EOS ARM - video is stuttering

Hoping to get this fixed. I have a pi4 4GB hooked up to a 1080p TV to use for workout videos. Heatsinks are correctly applied, it’s not overheating.

The problem is that there is video stutter on videos played by VLC & parole. Mplayer there isn’t stutter, but the video is small (won’t go full screen). I’m wondering if my problem has to do with upscaling and if maybe increasing the iGPU memory could fix that. I’ve previously used raspian and raspi-config had an easy way to increase iGPU memory, not sure if EOS ARM has a similar trick.

Check if your VLC has the MMAL x11 splitter for Raspberry Pi as per image below.
Also, check your CPU usage while playing the video.

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No, I don’t have “MMAL x11 splitter” as an option

Just out of curiosity, which DE is installed?


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I also made sure my system was fully up to date, and my vlc version is 3.0.12

Sorry for the picture instead of a screenshot, on mobile.

Here is one thing you can try for audio stutter. Raspberry Pi does not play nice with pulseaudio.

So in VLC go to “tools” then " preferences" and click on the Audio tab.
under “output Module” it will probably be “Automatic” Change it to “Alsa audio output”
Then under device, change it to whatever the audio device name is. I’m sorry, I am working on the installer and I don’t have a working Raspberry Pi 4B up and running at the moment.
But you can in a terminal, type alsamixer. Then F6 and it should list the audio devices. Make “device” in VLC match what is shown in alsamixer. Reboot.

Try that, then we will go from there.

Come to think of it, there is a Topic on this with screenshots.


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Sorry, I don’t have an issue with audio stutter, I have an issue with video stutter possibly dealing with upscaling a 720x480 video to 1080p display.

Although I did check out that fix, and vlc won’t play any video now. I don’t know what’s going on.

I’m sorry, i did not catch the upscaling 720x480 to 1080.

Here is the default /boot/config.txt file I supply with the installer script.

cat /boot/config.txt
# See /boot/overlays/README for all available options

initramfs initramfs-linux.img followkernel
# hdmi_group=1
# hdmi-mode=4
#Enable DRM VC4 V3D driver on top of the dispmanx display
# over_voltage=5
# arm_freq=2000
# gpu_freq=750

# hdmi_group=1
# hdmi_mode=4
are commented out. Thus the RPi uses auto-detect for screen resolution.
Use vi or nano to uncomment these two items, and use the information provided below to insert the values you need. This will allow you to set whatever resolution works best.



The hdmi_group command defines the HDMI output group to be either CEA (Consumer Electronics Association, the standard typically used by TVs) or DMT (Display Monitor Timings, the standard typically used by monitors). This setting should be used in conjunction with hdmi_mode .

hdmi_group result
0 Auto-detect from EDID
hdmi_mode for CEA (TVs)


Together with hdmi_group , hdmi_mode defines the HDMI output format.
These values are valid if hdmi_group=1 (CEA):

