# Flicker when display Video with rpi3B and 288x128

**URL:** <https://rpi-rgb-led-matrix.discourse.group/t/flicker-when-display-video-with-rpi3b-and-288x128/278>\
**Category:** Uncategorized\
**Created:** [July 9, 2021, 8:04am UTC](https://rpi-rgb-led-matrix.discourse.group/t/flicker-when-display-video-with-rpi3b-and-288x128/278 "2021-07-09T08:04:22Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![trinhmaiba](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@trinhmaiba](https://rpi-rgb-led-matrix.discourse.group/u/trinhmaiba)\
**Post date:** [July 9, 2021, 8:04am UTC](https://rpi-rgb-led-matrix.discourse.group/t/flicker-when-display-video-with-rpi3b-and-288x128/278/1 "2021-07-09T08:04:22Z")

</div>

Hi,  
I’m using 18 x LED P5 panels (64x32 - from china) - Pi3 install Dietpi and trying to display an video with command: ./video-viewer --led-rows=32 --led-cols=64 --led-chain=9 --led-parallel=2 --led-slowdown-gpio=4 --led-pixel-mapper=“V-mapper;Rotate:270” --led-multiplexing=1 --led-pwm-bits=6 --led-limit-refresh=120 /video/myvideo.mp4, and I get some flicker. I see refresh rate too slow: 40-70Hz  
I already try some solution to resolve flicker issue like: --led-slowdown-gpio=2,3; isolcpus=3; -O/tmp/vid.stream but refresh rate still too slow (\<100 Hz).

Thank you so much for any help that you have.

---

<div class="post-metadata">

**Author:** ![raspberry.pi.maker](https://yyz2.discourse-cdn.com/free1/user_avatar/rpi-rgb-led-matrix.discourse.group/raspberry.pi.maker/32/138_2.png) [@raspberry.pi.maker](https://rpi-rgb-led-matrix.discourse.group/u/raspberry.pi.maker)\
**Post date:** [July 19, 2021, 9:57am UTC](https://rpi-rgb-led-matrix.discourse.group/t/flicker-when-display-video-with-rpi3b-and-288x128/278/2 "2021-07-19T09:57:40Z")

</div>

I think led-chain is too long.  
I recommand that you use P3, so --led-parallel=3, --led-chain=6.  
The longer the Daisy chain, the lower the refresh rate.

---

<div class="post-metadata">

**Author:** ![marcmerlin](https://yyz2.discourse-cdn.com/free1/user_avatar/rpi-rgb-led-matrix.discourse.group/marcmerlin/32/40_2.png) [@marcmerlin](https://rpi-rgb-led-matrix.discourse.group/u/marcmerlin)\
**Post date:** [August 2, 2021, 5:11am UTC](https://rpi-rgb-led-matrix.discourse.group/t/flicker-when-display-video-with-rpi3b-and-288x128/278/6 "2021-08-02T05:11:54Z")

</div>

rPi4 and rPi3 gave me close enough to the same performance for 384x256, I can push it to 384x320 but after that the refresh rate will be too low.  
Things that will help with refresh rate:  
–led-pwm-dither-bits=1 (2 is dimmer and faster)  
–led-pwm-bits=7  
–led-pwm-lsb-nanoseconds=70