Top Ten Things Techies Wanted to Know About the 5G iPod | iLounge Article


Top Ten Things Techies Wanted to Know About the 5G iPod

In our previous article, Top Ten Things You Wanted to Know About the 5G iPod, we looked at issues that were of concern to the “average” iPod owner. But as we’re keenly aware, iLounge also caters to a sizeable group of techies - audiophiles and videophiles - so we wanted to share some other details that are more of interest to such readers.

10. Noise Defect: Gone. In the first of three key audio improvements we’ve noted, the 4G iPod’s infamous hard drive and static noise audio defect is now gone in 5G. Initially obvious in black-and-white 4G iPods, the noise had become hard to notice in color 4G iPods unless using high-end headphones. Now, even using $900 Ultimate Ears UE-10 Pros, the noise isn’t there.


9. Bass Performance: Improved. The second of three key audio improvements is that the 5G’s bass response has definitely improved over the color 4G. Audiophiles have previously lamented a lack of “bass power” in earlier iPods, as well as readily apparent distortion when the iPod’s “Bass Booster” equalizer is turned on. In testing with a collection of lossless tracks and the UE-10 Pros, small but noticeable enhancements of the bass are definitely apparent, giving tracks an inoffensively warmer sound. With Bass Booster turned on, distortion is not absent in the 5G, but is definitely lower, and has a smoother, less mechanical edge.

8. Piano Solos: Clean. The third of three key audio improvements is what appears to be a complete fix for a “piano solo distortion” issue in 4G iPods recently identified by iLounge readers. Previously, in certain tracks, distortion (a light sizzling) could be heard around the silent edges of piano notes. Comparative testing with one of the sample identified piano tracks (“Bladiator”) shows that the distortion has been completely eliminated.

7. Video FPS: Over 30fps is Possible. Video playback appears not to be capped at 30fps (frames per second) as suggested by the new iPod’s technical specifications - rather, the iPod’s limitations appear to be bitrate and bandwidth. We were surprised to discover that QuickTime Pro 7 had taken a 50fps original video and created an “iPod ready” 46fps video from it. The video then played back on the iPod at something equal or close to 46fps - certainly higher than 30fps. How? It was formatted for 320x180 rather than the iPod’s 320x240, 30fps maximum, and QuickTime 7 Pro took advantage of its extra capacity for a higher frame rate.



6. 2 Hour Video Playback on 30GB iPod: Conservative Estimate, At Least Output to TV. We had our 30GB model play back loops of the movies Hero and House of Flying Daggers for 3 hours and 10 minutes before its battery died. We’ll see how the iPod does through on-screen playback, but so far, it’s doing better than it could have. Why is this? Quite possibly because there’s no need for backlighting during TV output. Regardless, it’s good news.



5. The iPod’s Screen: Comparatively More Detailed than Many Screens. Thanks to our own Jerrod H., we have a preliminary DPI table comparing the 5G iPod’s screen DPI (dots per inch) to that of other iPods and noteworthy devices. Why does this matter? It explains why the iPod’s screen looks so detailed by comparison with most other devices you’re accustomed to using. The higher the DPI number, the more detail is packed into every inch of screen size.

Apple Cinema Display 20”: 99.05dpi (20” screen)
Apple Cinema Display 30”: 101.6dpi (29.7” screen)
Original Black and White iPods (1G-4G): 102.4 dpi (2” screen)
Apple iPod mini: 105.7 (1.67” screen)
Sony PlayStation Portable: 128dpi (4.3” screen)
iPod photo/color/4G: 141 dpi (2” screen)
iPod nano: 147 dpi (1.5” screen)
iPod 5G: 160 dpi (2.5” screen)
Creative Zen Vision: 216dpi (3.7” screen)

Is detail really that important? Depends on your perspective, and other factors are important, too. For example, we feel pretty certain that the iPod’s smaller, lower-resolution screen will be liked by more people than the Zen’s bigger, higher-detail screen because of viewing angle alone.

4. 320 Is Better Than 480 - on iPod’s Screen. Unfortunately, but not surprisingly, videos in 320-pixel MPEG-4 format are noticeably superior to ones created in 480-pixel MPEG-4 format when viewed on the iPod’s screen. Because the screen doesn’t have the pixels to display all the detail of the 480 version, the iPod scales it down, creating a slightly softer image in the process, and one that is not as smooth in frame rate, either. The 320-pixel versions look crisper because they have been optimized on a per-pixel basis for the iPod, and smoother because the iPod’s processor doesn’t have to waste power and time resizing every frame.



