It could just be me being incredibly anal about my device but has anyone else noticed occasion drop in frame rate while scrolling between hone screens?
I haven't, but always try to make sure that Power Saver isn't enabled when addressing stutters and lag.
Related
It seems like on occasion, when I plug my phone into anything, the screen gets a slight amount of interference. It's hard to notice, but it's almost like frame tearing if anyone has ever experienced it (reminds you of seeing a video with a CRT monitor in it, where you can see the frames changing). Any ideas on how to fix it, or if it's a shielding issue with the phone?
Hi All, I am facing a strange issue with xz1 compact where only slow motion videos are coming distorted normal videos are good but when I click on 960 fps button screen start flickering.
Here is the video of the same issue
Not able to post url please paste it in your browser and remove the space after /
youtu.be/ NMNPz8QVIhI
Please help me to resolve it I am on April stock build and not unlocked the bootloader.
sourabh0077 said:
Hi All, I am facing a strange issue with xz1 compact where only slow motion videos are coming distorted normal videos are good but when I click on 960 fps button screen start flickering.
Here is the video of the same issue
Not able to post url please paste it in your browser and remove the space after /
youtu.be/ NMNPz8QVIhI
Please help me to resolve it I am on April stock build and not unlocked the bootloader.
Click to expand...
Click to collapse
Fairly certain the flicker is due to the LED lighting around you. Most LED lights flicker around 50-60Hz, which is more or less at 50-60 frames per second (please correct me if I'm wrong, I'm not 'that' tech savvy), and what happens is your camera films at 960fps.
You get the picture.
Syberyon said:
Fairly certain the flicker is due to the LED lighting around you. Most LED lights flicker around 50-60Hz, which is more or less at 50-60 frames per second (please correct me if I'm wrong, I'm not 'that' tech savvy), and what happens is your camera films at 960fps.
You get the picture.
Click to expand...
Click to collapse
Hi Sybryon, Thanks for replying I can agree with the flickering in slow Mo but the issue is even before clicking the slow Mo button the Flickr starts.
Here is the video where you can see the quality degraded before going for slo-mo.
youtu.be /wRIA9nGWgCU
sourabh0077 said:
Hi Sybryon, Thanks for replying I can agree with the flickering in slow Mo but the issue is even before clicking the slow Mo button the Flickr starts.
Here is the video where you can see the quality degraded before going for slo-mo.
youtu.be /wRIA9nGWgCU
Click to expand...
Click to collapse
This is business as usual. Nothing wrong with your phone.
The artificial lights in the room you are in are pulsing at 100Hz because the power grid in your country is running at 50Hz.
When you go in to slow motion mode, the camera goes to 720p60 (as well as adjusting the shutter speed for 720p960 operation).
Take 60 or 960 and divide it by 50 or 100 = Odd number = flicker
Take 60 or 960 and divide it by 60 or 120 = Even number = no flicker.
Options
a) Buy better lights with proper AC filtering or
b) Go outside and film in sunlight or
c) Move to a country which has a 60Hz power grid.
https://www.youtube.com/watch?v=uzP8FFKpwQ0
Syberyon said:
Fairly certain the flicker is due to the LED lighting around you. Most LED lights flicker around 50-60Hz, which is more or less at 50-60 frames per second (please correct me if I'm wrong, I'm not 'that' tech savvy), and what happens is your camera films at 960fps.
You get the picture.
Click to expand...
Click to collapse
Almost correct.
LED's do not flicker inherently. LED's run on DC, Direct Current, which is constant.
It's the inadequate AC filtering and DC ripple filtering in their power supplies that makes them flicker.
Some LED's can even flicker visibly, especially if dimmed, while some only show their flicker if you take video of them with a framerate that doesn't match the utility frequency.
Incandescent lights flicker just as well because of AC, alternating current. Lower power ones show it more while higher power ones have a physically thicker wire filament (so they can handle the power) which just happens to also retain the heat longer and as a result flicker less. This is because when the voltage goes down the light output doesn't drop as drastically as it does with "regular" power incandescents.
CFL's can flicker also, especially the early ones or cheap ones. While modern, good quality CFL's with electronic ballasts refresh themselves somewhere in the neighbourhood of 10kHz to 40kHz which is waaaay beyond visible.