hdmi_mode 	Resolution 	Frequency 	Screen Aspect 	Notes
1 	VGA (640x480) 	60Hz 	4:3 	
2 	480p 	60Hz 	4:3 	
3 	480p 	60Hz 	16:9 	
4 	720p 	60Hz 	16:9 	
5 	1080i 	60Hz 	16:9 	
6 	480i 	60Hz 	4:3 	
7 	480i 	60Hz 	16:9 	
8 	240p 	60Hz 	4:3 	
9 	240p 	60Hz 	16:9 	
10 	480i 	60Hz 	4:3 	pixel quadrupling
11 	480i 	60Hz 	16:9 	pixel quadrupling
12 	240p 	60Hz 	4:3 	pixel quadrupling
13 	240p 	60Hz 	16:9 	pixel quadrupling
14 	480p 	60Hz 	4:3 	pixel doubling
15 	480p 	60Hz 	16:9 	pixel doubling
16 	1080p 	60Hz 	16:9 	
17 	576p 	50Hz 	4:3 	
18 	576p 	50Hz 	16:9 	
19 	720p 	50Hz 	16:9 	
20 	1080i 	50Hz 	16:9 	
21 	576i 	50Hz 	4:3 	
22 	576i 	50Hz 	16:9 	
23 	288p 	50Hz 	4:3 	
24 	288p 	50Hz 	16:9 	
25 	576i 	50Hz 	4:3 	pixel quadrupling
26 	576i 	50Hz 	16:9 	pixel quadrupling
27 	288p 	50Hz 	4:3 	pixel quadrupling
28 	288p 	50Hz 	16:9 	pixel quadrupling
29 	576p 	50Hz 	4:3 	pixel doubling
30 	576p 	50Hz 	16:9 	pixel doubling
31 	1080p 	50Hz 	16:9 	
32 	1080p 	24Hz 	16:9 	
33 	1080p 	25Hz 	16:9 	
34 	1080p 	30Hz 	16:9 	
35 	480p 	60Hz 	4:3 	pixel quadrupling
36 	480p 	60Hz 	16:9 	pixel quadrupling
37 	576p 	50Hz 	4:3 	pixel quadrupling
38 	576p 	50Hz 	16:9 	pixel quadrupling
39 	1080i 	50Hz 	16:9 	reduced blanking
40 	1080i 	100Hz 	16:9 	
41 	720p 	100Hz 	16:9 	
42 	576p 	100Hz 	4:3 	
43 	576p 	100Hz 	16:9 	
44 	576i 	100Hz 	4:3 	
45 	576i 	100Hz 	16:9 	
46 	1080i 	120Hz 	16:9 	
47 	720p 	120Hz 	16:9 	
48 	480p 	120Hz 	4:3 	
49 	480p 	120Hz 	16:9 	
50 	480i 	120Hz 	4:3 	
51 	480i 	120Hz 	16:9 	
52 	576p 	200Hz 	4:3 	
53 	576p 	200Hz 	16:9 	
54 	576i 	200Hz 	4:3 	
55 	576i 	200Hz 	16:9 	
56 	480p 	240Hz 	4:3 	
57 	480p 	240Hz 	16:9 	
58 	480i 	240Hz 	4:3 	
59 	480i 	240Hz 	16:9 	
60 	720p 	24Hz 	16:9 	
61 	720p 	25Hz 	16:9 	
62 	720p 	30Hz 	16:9 	
63 	1080p 	120Hz 	16:9 	
64 	1080p 	100Hz 	16:9 	
65 	Custom 			
66 	720p 	25Hz 	64:27 	Pi 4
67 	720p 	30Hz 	64:27 	Pi 4
68 	720p 	50Hz 	64:27 	Pi 4
69 	720p 	60Hz 	64:27 	Pi 4
70 	720p 	100Hz 	64:27 	Pi 4
71 	720p 	120Hz 	64:27 	Pi 4
72 	1080p 	24Hz 	64:27 	Pi 4
73 	1080p 	25Hz 	64:27 	Pi 4
74 	1080p 	30Hz 	64:27 	Pi 4
75 	1080p 	50Hz 	64:27 	Pi 4
76 	1080p 	60Hz 	64:27 	Pi 4
77 	1080p 	100Hz 	64:27 	Pi 4
78 	1080p 	120Hz 	64:27 	Pi 4
79 	1680x720 	24Hz 	64:27 	Pi 4
80 	1680x720 	25z 	64:27 	Pi 4
81 	1680x720 	30Hz 	64:27 	Pi 4
82 	1680x720 	50Hz 	64:27 	Pi 4
83 	1680x720 	60Hz 	64:27 	Pi 4
84 	1680x720 	100Hz 	64:27 	Pi 4
85 	1680x720 	120Hz 	64:27 	Pi 4
86 	2560x720 	24Hz 	64:27 	Pi 4
87 	2560x720 	25Hz 	64:27 	Pi 4
88 	2560x720 	30Hz 	64:27 	Pi 4
89 	2560x720 	50Hz 	64:27 	Pi 4
90 	2560x720 	60Hz 	64:27 	Pi 4
91 	2560x720 	100Hz 	64:27 	Pi 4
92 	2560x720 	120Hz 	64:27 	Pi 4
93 	2160p 	24Hz 	16:9 	Pi 4
94 	2160p 	25Hz 	16:9 	Pi 4
95 	2160p 	30Hz 	16:9 	Pi 4
96 	2160p 	50Hz 	16:9 	Pi 4
97 	2160p 	60Hz 	16:9 	Pi 4
98 	4096x2160 	24Hz 	256:135 	Pi 4
99 	4096x2160 	25Hz 	256:135 	Pi 4
100 	4096x2160 	30Hz 	256:135 	Pi 4
101 	4096x2160 	50Hz 	256:135 	Pi 4
102 	4096x2160 	60Hz 	256:135 	Pi 4
103 	2160p 	24Hz 	64:27 	Pi 4
104 	2160p 	25Hz 	64:27 	Pi 4
105 	2160p 	30Hz 	64:27 	Pi 4
106 	2160p 	50Hz 	64:27 	Pi 4
107 	2160p 	60Hz 	64:27 	Pi 4
hdmi_mode for DMT (Computer Monitors)


