Develop Bugs

[Q] 1080p video recording inconsistencies

Hola everyone.
So got my HOX last Friday, and been loving my phone. However, I decided to test the video recording capabilities.
I went to a nearby starbucks and just randomly recorded people passing by and I do notice slight jittering sometimes. So I decided to check the framerate with MX Player.
To my surprise, it says 1920x1080 @ 60fps! (well 59.xxxxx). Granted, it was a really well lit starbucks but even then.. I remember the camera only being able to record at 30fps?
Then I came back, and I'm in my room now and it's 7.30pm. So I decided to try again. I pointed my camera at my room light and started recording. I focused on the light so everything surrounding the light is just pitch black. This way I can get higher fps (light is way bright, hence faster shutter speed, theoretically more fps).
Then I checked and it shows @ 30fps? @[email protected]
I recorded another video, this time at a pitch black pc monitor. Fps dropped to an expected 14.xx fps.
Is the HOX camera really capable of recording [email protected] if it's bright enough? I don't know but that's what the file properties is telling me. Anyone experience the inconsistent to sometimes record at 30fps and sometimes at 60fps?

No one has experienced this? >.<

nope
i see min 6mbps, max10mbps and fps between 19 (yes, even in daylight!) and 29
in the evening (lowlight outside) i get 14 fps
the quality is really good though (lighting and noise wise) but the bitrate sucks.
fps is a tradeoff with exposure though in lowlight.

Hmm, then I'm not sure why I see some of my recorded videos showing at 60fps. Will record more in daylight tomorrow and will do more analysis.

That's maybe a tegra3 issue. Tegra2 has the same issue. Let's see AT&T version with Krait processor...

I can vouch for this, I also saw it on a couple of videos and I was just as surprised, I assumed it was a software glitch.
Will try to take a picture of it if stumble upon it again.

I've never been able to reproduce 60fps again after I created this thread... >.<
Sent from my HTC One X using xda premium

ArmedandDangerous said:
I've never been able to reproduce 60fps again after I created this thread... >.<
Sent from my HTC One X using xda premium
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Do you still have a 60 fps video? Can you upload one?

Could it be possible that you accidentally recorded a slowmo 60 fps video instead of a normal one?
i think only the htc video player will play these in slowmo and others might call it 60 fps vids,
also bs player showed me two movies at a ridiculous frame rate of 1800+ fps hence why it could not use the svp plugin on it to double the frame rate...
of course that mp classic showed it as 24 fps and was capable of using the svp on it.
could be a video analasys glitch by mx player.
and yet video is jittery on the hox. on aosp too.
the overall video is smooth but with little stutters.

[Q] Why is the refresh rate on the Note 2 58hz?

Hello folks,
I have had my Note 2 for a couple of days now and almost immediately noticed something strange. There is a VERY subtle flickering of the white and light grey areas of the screen. A very high frequency flicker, almost like I can see the refresh rate of the screen. My initial suspicion was that the refresh rate was lower than 60hz. So, I downloaded the app called Android System Info, and sure enough, under display, it was being reported that the refresh rate of the screen is 58hz. I got another friend with a Note 2 to confirm the same thing. My GS3 reports 60hz, and so does my friends HTC One S. So my question is, why is the refresh rate on the Note 2 not 60hz? Is this an intrinsic hardware limitation? Or can this be changed with software? My eyes can definitely notice the 2 less frames per second, I was using a GS3 since June, and switching to the Note, I immediately noticed the refresh rate was lower. Why? This is very strange to me. There are many videos on YouTube with the Note 2 and GS3 on the screen at the same time, and sometimes there is banding interference on one phone and not the other, meaning obviously the phones are running different refresh rates. Now I know the Note 2 refresh rate is lower, why? And is there anyway to change it with software?
Thanks much!

first, i think u should get yr note2 to warranty,
second, u sure yr eyes can differentiate 58hz and 60hz......?

