Dolby Vision for Minix U22X-J (Max) and Ugoos AM6+

Development Development & Testing
2316

TLDR: CMv4.0 bug

Hey all - quick question.

I just received my AM6B + yesterday with the n firmware installed from the factory.

I installed the CoreELEC-Amlogic-ng.arm-21.1-Omega_nightly_20240804-Generic.img.gz without incident, utilizing dual boot, and was able to install the updated plexmod, etc etc.

All appears to be well. Everything appears to play just fine, dolby vision p7 MEL/FEL files (other profiles too) - it triggers DV on my Sony A80J OLED.

The only weird thing I’ve noticed is the following: I downloaded a ton of test files to test out the different capabilities of the DV engine. The only one that is giving me trouble are the CMv4.0 mks/mp4s. Every CMv2.9 files I test (the ones with the red screen), all the trims appear to work.

However, with multiple CMv4.0 files I’ve tried, the 4.0 trims never appear to actually work on the first try. Meaning, I can only get the trim layer to show “CMv4.0 working” whenever I skip around the video file (usually they are 60s long). if I rewind the video 10 seconds, this can sometimes cause the 4.0 trim to appear; but again,if I play video from the beginning, it will only show the 2.9 trim red screen. This is the same whether I hook up the Ugoos directly to my TV, or using my Q990c receiver to passthrough the video (which it also does just fine). So whether it’s direct to the TV or passthrough’d the receiver, the output is still the same.

My Ugoos is in TV-LED mode.

Any idea why this is the case? i know 4.0 files are rare and only used for streaming mainly (I bought this device for remux p7 BL + EL capability) - but it’s still kind of bothering me when I’ve heard this device can properly decode 4.0 files. Which again, it clearly CAN - since I can trigger the trim to decode by skipping around the test file; but it never works when I just hit play. By the way, I’m just playing this video files directly off the “files” part of Kodi in CoreElec, connected to my Windows over Wi-Fi via SMB.

I doubt it’s the Wi-Fi though - I played A Quiet Place 2160p remux FEL and that played beautifully, and properly passthrough’d the TrueHD + Atmos to my surround sound.

2317

Do you use TV-Led mode?

2319

yeah, my TV supports TV-LED since it’s a high-end OLED panel. the player-led toggle is disabled

2320

you’re probably talking about my cmv4.0 FEL TEST files.

For some reason, it freezes when the player tries to read the cmv4.0 L8 trim with FEL. Most likely because it’s a homemade FEL but if you try the other non-fel CMV4.0 test files, there is no issue with the ugoos. And I watched tons of CMV4.0 FEL original movies and there’s no such problem.

2321

Yep, those are exactly the files I was testing. I wonder if it’s because these homemade ones have multiple layers to check compatibility, versus a file that’s hard-coded with the cmv4.0 trim only (assuming that’s how it works)

2322

With AM6B+ and the nightly, e.g. “21.1-Omega_nightly_20240804 (Amlogic-ng.arm)”

There are issues with some BDMV directory media or ISO Blu-ray media:

  1. After seeking, audio/video is out of sync
  2. After seeking, playback becomes stuttering

This happens for some but not all BDMV or ISO files, is there any way to fix this?

2323

Search the forum. Myself and a couple of others have already reported this before in the last couple of months. Until now, no fix has been implemented yet.

2324

who created the composite add-on (plex)? is this an add-on that gets often support with updates?

2325

This is normal, and honestly probably how it will always be. M2ts files aren’t really meant a a proper computer player container, they’re meant for physical media. It’s been that way since the old ts days.

1 Like
2326

Hey. Just want to thank you for this one! Only tested a bit but…

Now my AMB6+ wakes with IR from off or standby. Now it also can go into standby with IR remote and wake with IR. The best thing about it is that my sofabaton remote will quickly pair from standby (in my limited testing), but when it does it from power on it takes forever.

Anyway, standby is now usable and 3rd party remote pairs quickly.

Thanks! (Was a huge pain before this update)

2327

i want to turn my box off when the tv is off. but i can’t find the option in CEC-adapter. which one is it? i tried some options but it doesn’t work.

2328

What do you mean by this? I don’t understand why a physical blu-ray player which supports seeking and chapter selection is able to accomplish this without the audio going out of sync and stuttering, but playing via Kodi can’t?

In regards to the OP I also noticed this however its mostly an issue with FEL Dolby Vision movies like Mission Impossible for me. I notice it also is waaaaay more likely to happen when Kodi mistakenly starts playing the FEL video track by mistake instead of the primary video track.

2329

It’s almost like they’re different devices…

You could have a PC with a 4090 and it wouldn’t play DV FEL ISO/BDMVs.

I don’t understand why a physical blu-ray player is able to accomplish this … but playing via Kodi can’t?

You make it sound so simple, feel free to modify the code yourself and make it happen.

2330

Being different devices doesn’t explain the problem. I was hoping you could explain the problem to me. If you don’t want to that’s fine but you don’t need to be sarcastic.

1 Like
2331

To be clear I am a programmer so I might be interested in helping out but if this is considered “normal” and can’t be fixed then it would be good to know why the container format is the limiting factor.

2332

2 posts were merged into an existing topic: [S922X] Ugoos AM6(+), Help & Support

2333

A post was merged into an existing topic: [S922X] Ugoos AM6(+), Help & Support

2334

Hey brother. Honestly, I’m not exactly sure why it’s the case. I think it has to do with how a media player “indexes” time stamps. From what I understand, old containers like .ts (VHS/DVD) have always had a problem with skipping around the video when played back from a non-disc/tape format (ie computer). I have old .ts files from VHS and DVD rips from over a decade ago and have always had issues skipping around those media files on VLC for years. For some reason, actual VHS/DVD (.ts) or Bluray (.m2ts) players can skip around just fine. I guess something within the hardware allows it to “index” all the different points in a video. That’s why many BluRay releases will REMUX the file into a more compatible computer container, such as .mkv. Again, WHY this is the case, I’m not sure. But it comes down to how the media player indexes the file itself. If you have an actual BluRay folder-set (with index.bdmv and stream) - then you can easily remux it into a .mkv container, within which that file will be able to be skipped around without issue. So it isn’t just a Kodi issue. If I play a .m2ts file on VLC (or the BluRay folder itself) - if I begin skipping around with FF or RR then either (1) the audio easily becomes out of sync, or (2) if I rewinded 10 seconds, the file might actually rewind 30 seconds or a few minutes (and the audio stays in sync). And I have a 4090, so it isn’t a GPU problem. It’s just the container itself. So: it’s always worth remuxing whatever rip you have into a more compatible container that allows a computer device to seek around the media file without losing its “place.”

2335

Interesting, thanks for the information. I do notice that if I play a BDMV in VLC the timestamp on the player keeps decreasing and increasing erratically. I’m gonna have to think about how best to deal with this issue. I recently started buying 4K and 1080p blu-rays of my favourite movies because I’ve had stuff like my Apple account deleted by Apple so I’m skeptical of buying digital movies. Every disc I rip I make a full archival backup of it in case the disc dies or they get damaged. I use an AM6+ which for the most part has worked amazing. The only problems I’ve noticed are with certain Dolby Vision BDMV backups, it seems if they use profile 7 they’re particularly problematic. If I use the resume playback feature and Kodi mistakenly shows the second video track (the enhancement layer) then it’s always out of sync unless I open the blu-ray menus and use the scene selection feature instead. Normal SDR and HDR10 playback is absolutely fine. Perhaps I will try just remuxing my DV7 backups for now to see if that alleviates my issues.

2336

composite still doesn’t recognize external subs. Is there a chance for a fix?