophisticated algorithms

However - the major difference between 25p and 50i native content is that 50i native content, when correctly deinterlaced, will have a very different look - it will be fluid 50Hz rather than slightly juddery 25Hz.

Black Hawk Down is a movie. It will have native 25Hz judder (due to only capturing 25 images a second). 50i native content captures 50 pictures a second, so when correctly deinterlaced should have 50Hz motion (which will look a lot more fluid than 25Hz)

ffmpeg won't know that the source is progressive without doing some analysis of the actual image content. The only real way of telling if a source is acquired interlaced or progressive is to watch it.

Obviously if you have Natural Motion, MotionFlow etc. enabled on your TV and it is converting 25p to look like 50i (i.e. the soap opera effect) you can't see the difference as you aren't watching the real video, but a mangled version of it. But if you have all these processes disabled - you will clearly see 25p from 50i content (or should be able to if you have a half-way critical eye)
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As always I'm amazed by your depth of Knowledge. Wink
Thanks for testing.

Native vs Distributed, no I did not know the full depth of it. I'm far from a TV or Broadcast Engineer.

All the DVD ISO Rips I've tried here are movies, that as you say will have no motion between the two fields in the frame.
The point is these mpeg2 .vob ISO rips would not even play properly before and now they do.

Playback seems smooth enough to me with all motion processing turned off on the TV, so that is all I was looking for.

I have no native mpeg2 50i content sourced from DVD's obviously.

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(2016-01-15, 15:57)wrxtasy Wrote: As always I'm amazed by your depth of Knowledge. Wink
Thanks for testing.

Native vs Distributed, no I did not know the full depth of it. I'm far from a TV or Broadcast Engineer.

Ah - thought the difference between interlaced native and progressive carried as interlaced was a given. It's the same for 576/50i TV carrying 25p vs 50i content. If we didn't have to worry about 50i native content we wouldn't really have to worry about deinterlacing at all otherwise. (We'd just weave)

Quote:All the DVD ISO Rips I've tried here are movies, that as you say will have no motion between the two fields in the frame.
The point is these mpeg2 .vob ISO rips would not even play properly before and now they do.
Yep - but absolutely no deinterlacing required. 25p content in 50i can be weaved, which is kind of the default action when you don't deinterlace at all.
Quote:Playback seems smooth enough to me with all motion processing turned off on the TV, so that is all I was looking for.

I have no native mpeg2 50i content sourced from DVD's obviously.

Pity - there are still real issues with 50i native content.
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How is this thing compared to the shield tv
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Advantage of Wetek Core is that it can run OpenElec as well as Android, so you can do more 'Linuxy' things with it - like running USB DVB tuners and PVR backends etc. It also has experimental 3D MVC support (albeit with half-resolution output similar to HTAB)

nVidia Shield is HDMI 2.0 ([email protected]), has some HD Audio support now, and will give you 4K Netflix (Wetek Core is 1080p Netflix - and one of the few devices that is) nVidia has no 3D, and is Android TV only.
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4 UHD HDR TEST with OpenElec @wrxtasy 3D Build.

Exodus 4K UHD

Basketball 4k UHD

Life Of Pi 4K UHD

None of these 4k UHD files playback on the Wetek Core, try the same files on Roku 4 and everything works fine...
MY CURRENT MEDIA PLAYER | MY HOME THEATER
MINIX NEO U9-H LIBREELEC v18 Leia | EGREAT A10 | NVIDIA SHIELD
SAMSUNG QLED QN75Q7 | Sony 43 Android TV HDR
XBOX ONE X UHD BLU-RAY | PS4 PRO 4K w/PSVR
NAKAMICHI PRO 7.1.4 DTS:X/ATMOS 
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Isn't the Core 8 bit only? 8 bit HDR sounds unlikely...
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Exactly noggin, Core support 8-bit HEVC up to [email protected]
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Ok,so the Core only support 8 Bit Hevc file.
MY CURRENT MEDIA PLAYER | MY HOME THEATER
MINIX NEO U9-H LIBREELEC v18 Leia | EGREAT A10 | NVIDIA SHIELD
SAMSUNG QLED QN75Q7 | Sony 43 Android TV HDR
XBOX ONE X UHD BLU-RAY | PS4 PRO 4K w/PSVR
NAKAMICHI PRO 7.1.4 DTS:X/ATMOS 
Reply
This looks interesting, no guarantees and no idea how well it works:

Android TV OS Launcher for the WeTek Core

http://wetekforums.com/vb5/forum/wetek-c...wetek-core

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Where can someone buy the core nowadays? It seems out of stock in their site.
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Where is the best place to buy one of these units and is the core the best were has to offer?
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