emprize said:
first, i think u should get yr note2 to warranty,
second, u sure yr eyes can differentiate 58hz and 60hz......?
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It is EXTREMELY subtle, almost a non issue, so I doubt warranty will even say anything is wrong. I can notice it on all the demo models i've seen, so I doubt it has anything to do with my phone.
I have confirmed on 3 different Note 2s, the reported refresh rate in the app 'Android System Info' is 58hz. While all other phones I have used report 60hz.
I just find this so strange that maybe someone has a great explanation as to why this is the case. And maybe someone can dig deeper than I can and figure out if this is in the OS or an intrinsically hardware thing. I wish I had the email of a Samsung engineer who worked on the design of this phone, would love their take on why this is the case. 58hz is just such a strange refresh rate.

Goontron said:
It is EXTREMELY subtle, almost a non issue, so I doubt warranty will even say anything is wrong. I can notice it on all the demo models i've seen, so I doubt it has anything to do with my phone.
I have confirmed on 3 different Note 2s, the reported refresh rate in the app 'Android System Info' is 58hz. While all other phones I have used report 60hz.
I just find this so strange that maybe someone has a great explanation as to why this is the case. And maybe someone can dig deeper than I can and figure out if this is in the OS or an intrinsically hardware thing. I wish I had the email of a Samsung engineer who worked on the design of this phone, would love their take on why this is the case. 58hz is just such a strange refresh rate.
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you are the man, mate, my eyes cant even differentiate 50 and 60 Hz, for all my note2 experience, i cant see any unusual on the screen.
But for the 58hz issue, i think its not quite a strange thing for me, it reminds me when i was using CRT monitor(or early lcd?), it always can set the refresh rate to 58hz or 60hz, but it might like u say a hardware or driver problem, hope u can contact with samsung engineer and tell us the answer

I suppose the app might be reading the values of somewhere not actually measuring it or something ! Correct me if am wrong .

this is interesting. i also notice a subtle flicker of the screen. it's annoying in some lighting. i don't notice it on other phones.. it's definitely seems like the refresh rate is a bit slower than it should be.

The refresh rate is correlated with the resolution and the main base clock which feeds the display controller, in this case 1280 * 720 * 58Hz = ~54Mhz plus some margins for which are too long to describe, which gives them a target frequency of about 54MHz for a 16 divider of the 880MHz base clock. That's the main reason of the 58 vs 60 Hz difference.
But the reason you're seeing flickering might be completely unrelated to that and caused by some odd much lower timings in the display settings. Maybe a developer with the device could test it out by changing them.

AndreiLux said:
The refresh rate is correlated with the resolution and the main base clock which feeds the display controller, in this case 1280 * 720 * 58Hz = ~54Mhz plus some margins for which are too long to describe, which gives them a target frequency of about 54MHz for a 16 divider of the 880MHz base clock. That's the main reason of the 58 vs 60 Hz difference.
But the reason you're seeing flickering might be completely unrelated to that and caused by some odd much lower timings in the display settings. Maybe a developer with the device could test it out by changing them.
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Thanks for that information, it's great technical info I've been looking for. So it's basically a ratio/multiplier of some clock speed in the hardware. But now my question is, why would the Note 2 be any different than a GS3? I would think they have relatively the same hardware, and resolution on both screens is the same, so why would the refresh rates differ? Just seems to me that 58hz is not an ideal refresh rate. I mean, the main reason there is a trend towards 120hz TVs these days is because both movies (24 fps) and TV (30 fps) are evenly divisible into 120. Whereas with a 60hz TV, there is a remainder on 24, so movies do not interpolate as smoothly. With 58hz, no recorded content I can think of divides evenly into it, always making interpolation less smooth. Again, in my mind, 58hz is just silly, why not just give me the extra 2hz!! Doesn't make sense to me.
Final question. Would there be any way with software to change the refresh rate? Or is this set in stone at the hardware level?

