CE on Ugoos AM6B+ & AM9 Pro crashes on attempted playback of Dolby Vision 8.4 HLG base layer 4K60 MP4

jdrch · 19 July 2026 23:00

My Ugoos AM9 Pro running the official CoreELEC-Amlogic-no.aarch64-22.0-Piers_nightly_20260719-Genericbuild crashes when I attempt to play this file (can PM link for testing) with the following MediaInfo properties:

Summary

Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp41/mp42)
File size : 3.91 GiB
Duration : 12 min 49 s
Overall bit rate : 43.7 Mb/s
Frame rate : 60.000 FPS
Keywords : 2026-07-02,orange
Encoded date : 2026-07-06 21:44:34 UTC
Tagged date : 2026-07-06 21:59:51 UTC

Video
ID : 2
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : Dolby Vision, Version 1.0, Profile 8.4, dvhe.08.09, BL+RPU, no metadata compression, HLG compatible
Codec ID : hvc1
Codec ID/Info : High Efficiency Video Coding
Duration : 12 min 49 s
Bit rate : 43.5 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 60.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.088
Stream size : 3.90 GiB (100%)
Encoded date : 2026-07-06 21:44:34 UTC
Tagged date : 2026-07-06 21:59:51 UTC
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : HLG
Matrix coefficients : BT.2020 non-constant
AmbientViewingEnvironment_Illuminance : 15.7000 lux
AmbientViewingEnvironment_Chromaticity : D65
Codec configuration box : hvcC+dvvC

Audio
ID : 1
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 12 min 49 s
Source duration : 12 min 49 s
Bit rate mode : Constant
Bit rate : 160 kb/s
Channel(s) : 6 channels
Channel layout : C L R Ls Rs LFE
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 14.3 MiB (0%)
Source stream size : 14.3 MiB (0%)
Language : English
Encoded date : 2026-07-06 21:44:34 UTC
Tagged date : 2026-07-06 21:59:51 UTC

Image
Type : Thumbnail
Format : JPEG
Muxing mode : moov-udta-thmb
Width : 3 840 pixels
Height : 2 160 pixels
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Compression mode : Lossy
Stream size : 743 KiB (0%)

AM6B+ users have reported the crash affects them too.

A Gemini Plus analysis of the attached log files concludes it’s a hard kernel panic/reset:

When Kodi’s demuxer passes the raw dvvC configuration stream to the Amlogic video driver (amlvideo), the driver attempts to parse the RPU metadata and map it onto the HLG pipeline at 60 frames per second. The VPU encounters an unhandled register synchronization failure or a memory fence timeout, immediately forcing a hardware watchdog reset.

Any ideas? Thanks!

kodi_crash.log (8.4 MB)

kodi.old.log (252.0 KB)

kodi.log (4.4 MB)

vpeter · 20 July 2026 06:55

Ask him to make a fix also. Analysis is cheap and everyone can do it.

jdrch · 20 July 2026 07:12

Haha, I was just trying to provide a hint since I have no idea

Portisch · 20 July 2026 08:05

All samples are locked and only available for registration.
Provide a direct download link or nobody will help you.

jdrch · 20 July 2026 14:53

@Portisch @vpeter as I don’t have the rights to the file, I can’t post it publicly. Can one of you PM me for it, as I don’t think I can PM you.

vpeter · 20 July 2026 15:40

sample forwarded

vpeter · 20 July 2026 16:50

Homatics R 4K Plus with 20260719 plays this sample without issue over HTTP.

Update: seems I was able to play it yesterday but today not anymore.

Portisch · 21 July 2026 15:34

The issue is the streams aren’t in correct order:

2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'smb://192.168.1.7/Videos/Testvideos/DV/NASA-DV.mp4':
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:   Metadata:
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     major_brand     : mp42
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     minor_version   : 1
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     compatible_brands: isommp41mp42
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     creation_time   : 2026-07-06T21:44:34.000000Z
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:   Duration: 00:12:49.13, start: 0.000000, bitrate: 43721 kb/s
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:   Stream #0:0[0x1](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 156 kb/s (default)
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     Metadata:
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       creation_time   : 2026-07-06T21:44:34.000000Z
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       handler_name    : Core Media Audio
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:   Stream #0:1[0x2](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 43547 kb/s, 60 fps, 60 tbr, 60k tbn (default)
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     Metadata:
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       creation_time   : 2026-07-06T21:44:34.000000Z
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       handler_name    : Core Media Video
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:     Side data:
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       DOVI configuration record: version: 1.0, profile: 8, level: 9, rpu flag: 1, el flag: 0, bl flag: 1, compatibility id: 4, compression: 0
2026-07-21 17:24:22.922 T:1220     info <general>: ffmpeg[0x262f9740]:       Ambient viewing environment: ambient_illuminance=15.700000, ambient_light_x=0.312700, ambient_light_y=0.329000

After fix it by

ffmpeg -i NASA-DV.mp4 \
  -map 0:v:0 -map 0:a:0 \
  -c copy NASA-DV-remapped.mp4

2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'smb://192.168.1.7/Videos/Testvideos/DV/NASA-DV-remapped.mp4':
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:   Metadata:
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     major_brand     : isom
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     minor_version   : 512
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     compatible_brands: isomdby1iso2mp41
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     encoder         : Lavf61.7.100
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:   Duration: 00:02:45.74, start: 0.000000, bitrate: 45186 kb/s
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:   Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 45279 kb/s, 60 fps, 60 tbr, 60k tbn (default)
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     Metadata:
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:       handler_name    : Core Media Video
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     Side data:
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:       Ambient viewing environment: ambient_illuminance=15.700000, ambient_light_x=0.312700, ambient_light_y=0.329000
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:   Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 158 kb/s (default)
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:     Metadata:
2026-07-21 17:29:03.501 T:1525     info <general>: ffmpeg[0x39fa7580]:       handler_name    : Core Media Audio

So stream 0 is video, stream 1 is audio.
Sure there is a issue in kodi as it think it’s EL DV data because of video is not pid 0.
Will be solved one day…

jdrch · 22 July 2026 02:27

I asked the video’s creator if they would be able to export the video such that the streams are in the correct order. They said that’s how DaVinci Resolve and Apple Final Cut Pro export Dolby Vision files, and they don’t know of any other way to do it within those apps.