:?
Hello,
i find photos made by the xda II at a resolution of 640*480 have visible artefacts. Photos at 320*240 don't have them that strong. That makes me think that the 640*480 might just be interpolated?!
Or is the compression too high? Is it possible to change the strength of the compression?
thanx
Related
Hi guys
I think Xperia doesnt really capture videos in VGA @30fps
I had a nokia n95 8gb and the videos were waaaay better.
but not only that
i recorded in vga mode a 40s video and that was 2.4MB that means around 60KB/s and that means 2KB per every frame.?????!!!!! if there are 30 frames per second.(and not forget that there is also the audio so the frame size is lower than 2KB)
The funny thing is that the video size IS 640x480. so in my opinion
the videos are caught in a low resolution for example 320x240 every frame gets interpolated to 640x480 and then saved as video.... could this be true ??? what do u think.
I don't know the details but most mpeg encoders deal with I and P frames. Something to do with they take a full frame picture, and then for the next x amount of frames encode only the delta between succesive images, then another full frame I.e. if the image does not change much, then not much data will be used as there has been not much change... etc
even if the X1 takes video at 640x480 and 30fps that doesnt say anything about the quality of the chipset, which quite crappy if you ask me. Video recording quality is horrible for such an expensive device.
man, it's seem you know nothing about video encoding and you complaint x1's capacity is fake. the msg above is correct and that's why action movie normally bigger in size due to massive different between frames. there are other tricks (color pattern), algorithm and compression to reduce the size even futher
The problem is the cmos camera - not the pixels at which it is stored.
Like most mobile phones, the cmos for capturing the image is too small and not sensitive enough, therefore the quality is usually crap! and it doesn't matter what resolution you store the image/video as, cause the source was crap to start off with.
informatico said:
Hi guys
The funny thing is that the video size IS 640x480. so in my opinion
the videos are caught in a low resolution for example 320x240 every frame gets interpolated to 640x480 and then saved as video.... could this be true ??? what do u think.
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I thought so at first too, since the quality was so bad in VGA-mode. But if you record a video of a motionless view and hold the camera very still you will see there is a difference between QVGA and VGA. So I think the bad quality in VGA-mode is the result of very hard compression.
I really hope they fix that.
yeah ... you're right
I just noticed something that i find a bit weird, even though it supports my previous statement.
I recorded two videos with the X1. They are almost exactly the same length (it differs less than a second), and the scenes are also identical. One is VGA and the other is QVGA.
Since the size of VGA is four times bigger than QVGA I would expect the VGA recording to have a bigger file size. Maybe not four times bigger, but at least clearly larger.
But actually the QVA recording was slightly bigger. Only 40 kB though, so they are basically the same size.
No wonder we experience the VGA recording to be of low quality.
Just wondering what resolution the camera captures video at? Still 320x240 or is it any better?
gerryr said:
Just wondering what resolution the camera captures video at? Still 320x240 or is it any better?
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352x288 in MPEG4
Thats a pity, had an Acer WM device for a bit that took VGA video, anything less isn't really worth editing on a PC.
Thanks for the info
gR
Do you typically record 720p or 1080p video? I use 720p because the files are smaller and I own a 720p tv. I wondered if 720p might offer better quality in low light conditions because it can average over more pixels in the sensor?
Also if the phone cpu is working too hard at 1080p does it reduce quality by upping compression and increasing lossyness?
Or is 1080p substantially better choice with the only downside being bigger files?
Generally I've found video IQ to be some what independent of resolution (on other devices) because compression generally goes up with resolution negating a lot of the benefits.
Thoughts?
Im using 720p cos it seems to me more clear and more smooth playing...plus less zoom.....
Sent from my GT-I9100 using XDA App
So 720p plays back smoother? Just on the phone screen or over hdmi?
Sent from my GT-I9100 using xda premium
jdurston said:
Do you typically record 720p or 1080p video? I use 720p because the files are smaller and I own a 720p tv. I wondered if 720p might offer better quality in low light conditions because it can average over more pixels in the sensor?