I have an issue with this as well - I'm getting either fairly heavy frame skipping in any 8 or 16 bit emulator with frame skipping set to auto, or sound skipping with frame skipping turned off. I suspect this is because of the odd refresh rate with the app expecting 60hz and only running at 58 in reality, causing either the video or audio to run out of sync and needing to skip the two frames here and there to catch up. If the emulators could slow down the audio speed to match the slower video speed, it wouldn't be an issue.... but this shouldn't be the problem of the emu authors.
This happens with no other applications installed on a brand new phone. I've also installed clean rom and perseus kernel, no change. Power settings are all off, nothing is hitting my CPU to cause the frameskipping and it's very consistent, which leans towards the refresh rate causing the issues. Anyone know anything more about this? What a pain...

I am a traffic cop and I can definitely tell the difference between a car going 58mph and one going 60mph.
Sent from my GT-N7100

@rbiter said:
I am a traffic cop and I can definitely tell the difference between a car going 58mph and one going 60mph.
Sent from my GT-N7100
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I'm a noob and I don't know what "stuttering" is
But seriously, it's not like a mobile device should be able to emulate another system anyway, am i rite? Just use it for phone calls and internet browsing...

i think the reason why the refresh rate between gs3 and note2 is different due to both are using different lcd even though some of the hardware is the same.
even though the diff is small but it still incur some major hiccup where the frame skip especially with project butter where they keep the ui at 60fps.
maybe we can email to samsung engineer and they can take a look at it.

Change screen resolution?

Hey! I'm getting my pixel 2 XL tomorrow and have been looking around to see if I could change the screen resolution at all. (like on samsung phones) I feel like I'd be okay with 1080p as it's all I've used on oneplus phones for the past 4 years. I'd enjoy the extra battery. The only time I'd want 1440p is when watching video's or movies. Is there anyway to change the resolution completely or have it switch back when apps are open like youtube or netflix? I will be getting an unlocked version so I can root.

Logan0829 said:
Hey! I'm getting my pixel 2 XL tomorrow and have been looking around to see if I could change the screen resolution at all. (like on samsung phones) I feel like I'd be okay with 1080p as it's all I've used on oneplus phones for the past 4 years. I'd enjoy the extra battery. The only time I'd want 1440p is when watching video's or movies. Is there anyway to change the resolution completely or have it switch back when apps are open like youtube or netflix? I will be getting an unlocked version so I can root.
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Don't bother. In an informal test conducted late last year it was shown the power savings was only a few minutes, with those power savings solely due to a reduced workload for the GPU, and thus not worth the effort. So enjoy the screen as is.

Examples of some videos on OP7T

I got this phone hoping that the quality of my concert recordings would look better than the aging nexus 5x I had. I did a couple recordings last night. Ill update it later as soon as the other two videos update. Couple things happened. During the first show it was brighter in the room and it looked better. I accidentally swiped on the phone and it ended the recording. That was frustrating when it happened and the first bands recording got cut in half. I tried using the shake free mode or whatever it was called on the first band to try to save battery. The second band got on stage and I switched it to the 4k mode. I paid no attention to the warning that popped up when i started recording. The video ended after five minutes and I wondered what the heck happened. I started recording again and noticed the warning that 4k only records 5 minutes at a time. After that I switched over to the hd stable mode. The show was quite a bit darker and the video quality was not the best. Audio was fine on all the recordings though.
So I went home and uploaded the videos... first thing I noticed was the 4k video was sideways... I held the phone the way I was supposed to... I have no idea why it recorded sideways. Thats a little annoying because i dont have the tools to fix it.
https://www.youtube.com/watch?v=MVdwS6VYXmc - 5 minute 4k recording... sideways
https://www.youtube.com/watch?v=5o-zewwU5aE - 71 minute "stable" HD recording

How to set 25fps?

So just got the phone a couple days ago... And im trying to figure out why im stuck in NTSC frame rates.
Im from the UK so obviously i prefer the look of 25FPS and when i do content I work in 25 fps.
It really seems strange that the cameras are arbitrarily locked to US frame rates.
Is there anyway to get 25fps?

