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Home / Tips and Tricks / These are the slow Mo specifications you should look for in your next phone «Smartphones :: Gadget Hacks

These are the slow Mo specifications you should look for in your next phone «Smartphones :: Gadget Hacks



Nowadays, our phones can only over 30 fps video. Phones like the Galaxy S10 can shoot 4K at 60 fps, even on the front camera. Slow motion functionality has recently begun to appear on more and more devices ̵

1; but as you may have noticed, the quality of functionality differs from telephone to phone.

There are a number of factors that record with slow motion. Specifications that would be ignored for average users while taking video in auto mode. But with slow motion, these specifications are important to know. That because they dictate the result of slow motion video includes how fast that action can be which you slow down. In addition, unlike regular video, it is not the higher resolution is best as for some video rates, there are no options in terms of resolution.

Frame Speed ​​

The most important thing for slow motion capture is frame rate. Slow motion videos are usually created by filming an object at something other than 30 fps (frames per second), and then playing the movie at 30 fps.

For example, if you shoot at 60 fps, then play the movie at 30 fps, you would end up with 1/2 speed slow motion video. This differs from lowering 30 frames per second to 1/2 speed in the post-processing, as it would show each image twice and effectively make the video 15 frames per second – while shooting at 60 frames per second and playback at 30 frames per second would result in the same 1/2 speed video, but each frame would be a new picture.

Of course, you want a camera with higher frame rate. This is often called the "shutter speed" when it comes to still shooting instead of video, but it is the same concept. Look for a phone with at least 240 fps recording, so you get 1/4-speed slow motion when playing at 60 fps or 1/8 speed when playing at 30 fps. But some phones today can shoot as high as 960 fps (marketed as "super slow motion"), like the Galaxy S10 or Sony Xperia 1.

Resolution

] The next important specification to be aware of is the resolution that each slow motion setting will record – for example, 240 fps at 720p . Recording your slow-mo clips with a higher resolution such as 1080p will capture more detail and thus have better video quality. But with the increased pixel depth comes larger file size, which can quickly exceed the capabilities of current smartphones.

Telephone processors must be energy efficient to ensure that the battery can be all day, so they are usually not the most powerful. Processing all the information in a high-definition video in real time becomes an even harder job when you ask the chip to make a whole 2 megapixel photo 240 times per second. Therefore, most smart phones are limited to 120 frames per second when recording at 1080p.

Currently, Qualcomm Snapdragon 855 is a processor selected for Android flagship in 2019. It is a "SoC" or System on a Chip, which means it includes associated processors such as GPU and image signal processor (ISP) used in videography. Although this is a state-of-the-art chip, it is limited to 120 fps at 1080p. It can be both 480 fps and 960 fps, but at 720p and only for a limited time.

This limitation is shared by both Apple's A-series and the Huaweis Kirin chipset. Therefore, consider the medium you share this video with. If your audience is watching a larger screen like a TV, 720p will not look great with many who have upgraded to 4K (2160p) models. But for a more mobile audience, 720p will not look nearly as bad.

Duration

While not a hardware spec, it is important to consider the duration of the event. As mentioned before, our phones are not intended for super slow motion video. For iPhone users, slow-motion videos are limited to 1080p at 240 fps, which is all the A12 chipset can take in real time. Therefore, you can record at 1/8 speed up to the amount of internal storage you have. This is the same for most Android flagships.

But what about super slow motion? Only a handful of Android phones support this feature, and in the US, it is limited to Sony and Samsung. Both companies use a Qualcomm Snapdragon 800 series SoC in their phones and are therefore both subject to the same limitations.

Super Slow-Mo mode on Galaxy S10 allows only 0.4s and 0.8s recording, which only switches between 960 and 480fps recording, respectively. .

Currently, super slow motion video is made using the DRAM buffer. This buffer can temporarily store uncompressed video, which the phone originally uses for 480 and 960 fps videos. When this buffer fills up, the video ends and the phone converts it into a storage file in the internal layer.

The buffer is not that big. Uncompressed super slow motion quickly saves this limited storage space. As a result, on Qualcomm Snapdragon 845 (2018 flagship) you are limited to 0.4 seconds at 480 fps and 0.2 seconds at 960 fps, both of which are recorded at 720p. While Qualcomm Snapdragon 855 doubles both durations, we're still talking about less than a second of action.

Stabilization

Although duration is limited, with a steady hand playing a good action video. While recording in slow motion, the camera's motion is not as noticeable compared to recording at 30 frames per second, but it can still destroy a video if the motion is too large.

Contrary to this, video stabilization is. While optical image stabilization helps a little, in the case of video, the larger factor is electronic image stabilization (EIS). With the EIS system, the phone detects movement from your hands and uses this information to center frames as they are captured. It's much like using stabilizer tools in video editors, but it's more efficient and causes less distortion because it works in direct response to the movement of your hands captured by the phone's sensors.

The problem is that many phones do not include this feature in their super slow motion modes. That is, the only available stabilization is OIS, which again is not as effective for the video . So we strongly recommend that you use a tripod if you know you will capture many super slow-motion videos, which also helps with regular video clips.

Aperture

Finally, there are apertures. Aperture represents the aperture of the lens diaphragm that allows light to pass through. Pictured as f-stop (eg f / 2.2), a lower number corresponds to a larger aperture, which means that more light is taken by the sensor.

Because light is so important with slow shooting, you have a phone with a large aperture that helps in situations when the lighting is not the best. While the high shutter speed limits the amount of light to which the sensor is exposed, a higher aperture can help alleviate any of this by providing a larger aperture each time the sensor is opened.

This article was produced under the Gadget Hacks "special coverage on smartphone-based video creator tips for filming and editing. Don't go through: Why EIS is actually better than OIS for video clips

Cover image and GIFs by Jon Knight / Gadget Hacks

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