These values are valid if hdmi_group=2 (DMT):

|hdmi_mode|Resolution|Frequency|Screen Aspect|Notes|
| --- | --- | --- | --- | --- |
|15|1024x768|43Hz|4:3|incompatible with the Raspberry Pi|
|22|1280x768|60Hz|15:9|reduced blanking|
|26|1280x768|120Hz|15:9|reduced blanking|
|27|1280x800|60|16:10|reduced blanking|
|31|1280x800|120Hz|16:10|reduced blanking|
|34|1280x960|120Hz|4:3|reduced blanking|
|38|1280x1024|120Hz|5:4|reduced blanking|
|40|1360x768|120Hz|16:9|reduced blanking|
|41|1400x1050|60Hz|4:3|reduced blanking|
|45|1400x1050|120Hz|4:3|reduced blanking|
|46|1440x900|60Hz|16:10|reduced blanking|
|50|1440x900|120Hz|16:10|reduced blanking|
|56|1600x1200|120Hz|4:3|reduced blanking|
|57|1680x1050|60Hz|16:10|reduced blanking|
|61|1680x1050|120Hz|16:10|reduced blanking|
|64|1792x1344|120Hz|4:3|reduced blanking|
|67|1856x1392|120Hz|4:3|reduced blanking|
|68|1920x1200|60Hz|16:10|reduced blanking|
|72|1920x1200|120Hz|16:10|reduced blanking|
|75|1920x1440|120Hz|4:3|reduced blanking|
|76|2560x1600|60Hz|16:10|reduced blanking|
|80|2560x1600|120Hz|16:10|reduced blanking|
|81|1366x768|60Hz|16:9|[NOT on Pi4](https://www.raspberrypi.org/documentation/configuration/config-txt/pi4-hdmi.md)|
|83|1600x900|60Hz|16:9|reduced blanking|
|84|2048x1152|60Hz|16:9|reduced blanking|
|86|1366x768|60Hz|16:9|reduced blanking|

Note that there is a pixel clock limit.The highest supported mode on models prior to the Raspberry Pi 4 is 1920x1200 at 60Hz with reduced blanking, whilst the Raspberry Pi 4 can support up to 4096x2160 (known as 4k) at 60Hz. Also note that if you are using both HDMI ports of the Raspberry Pi 4 for 4k output, then you are limited to 30Hz on both.

The above information and charts are condensed from:
raspberry pi documentation

HTH Play around with those settings and hopefully fix the problem.



I still have my SD card with EOS ARM on it, but I’ll fix it much later. It seemed slow and unstable, to the point where I thought I had a hardware issue. I found another SD card and installed Manjaro ARM on it (much easier to install and 64-bit OS). Now it runs faster, is more stable, and the video works out of the box. So for my pi4 I’m switching to Manjaro now.

Whatever the problem was on my EOS ARM install, it probably needs to be fixed by reinstalling the OS. What I’d like to see in its future is a single image file that can be downloaded and flashed using something like Etcher, instead of the two-step process to install EOS currently.

Thanks for your help though!

  • Ben
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so you install 32bit on your Pi4 4Gb or you use 64bit ? EOS arm do both :wink: