I am sending the unit back to amazon for a refund. I guess the whole market of these android boxes is f***ed up.
I suggest to try it one more time with fresh install. I don't own this box but had situation when my box didn't boot. What I did:
- removed all partitions from SD card and created new fat32 partition and formatted the card with quick format
- installed libreelec with Rufus
Give it a try. If it won't work send back the box a take one that is confirmed 100% working.
amlogic is just another word for imperfection
True.
You are very, very sensitive.
A friend of mine is like You - his eyes are better than an electron microskope
Yes, I am aware of my disroder 
My brain just can't stand any imperfections in some matters
Typically stuttering can appear at the begin of movie or at font changes (italics).
And this is exactly where stutterings appear. With the difference that it's not only on S912 but S905X too.
Option: configure subtitle settings to default until kodi developer fixed it in leia
Tested with default subtitles settings and the problem persists.
Some of you won't notice it at all. I've found only couple of files where it can be seen. Other videos play OK and even when there are stutters they are unnoticeable during watching.
Hope it will be fixed in final Leia build.
Your issue has nothing to do with subtitles rendering. In second LOG2 are 6 frame skips after ~500ms lost of playback control.
In the second log I've played the file couple of times so it's messy.
I will make a third log, this time using the first sample from Star Trek and will enable all components.
Something causes these stutters because exactly the same samples or any other video files without subs are playing like a charm.
OK. Two logs again using this sample
LOG1: there was 1 visible stutter - Ubuntu Pastebin
LOG2: sample played stutter free - Ubuntu Pastebin
Maybe there will be some differences between the two that will allow to identify the issue.
Last build that was free from this was kszaqs Jarvis-7.0.3.012l
bit4freak The issue was not resolved in Krypton and will probably never be. Kodi developers no longer update Krypton and I doubt any of us has knowledge to backport huge Leia changes.
No one expects fixes in Krypton. Bad news it's still in Leia. It occurs less frequently but it's still there.
The 2 of my samples and logs are coming from newest Leia build.
SAMPLE 2 - 70a1jpifn105tupg4homm88zcph8v2tx
LOG: Ubuntu Pastebin
LOG2: Ubuntu Pastebin
This sample is tricky because it can play flawlessly couple of times but eventually it will stutter in the moment the test subs show on the screen.
test platform: TX5 PRO S905X, LibreELEC-S905.arm-8.90.1 running from SD Card.
This bug is present in all Krypton builds for Amlogic chips.
It seems like early builds of Leia have it as well.
I will share another sample and log later. This time standard h264 video where the stuttering is even more visible.
Display MoreJust to answer, Tested using Tx3 and X96 box, both have S905X with 1GB ram. We always play movies with subs, and no stuttering.
1. Yes, played the sample more than once, no stuttering
2. Yes, Refresh rate adjustment turned on
3. No
4. I only use Default font and skin, no changes on the settings
5. Copied your file to my NAS and played it via Wireless
Thanks for letting know. Last thing I didn't check is wireless. Worth checking. I'd be surprised if it was network bug though.
Sorry I am wasting time with you. I am answering only serious bug reporting. And if my suggestion make no sense you have to help yourself.
Dude, what suggestion? This one? (pics). That does make no sense if you say HW decoder is off and I know for sure it's on.
It's ON. ALWAYS ON.
What unserious is about it?
Why would I turn off HW decoding?
I bought this box for HW decoding.
This bug has been reported by some users. It has nothing to do with h265. Subs causes stuttering with h264 as well.
I am serious. Verify your playback by OSD debug log (CTRL-SHIFT-O) of OSD info (key O ). For sw decoding there will be ff-hevc for HW decoding am-h265. Also you can see # drops and skips (only for HW decoding). In your log totally missing AMLCodec logs.
That makes no sense. Have you seen my video where you can see that HW decoding is ON?
I can't read logs. Maybe I've posted wrong log?
This one was in .kodi/temp
There are some zipped files in the
Logfiles folder
You have to enable Amlogic HW acceleration!
Settings->Player->Videos->Allow hardware acceleration-amcodec.
No, really. Lets be serious about this. I'm not that stupid to turn HW acceleration off. Is that what my log says?
It's on.
I told you it does play stutter free from time to time. Give it anothet try. Watch something different and then watch the sample again.
Here is the video ive made with a phone. Quality is awful but you cen clearly see the stutter and video settings.
just tested your sample.mkv, on s905x running 8.90.1 (internal) and 8.2.2.3 (sd) and there is no stutter.
Did you run the sample more than once from beginning to an end without backwards rewinding?
Are you playing the sample in 24p mode?
Do you have enabled any motion enhancement in TV settings?
What kind of font do you use to view subtitles in Kodi and what size?
What do you use to play videos? Is it external HDD, LAN, NAS?
I'm playing it via LAN.
I will make a video of my TV later playing the sample.
Pls, publish kodi debug log with component specific debug: video and a/v timing. Also video sample we'll be welcome.
Here's the sample file and log. I've run it twice and the stutter is visible in the "My name is Captain James Teberius Kirk" moment
There is a 1 in 15 times chance that the file will play stutter free. It's very random and mostly fresh after restart or changing something in the playback settings.
To reproduce just play the file on default settings with enabled Adjust Display Refresh Rate. Stop and play it again. If you don't stop the file and just rewind it to the begining it will play stutter free.
I also have S905X and see the stutters very often. It would be great if stuttering appear only once at the beginning but it stutters also when italic subs are displayed. And then once again when regular and so over and over again.
Mostly they're micro stutters, barely visible and sometime they're more noticeable.
Kszaq said it will be fixed in Leia.
The bug is still present in adamg 8.90.1 which is Leia but it's in alpha stage.
If not... well, there's still flawless Jarvis build.
I can confirm that the issue has resolved for the S905X.
In which build exactly? I'd like to test it.
LE goes crazy playing this file
s01e01_fast.and.furry-ous.avi - file on EasyPaste.org
Totally out of sync and can't be synced. Switches to bad refresh rate.
Did work in past builds. Can't remember which one. Didn't test this file very long time.
Is it possible to set fixed 50 or 60 Hz at startup? Every time the system boots it looks for the refresh rate before the menu shows up. Tried all modes in settings (50, 59,9 and 60 Hz). That would speed up booting another few seconds.
One of my TV switches quite fast but the other one does it really long.
