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Help Video Frame Rate

RonaldH

RonaldH

Member
My Nexus 7 2013 WiFi tablet shows a frame rate for video varying between 20-23 fps on recorded video properties. Is this correct because I get video judder? Can it be adjusted?
Thanks
Ron

Found some answers ... auto adjusts, partly due to high noise in low light capture ... and that there seem to be issues in more recent Android versions. Is there anything one can adjust?
 
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Thanks. I don't plan to go backwards from 5.0.2 because I do like it's features. Tablet video is not used much by me (I have a camcorder) but it is handy to use as a standby.
Since it is a software issue is there any way to find out if Google/Android plan a fix?
Ron
 
It's more a low light issue.

Less light equates to more processing time to get the frames out of the sensor and processed.

If your processors are busy doing other things, yes, that can slow it down.

But typically not by much.

And the noise won't change.

To increase your frame rate in low light, choose a lower resolution.

Less to process = more frames per second.

Max at 1080p is 30 fps.

Dial it back to 720p.

With the low light noise and low frame rate anyway, you're not losing a thing because of dots of resolution in comparison.
 
Thanks for your advice. This morning I have been able to capture some video in full sun at both 1080p and 720p. Whilst there is some improvement due to 30fps capture, the result is still jerky. So maybe it is an issue with the bit rates?

Settings tried:
1920x1080 30fps Bit rate 9Mb/s
1280x720 30fps Bit rate 6Mb/s

Processor appears not to be busy.
Ron
 
That 24 fps (24 Hz) they talk about in movie theaters is shuttered to 48 Hz (each frame is flashed twice) to get past your flicker fusion threshold so you see movies instead of fast pictures.

An LCD display flickers the backlight to accomplish it at a much higher rate.

24 fps isn't a great truth. That's really the bare minimum to get by and came from a time when movies were being invented.


30 fps came from interlaced TV, half a frame at a time for 60 Hz - matching your line power in the US (50 Hz and 25 fps if Europe.) Again - constant frame rates.

And that's all assuming a constant frame rate.

Your frame rate isn't constant.

And given that 1080p is just over 2 times the data as 720p, but your bitstream for it is only 50% higher, yeah, that means that the 1080p stream is even more variable in its true frame rate from second to second.

So 720p @ 30 fps ought to be smoother somewhat due to less variability.

But it's still not going to cure stuttering at those bit rates.

Can you go lower, to 480p and try for 60 Hz?
 
Reduced to 480p and there is more improvement but still unacceptable ... reasonably OK if you hold the device and do not capture movement but then its just a 'still shot'. The bit rates get down into the 3's. Can't see any setting for changing the Hz factor. Given that this device is supposed to be full HD, one would think that a good result would be obtained at 1080 in bright sunlight at least. Bottom line is that I love the tablet but the video is rubbish so I am hoping that Google Android can do something about in the next release. I don't think that this is an issue with just my tablet ... everything else on it functions just fine.
Ron
 
Tablet cameras in general are pretty iffy. Wonder how the nexus 9 fairs in these same scenarios.
 
Yes, it would be good to get some comparisons of Google/Android tablet video qualities. Maybe they are all rubbish using the later releases! Can't recall what Android release my tablet was on when I purchased it 'new to the market' but I don't recall having unacceptable video capture ... even at the full HD setting. Its a real pity because overall the Nexus 7 2013 is simply brilliant.
Ron
 
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