Also if the phone cpu is working too hard at 1080p does it reduce quality by upping compression and increasing lossyness?
Or is 1080p substantially better choice with the only downside being bigger files?
Generally I've found video IQ to be some what independent of resolution (on other devices) because compression generally goes up with resolution negating a lot of the benefits.
Thoughts?
Click to expand...
Click to collapse
You are right, due to the binning would select the less noisier pixels and thus, the 720p video quality [except for resolution ofc ] would be much better.
I prefer 720p mode, only because of the field of view, it's just too narrow angle in 1080 mode.
Suppose it could come in handy if wanting to shoot something more distant but for indoor work it's not wide enough.
Sent from my GT-I9100 using XDA App
For me only 720p, because in 1080p I get a thin, purple line over the image that's also recorded into the vid, making my 1080 mode effectively broken.
I always thought 1080 as higher quality than 720p. Maybe for mobile this is different? Any source or test for this?
I'll try and shoot some comparison footage tomorrow.
Not sure if YouTube's compression will make the difference impossible to tell though.
Si14 said:
I always thought 1080 as higher quality than 720p. Maybe for mobile this is different? Any source or test for this?
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This is a totally different matter. Yes, 1080 pixels are "higher" than 720, obviously . But there are other factors also on our device.
I just record in 720p. Never really compared the two, but I don't need 1080p usually, so I' don't need those huge files either.
Good discussion on here, guess I'll have to switch to 720p now on.
I tried recording an apple in the 2 modes and to my surprise the 720p mode is indeed much clearer and wider then 1080p.
Go for 720p
I prefer 720 p... for my the quality is enought and the size of the videos is so better.
Regards
Anyone knows how I can change the bitrate and frame rate of Samsung s4 video? Its too big.... 100 mb /1 min..... I don't need 12 Mbit at 50 fps
I also have the same concern as you as I think the bitrate is too high though it is at 30fps. I think at 1080p it is 17000kBps.
I hope there's a way to change the bitrate without having to sacrifice the frame size as 240p has a lower bitrate but it is too small.
For example 1080p at 2MBps would be very fine for me.
scarookie said:
I also have the same concern as you as I think the bitrate is too high though it is at 30fps. I think at 1080p it is 17000kBps.
I hope there's a way to change the bitrate without having to sacrifice the frame size as 240p has a lower bitrate but it is too small.
For example 1080p at 2MBps would be very fine for me.
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I was using 720p. It was recording at 60 fps at 17mbit. 400MB for 4 min. ridiculous!! much appreciated if someone can help out with a way to change bitrate and framerate setting.. thnx
wildpig1234 said:
I was using 720p. It was recording at 60 fps at 17mbit. 400MB for 4 min. ridiculous!! much appreciated if someone can help out with a way to change bitrate and framerate setting.. thnx
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Yep, considering the fact that for 400mb you can re-encode a full movie of good quality.
So anyone has any trick or hack they can share to change bitrate and framerate? on my old Touch Pro2 it was just a quick easy change to the registry. I figure it should be that easy on S4? I mean i can't be the only one feeling that the video on S4 is using way too much bitrate and size?
So no one thinks that the filesize is too big or has any interest in reducing the filesize?
I also think the video files are way too big even when set to 1280x720. I use Handbrake on my PC to reduce the size. It would be even better if someone could find a way to reduce the bitrate it records at.
vpwrf said:
I also think the video files are way too big even when set to 1280x720. I use Handbrake on my PC to reduce the size. It would be even better if someone could find a way to reduce the bitrate it records at.
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So no one got any way to reduce the bit rate of video recording on the s4?
Hello guys
Looking for the best way to make video with a Note 3
- High bitrate
- Low contrast for color grading in post-prod
- High amount of detail
- 24p
- 1080p or downscaled 4K (I don't know which one would look better)
What do you think ?