4K AVC video playback


this is day 3 with my Vero 4K+ and I have trouble playing back some videos. I have noticed that may UHD demo videos I have are not working. Playback starts, the TV changes to 4K resolution but the screen stays black and I am only getting a crackling sound out of my speakers.

This is one of the files in questions:

Complete name                            : /net/Public/Demos/UHD/AWAKENING _ NEW ZEALAND 4K_UHD (2160p).mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 675 MiB
Duration                                 : 4 min 26 s
Overall bit rate                         : 21.2 Mb/s
Encoded date                             : UTC 1904-01-01 00:00:00
Tagged date                              : UTC 1904-01-01 00:00:00
Writing application                      : Lavf55.33.100

ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.1
Format settings, CABAC                   : No
Format settings, ReFrames                : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 4 min 26 s
Bit rate                                 : 21.0 Mb/s
Width                                    : 4 096 pixels
Height                                   : 2 304 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.089
Stream size                              : 667 MiB (99%)
Encoded date                             : UTC 1904-01-01 00:00:00
Tagged date                              : UTC 1904-01-01 00:00:00

ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 4 min 26 s
Bit rate mode                            : Constant
Bit rate                                 : 254 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 spf)
Compression mode                         : Lossy
Stream size                              : 8.06 MiB (1%)
Default                                  : Yes
Alternate group                          : 1
Encoded date                             : UTC 1904-01-01 00:00:00
Tagged date                              : UTC 1904-01-01 00:00:00

Here are the logs: http://paste.osmc.tv/eyehiboduk

BTW: All files plays back fine on my PC.

Have you got a URL for that file? I can’t seem to find it.

Using Kodi or some other player?

Looks like you are trying to play back the iso. You should have more success remuxing to mkv

The file extension is .MP4

One thing which jumped out at me is the video resolution: 4096x2304. Can the Vero 4K handle that? (Standard 4K is 3840x2160).

Also, 4K or higher resolution but encoded as H.264 (which I think is what AVC is!) might cause problems. 4K video is normally HEVC/H.265.

Plain Kodi. As it turns out the Vero 4K+ can now also play it (see my answer at the bottom).

Sorry, I don’t know where the video was coming from originally. It’s available on YouTube but you’ll get VP9 there nowadays.

Yeah, this is indeed a bit odd. The video is also available on YouTube, so I redownloaded and checked again - this time it is 3840x2160 (and VP9) and can be played back.

But here comes the deal: during my experiments with the Vero I have also changed HDMI cables (don’t know why exactly). With one of my HDMI cables (Ultra HDTV premium certified) the file can be played back! With the HDMI cable that came with the Vero I am getting that black screen and crackling sound from my AVR. Even stranger is that the VP9 version from YouTube works with the bundled HDMI cable. What a bummer!

Thank you guys for all of the answers and suggestions. This whole Vero 4K+ thing does not really have a good start for me :frowning: At least this very issue is now solved, but I still have mixed feelings about all this.

Can you confirm if this is direct to the TV?

We can send you a new cable if you would like

1 Like

Thank you for the offer, but I need a longer HDMI cable anyway. And I am still not sure if I am going to keep the 4K+ anyway, as there are still a number of issues for me (e.g. Full RGB output not working). I know the 7 days are running out, but I am still undecided. Although there are issues, I definitely appreciate the awesome support on these forums (you guys should not be working on weekends :wink: ).

Just checked, the fun thing is: the “Vero cable” works when the Vero 4K+ is connected directly to the TV, even with this video. Only if the AVR is in between, the cable is failing with that particular video. That’s where I need the UHD premium cable, probably because timing is critical when the AVR is processing the signal. Very strange, though …

The return policy is 14 days post-receipt.

We can fix the issue for you; but 14 days isn’t giving us a lot of time to resolve this.

This actually suggests that the issue is the cable between AVR to TV.


Well, other devices connected to my AVR (even my PC with a 30m Fibre-HDMI-Cable) do not have any issues with 4K, not even at 60Hz. But I just tested the connection from AVR to TV with another cable (the UHD Premium cable which is known to work), and it did not change anything about that.

Anyway, at least that cable thing is working for me now, thanks again for the suggestions.