Occasional black screen on Vero 4k

Complete system logs would be useful here


Just wanted to check do you want the logs when the black screen happens or just restart and send the logs as they are?

Let’s start with how they are so we can confirm your configuration.


Show mediainfo of the mkvs i suspect it is a variable framerate? Had the same issues at some WEBRips.

Had this happen again, however I have managed to find a time when it is repeatable which should hopefully help debug the issue.


I also have a video of it happening - I rewound the video after it happens to show that it isn’t an issue with the video at that specific point.

I’ve had a look at the logs, but there is a lot of noise in there and I am not 100% sure what I am looking for!

I disabled all of my plugins (which were clogging up the logs) and have got a much cleaner version of the log now with the issue happening:


You seem to be playing a TV show re-encoded to 24fps (25,30,50 or 60 expected). Did you make it yourself?

I did not.


I’ve a similiar issue here with a Vero4k. It seems to be reproducable whenever I power on my AVR and then wait 3-4 minutes (or start a playback). The effect here is that I get a blank screen for 2-3 seconds but also audio is dead in that short time interval.

Like you I have an Sony AVR in between the Vero and the TV (mine is a Panasonic plasma). The AVR model is a STR-DN1080.

Not sure whether this depends on the AVR or is a general issue with the Vero. Others are welcome with ideas how to troubleshoot.

Does it play if you turn off Adjust refresh rate and set the GUI to 1080p24 or 1080p23.9?

You could also try without the AVR in the chain to see if it’s similar to @JimKnopf’s issue.

Set the GUI to 1080p24 and turned off adjust refresh rate and it played through without the blank screen (although I could swear it stopped for a frame or too!).

Uploaded a log again:


However with adjust refresh rate off - if I play any 4k files they wouldn’t be rendered at full resolution correct?

Turning adjust refresh rate off was just for testing. Did you try 23.98Hz?

The bottom line is your file is tagged as 24fps but it’s actually 23.98fps. I’m not sure if we reckon to detect that and adjust accordingly. Try adding 1080p23.98Hz to your whitelist (and all the 4k resolutions you want) and turning adjust refresh rate back on.

Failing that, try changing the metadata in the file with a mkv editor.

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Just set up the whitelist as suggested. The same thing still happens:


Will look in to see if there is a way I can get something to scan my media and update any mismatches like this.

although using MediaInfo to look at the metadata and it says it is 23.97 in there:

Unique ID                                : 173147157403667290602868707403596010638 (0x8242EDF536E502A69CD43DA0B27F948E)
Complete name                            : /Volumes/TV Shows/Parks and Recreation/Season 07/S07E06 - Save JJ's (1080p WEB-DL).mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 876 MiB
Duration                                 : 21 min 30 s
Overall bit rate                         : 5 691 kb/s
Encoded date                             : UTC 2015-01-28 22:05:36
Writing application                      : mkvmerge v7.5.0 ('Glass Culture') 64bit built on Jan  4 2015 16:48:44
Writing library                          : libebml v1.3.1 + libmatroska v1.4.2

ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 21 min 30 s
Bit rate                                 : 5 305 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.107
Stream size                              : 816 MiB (93%)
Language                                 : English
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

ID                                       : 2
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : A_AC3
Duration                                 : 21 min 30 s
Bit rate mode                            : Constant
Bit rate                                 : 384 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 59.1 MiB (7%)
Language                                 : English
Service kind                             : Complete Main
Default                                  : Yes
Forced                                   : No

ID                                       : 3
Format                                   : UTF-8
Codec ID                                 : S_TEXT/UTF8
Codec ID/Info                            : UTF-8 Plain Text
Duration                                 : 21 min 21 s
Bit rate                                 : 116 b/s
Count of elements                        : 588
Stream size                              : 18.3 KiB (0%)
Language                                 : English
Default                                  : No
Forced                                   : No

Hmmm. I’m just going on this, which would read 23.98 if ffmpeg thought it was 23.98:

2019-08-16 09:58:30.410 T:3645895392 INFO: ffmpeg[D94FF2E0]: Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 2k tbc (default)

Mediainfo doesn’t necessarily report the metadata. It’s probably loking at some timestamps and would be finding frames 41.71 ms long like in your log:

DEBUG: CPtsTracker: detected pattern of length 1: 41708.33, frameduration: 41708.333333

Ok, so just edited the frame duration in the MKV metadata to match 23.98 fps and played through the section it normally blanked out fine:


Is there any other solution barring editing each file? I haven’t been able to find any tools which could scan my library and make these updates on a case by case basis.

I suspect you would need to write a custom script for that.

Wrote this bash script to analyse MKVs check what the metadata says the FPS is and check it against the actual file. If there is a mismatch the metadata is updated.

The coding is probably terrible as I don’t know much about writing bash scripts so worked it all out last night from Google and Stack Overflow, but either way might be helpful for someone. You need ffmpeg, mediainfo and mkvtoolnix installed. Just pass through as an argument the file path you want to look through (e.g. /TV Shows/Show/Season/*.mkv).

It shouldn’t cause any major issues I don’t think but obviously use this at your own risk!


for f in "$@"; do
	printf "$f\n"
	MetaData=`ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate "$f"`
    MetaDataSum=`echo "scale=3;$MetaData" | bc`

    Actual=`mediainfo "--Inform=Video;%FrameRate%;" "$f"`

    echo $MetaDataSum
    echo $Actual

	DefaultDurationFloat=`echo "scale=9;(1/$Actual)*1000000000" | bc` 
	DefaultDuration=`echo "scale=0;$DefaultDurationFloat/1" | bc`

	echo $DefaultDuration

    if [ $MetaDataSum != $Actual ]
		echo NO MATCH
		mkvpropedit "$f" --edit track:v1 --set default-duration=$DefaultDuration
		echo MATCH

    printf "\n"
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I am still getting black screens when watching media. I don’t think it is always an FPS issue that we were seeing earlier in the thread.

I thought it might be a cable issue, but have swapped a known good cable and it is still happening. Got the log from this evening but can’t see anything obvious in there:


Any ideas, I’d be pulling my hair out if I had any!

Is it always with the same TV series?