Video: Finally High Profile H.264

Section by Brian Klug

There are a few things different with video capture on the iPhone 5 thanks to improvements to both the ISP inside Apple’s A6 SoC, and also software UI changes. First off, because the iPhone 5 display is now 16:9, there’s no cropped view by default or aspect-correct view with letterboxing for video capture. Instead the iPhone 5 video capture window takes an iPad-like approach with transparent UI elements for preview and shooting video.

What’s new is the ability to take still images at 1920x1080 while recording video by tapping a still image capture button that appears while recording. This is a feature we’ve seen onboard a ton of other smartphones and works the same way here. Note that you can’t magically get a wider field of view or the whole CMOS area while shooting video, it’s essentially dumping one frame from video capture as a JPEG instead of into an H.264 container.


In addition the iPhone 5’s tweaked Sony CMOS still uses a smaller center region for video capture. The difference in field of view is pretty big, but nothing that users haven’t already dealt with in the past.

The iPhone 5 brings two main things to video capture. The first is improved electronic image stabilization tweaks and improvements to ISP. The difference is visible but not too dramatic unless you know what you’re looking for. I would wager most users won’t notice a huge step forward from the 4S but if you’re using an iPhone 4 this will be a marked improvement.

The other improvement is video encoding. The iPhone 5 now shoots rear facing 1080p30 video at 17 Mbps H.264 high profile with CABAC. This is a huge step in encoding from the relatively absurd 22–24 Mbps baseline H.264 that the iPhone 4S would shoot at 1080p30. The result is vastly more quality per bit on the iPhone 5, for a big reduction in storage space per minute of video. I did some digging around and found that the A6 uses an Imagination Technologies PowerVR VXE380 for encoding and VXD390 for decoding, which is what I thought was in the previous SoC as well but perhaps wasn’t clocked high enough for encode at high profile. This brings the iPhone 5’s encoder on paper up to match what I see other smartphones running their 1080p video at as well (17 Mbps high profile).

On the front facing camera Apple is shooting 720p30 at 11 Mbps H.264 baseline, as opposed to the VGA at 3.5 Mbps that the 4S shot. Interestingly enough both front and rear shooting modes still are just mono audio, 64 kbps AAC. I would’ve liked to see stereo here since almost all the competition is shooting stereo, and it’d put those 3 microphones to use.


To get a feel for video quality, I stuck my iPhone 4S and iPhone 5 in my dual camera bracket with pistol grip and made a series of three videos. I then combined them and put them side by side for ease of comparison. I’ve uploaded the result to YouTube, but you can also grab the original videos (548 MB zip) if you’d like from the site directly without the transcode.

Overall the most dramatic improvement is the front facing camera, which is obviously night and day. Better image stabilization is noticeable while I’m walking around being intentionally shaky, but nothing hugely dramatic. The main rear facing video improvement seems to be an increase in sharpness (watch the power lines and wires in the native resolution version) and slightly wider field of view. That’s to say nothing of the fact that this quality comes at a bitrate that’s lower than the previous version but with better encode settings.

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  • doobydoo - Friday, October 19, 2012 - link

    'Right, so if you have good vision, like I do, then at a foot away, you can see those pixels.'

    If you can see that then you would also be capable of observing that the SG3 doesn't have full pixels, it uses a PenTile display which overall has fewer sub pixels over a greater area than the iPhone 5 screen, making it both absolutely lower quality and relatively lower quality per area.
    Reply
  • KoolAidMan1 - Friday, October 19, 2012 - link

    You can discern individual pixels on an iPhone 5 display?

    Lies.
    Reply
  • dsumanik - Wednesday, October 17, 2012 - link

    Im sure this guy said the same thing when the 4 came out...3.5 was "big enough"

    Just watch when apple adds an even bigger screen he will be saying it is "perfect"

    The problem with iSheeps is that they need to get out there and actually use a different phone from a different ecosystem for a month, then switch back.

    Apple's devices are well built and tightly integrated, but there are serious shortcomings, drawbacks, and flaws that you will notice once you return to the platform.

    That said,

    Personally i purchase apple products due to the insanely high resale value, which allows me to keep up with new gear on a yearly basis for a reasonable price.

    Sent from my iphone 5
    Reply
  • khurtwilliams - Thursday, October 18, 2012 - link

    "iSheeps"? Must you resort to name calling to make your point? Reply
  • rarson - Thursday, October 18, 2012 - link

    "Personally i purchase apple products due to the insanely high resale value, which allows me to keep up with new gear on a yearly basis for a reasonable price."

    I don't see it. Maybe if you buy the newest thing as soon as it comes out and sell your old last-gen device that most people are still happy with, then you're selling it for a decent amount, but you're still spending way more money than any reasonable person would. There's absolutely no monetary argument to buy Apple products, because if money is your concern, then you shouldn't be buying them in the first place.

    Apple's phone prices are much closer in line with their hardware; for laptops and desktops, the resale value argument goes WAY out of whack.
    Reply
  • darwiniandude - Friday, October 19, 2012 - link

    I bought an early 2011 MBP last year for $2650 AUD. got a high res screen option etc. I heard rumours of the retina model and sold it just before the 12 months was up so the new purchaser still had a little warranty me could buy AppleCare if they wished. I sold it for $2300 AUD. This means I lost $350 over the year, it cost me $350 to have that machine for a year. I didn't buy AppleCare ($429 AUD) either.
    The retina model came out, and retailed for $2499 AUD

    I've been doing this since my first Mac, in 2006. I can't believe the crazy used prices on Macs especially if they are still current model and about a year old. I pay about $300-$400 a year to have the latest and greatest and a machine that is always in warranty. If I bought a cheap PC notebook for $400 I'd be suffering with an underpowered plastic machine with little ram, no SSD, and it might last more than a year but I wouldn't be happy with it anyway. Each to their own. I could never stay current with PCs because a year later the system was next to worthless, even if I'd put a $1000 video card in it at the time. (I now, reluctantly, game on consoles or a little in bootcamp)
    Reply
  • david22 - Thursday, October 18, 2012 - link

    "there are serious shortcomings, drawbacks, and flaws"

    So what are they?

    The problem with trolls is that they just spout bull.
    Reply
  • MobiusStrip - Friday, October 19, 2012 - link

    Apple refuses to pull its head out of its ass or LEARN. One profound impediment to making iOS devices useful is Apple's ridiculous fear, which you can see in its crippled SDK. One example: the lack of developer access to the dock port.

    But then there is just plain stupidity. There's no excuse for bullshit like this: http://goldmanosi.blogspot.com/2012/06/will-apple-...
    Reply
  • darwiniandude - Friday, October 19, 2012 - link

    Um, when someone calls me and I miss the call, iPhone shows a missed call. Then my carrier (Telstra) sends me a text message "You have a missed call from 0412xxxxxx" then "Please call 101 you have 1 new voicemail(s)"
    I get multiple alerts for both those SMS messages.
    Reply
  • rex251 - Sunday, October 21, 2012 - link

    Why going all the way in calling people that like apple products as sheeps?
    I think you should accept the fact that some people like small phones, and maybe like small smartphones, which neither iphone5 or sgs3 are.
    From my perspective iphone 4/4s screen was maximum I would go with something called phone into my pocket, but I do not, instead finding xperia mini great sized, although too thick.
    My point, why would we have to considere as progress only bigger screen phones as such, we do have plenty of tablets to pick from for that usage?
    Reply

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