NutsyUK said:
It really seems strange that the cameras are arbitrarily locked to US frame rates.
Is there anyway to get 25fps?
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Yes can be annoying. Cannot change it in the stock camera APP AFAIK. But other apps like Open Camera for example will allow you to set the FPS to 25fps.
It's likely just not as important as it once was... Unless you are specifically playing back on a older interlaced television set, than the chances are that item you are watching the video back on will support it regardless..
i.e Most phone, laptop and PC screens are running at 60hz, and most TV's will handle 24/25/30 fps intervals without issues these days.
Most people are uploading to youtube or online where by 30/60fps make more sense. 25fps is a leftover from the interlaced broadcast TV days. So the only difference it would make is if you shoot at 30fps and then need to broadcast it at 25fps, in which case you would have 3:2 pulldown.
The standard camera app does allow flicker/banding to be set to 50hz/60hz/Auto thus not to have strobing light issues.
But is there a specific reason you want to shoot 25fps and not 24/30/60?

Having worked in video production for much of my working life, I cant say i fully agree. While sure 30fps is common thats only because most content on youtube is from the americas where 30fps was common
It isnt just a hang on from the interlaced days either. A lot of american shows were actually shot on film at 24 and 25fps and then upsampled to 29.97 fps (or there abouts) 24 and 25fps have a more filmic and natural flow than 30/60.
Even today nearly all dramas and filmic shows in america are filmed at 24 and 25fps. With only soaps and news hanging onto 30fps.
Ive also tried open camera, even though the "option" is there, when i watch the footage it comes back at 30fps.
So its like its baked into the hardware encoder. Its really stupid though. Its not like its a limitation of hardware, not being capable of producing that frame rate because its too complex... Its as if just a config option or api is missing.

NutsyUK said:
While sure 30fps is common thats only because most content on youtube is from the americas where 30fps was common
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I'm from Australia where we also use PAL25FPS, because of 50hz electricity same as you in the UK, but any PC screen or monitor or phone for the last however many decades default is 60hz. Which is why 30/60/120fps makes more sense all around the world.
If YouTube was a British TV program being broadcast on TV, than 25fps would make more sense. But because it's being viewed on monitors, phones, laptops, tablets etc, than 30fps ensures no extra/interpolated/missed frames etc.
Even today nearly all dramas and filmic shows in america are filmed at 24 and 25fps. With only soaps and news hanging onto 30fps.
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Motion pictures have always been shot at 24fps, but TV in PAL countries has indeed been shot at 25fps, while US (NTSC) TV shows are shot @ 30fps.
I've also tried open camera, even though the "option" is there, when I watch the footage it comes back at 30fps.
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Ahh, I didn't actually test it, I just remember the setting... GCAM ports will definitely let you shoot [email protected] (as well as 30/60).
So its like its baked into the hardware encoder. Its really stupid though. Its not like its a limitation of hardware, not being capable of producing that frame rate because its too complex... Its as if just a config option or api is missing.
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I agree the option would be good. But at the same time it's likely not as important as it once was. Many years ago I required 25fps for broadcast TV, but these days it's simply not required. I cannot really see a use case where it matters anymore.
It really is a leftover from interlaced fields, and now days screens are capable of progressive scan.
If you are intending on shooting for broadcast TV with this phone (which seems odd) you no doubt would be editing in post, and thus would convert the 24/30/60fps footage to match your 25fps timeline in post, which would automatically do a 3:2 pulldown or pullup to convert the frames anyway.
If they did offer 25fps, there would be lots of complaints from people wondering why their footage is stuttering and jumping, when played back on their phone, PC, Chromecast, Youtube etc... Which I think is why they don't like to offer it.

Sadly even the best 3:2 pulldown can cause ghosting and artifacts, but I also plan to do some VFX as well, so for things like tracking thats a real killer...
Also im sorry youre wrong many shows in america (assuming they expect to sell internationally) always shoot at 25. Startrek for instance was shot at 25fps on 35mm.
And also when rendering out FX sequences, that extra 5 frames per second really add up.
Id rather keep to 25 for the aesthetics, and the ease of workflow.
I wonder if the framerate is something baked into the firmware of the camera hardware.