FPS Always Drop
Bad for playing game
Excellent for Camera
But big no for gaming
Noticed the same thing while playing YouTube videos at [email protected]/60fps at 2x speed. The video is smooth for the most part untill what I would describe as the CPU throttles and I get choppy video for about 5 seconds or so and then it resumes regular smooth playback.
It could also be that the CPU doesn't throttle at that point because the phone isn't extremely hot at that point and it could just be that some background process just starts at that time causing lag. I've read that for some users, writing to the memory (internal) causes the system to freeze so it could be a case that there is a process that occasionally writes to the memory in the background which isn't handled well and causes some lag.
Opinions on this theory?
ILA said:
Noticed the same thing while playing YouTube videos at [email protected]/60fps at 2x speed. The video is smooth for the most part untill what I would describe as the CPU throttles and I get choppy video for about 5 seconds or so and then it resumes regular smooth playback.
It could also be that the CPU doesn't throttle at that point because the phone isn't extremely hot at that point and it could just be that some background process just starts at that time causing lag. I've read that for some users, writing to the memory (internal) causes the system to freeze so it could be a case that there is a process that occasionally writes to the memory in the background which isn't handled well and causes some lag.
Opinions on this theory?
Click to expand...
Click to collapse
I think stock kernel is bad, limited by thermal throttling, because for stability battery life, not for performance.
We must waiting the dev release custom rom or custom kernel
Hi, when I use the slow motion , the whole display starts to flicker, but still works. all the other camera modes are fine.
Is that software issue?
Keyvannn said:
Hi, when I use the slow motion , the whole display starts to flicker, but still works. all the other camera modes are fine.
Is that software issue?
Click to expand...
Click to collapse
The display is flickering while recording, or the video when playing back? I just tried, I don't see any flickering while recording. But if it's in the recorded video, what kind of lighting are you in? I recently tried to take a slo-mo with my S20, and had significant flashing. It was at night, I figured it was due to the LED lighting flash rate being slowed down.
dscline said:
The display is flickering while recording, or the video when playing back? I just tried, I don't see any flickering while recording. But if it's in the recorded video, what kind of lighting are you in? I recently tried to take a slo-mo with my S20, and had significant flashing. It was at night, I figured it was due to the LED lighting flash rate being slowed down.
Click to expand...
Click to collapse
Yes, i would suspect this. Unbeknownst to the average person, LED lights tend to flicker A LOT. They do this at a given harmonic of the line frequency. If you're in the US then the LED will flicker either at 60Hz or 120Hz. Most people can't see this at full speed as the light has a bit of persistence and we're geared to see smooth motion. But, when you slow it down you find that at 240Hz or 480Hz the video is now fast enough to catch the dark patches in between the pulses. So, the video seems to strobe. Not all LED bulbs will do this and those that do won't all do it the same. But, it's there, you just can't see it. Keep in mind when shooting video in other modes this could still happen. At 60Hz or 120Hz video even though it's full speed you are still potentially capturing some frames in between pulses. This could cause a sort of beat frequency to appear. So, if anyone is having that problem when trying to shoot video your options are 1: do it in the sunlight. The sun doesn't flicker. or 2. Get a constant light source. Fluorescent bulbs have greater persistence as do the old incandescent bulbs. Professional lighting will be consistent too. But, $4 LED bulbs are going to SUUUUCK for slow mo video.
Yes. You were right. The problem was the led bulb.
That was interesting.
Thanks guys
I suffer from white lines appearing on the screen when playing an online video in different places every two minutes and this problem occurs only at 120hz and adaptive brightness is on, but when the adaptive brightness is off, this problem does not occur, does anyone suffer from this problem and it also does not happen if The screen frequency was 60Hz, does anyone have this problem and what is the solution, thank you
no offence but your photos are extremely low quality, if there's an issue no-one could tell.
3mel said:
no offence but your photos are extremely low quality, if there's an issue no-one could tell.
Click to expand...
Click to collapse
Like this photo
I see the same thing.
It flashes only one frame, I assume, but could be 2 or 3 frames.
For me it can be two white lines near the top, or one line more to the bottom.
I see it on YouTube and Netflix...
3mel said:
no offence but your photos are extremely low quality, if there's an issue no-one could tell.
Click to expand...
Click to collapse
It is probably "low quality" because he had to use "slow motion mode" or a high framerate camera to catch the line flash... It is a really fast flash of a white line, about 1mm wide, across the screen.