3. Brightness. The iPod’s lack of an adjustable screen brightness level has two consequences: it looks highly viewable at all times (except when the backlight is off) by comparison with other handheld devices, and it also drains more battery power whenever the light is on. Sony’s PSP, by comparison, can use 4 different brightness settings - the maximum only if the unit’s been plugged into wall power - and Creative’s Zen Vision can go through 10. In the video era, an adjustable brightness setting may be an appropriate addition to the iPod’s settings menu.

2. Hard Drive and Power Management. Even more than in the past, the iPod’s hard drive appears to be very aggressively trying to manage power consumption by turning on and off only as absolutely necessary. You’ll hear physical clicks when this happens, as with earlier iPods, but not in the headphones. It’s unknown what impact, if any, this will have on the drive’s longevity, or whether Apple worked with its hard drive supplier to anticipate this, as constant running of older iPods’ hard drives was said to be an easy way to burn them out. On a side note, video playback from the hard disk is not instantaneous: it takes around 5 seconds from the initial click of your button to start a clip playing.



1. Easter Eggs. Hidden at the bottom of the iPod’s Legal screen is a tiny icon of a snowman. Apple reps tell us that it’s an insider reference to one of the iPod development teams, which wanted to leave its mark someplace on the iPod. That’s where it is.

« iTunes and iPod video format compatibility

Top Ten Things You Wanted to Know About the 5G iPod »

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Nice to see the 480x480 MPEG4 issue I commented yesterday clarified. But what about quality when played through a big screen (TV)? I’m still curious as how good the iPods videoprocessor is at presenting video on an external screen. A comparison between an iPod and a regular Mac with video out on a TV would be nice to read about.

Keep up the good work, lot’s of interesting stuff in this article…

Posted by cubeXpert in East Amherst, NY, USA on October 18, 2005 at 7:01 PM (CDT)


thanks for all the detail guys. very cool of you, and very helpful.

Posted by mrfett in East Amherst, NY, USA on October 18, 2005 at 7:23 PM (CDT)


Is this thing gapless yet?  Or are the gaps smaller?

Posted by tellemstevedave in East Amherst, NY, USA on October 18, 2005 at 7:55 PM (CDT)


Same question - are the gaps smaller? How long are they for MP3?

Posted by vanhalen26 in East Amherst, NY, USA on October 18, 2005 at 8:26 PM (CDT)


BTW - Gap lengths of the X5 are as follows and curious how Ipod compares - particularly on MP3

(Was posted on iaudiophile forums with an attachment to listen to)

Gap lengths:

Wav - 0.002
Flac - 0.044
WMA - 0.061
Mp3 - 0.098
Ogg - 0.689

Posted by vanhalen26 in East Amherst, NY, USA on October 18, 2005 at 8:47 PM (CDT)


i would also like to know more on cubeXpert’s question… how good are the ipods videoprocessor at presenting video on external screen?? what is the best “pixel” size for viewing the movie on a tv?

Posted by erwin_mayer in East Amherst, NY, USA on October 18, 2005 at 9:01 PM (CDT)


What about the dynamic updating of smart playlists?  Does that work on the new ipods?

Posted by mpb2000 in East Amherst, NY, USA on October 18, 2005 at 9:22 PM (CDT)


As an update to my question, someone tested the dynamic updating of smart playlists and it does work on the 5G.

Posted by mpb2000 in East Amherst, NY, USA on October 18, 2005 at 9:38 PM (CDT)


I’ll third the request for info on how video looks through the tv out. This had to be pretty high on the list of things people wanted to know.

Posted by timpone in East Amherst, NY, USA on October 18, 2005 at 10:10 PM (CDT)


Video through the TV-Out is acceptable but not great. If you’re expecting a DVD transferred to iPod format to then look DVD quality, you’ll be very disappointed. We’re in the process of comparing the various types of output and will have more to say soon - we encoded the same footage in different ways to see what the differences are.

One thing to note: we are seeing video tearing (or something similar) on the 5G during certain fast-action scenes in House of Flying Daggers. It appears to be happening during 320 pixel-encoded video but not 480 pixel-encoded video. Stay tuned.

Posted by Jeremy Horwitz in East Amherst, NY, USA on October 18, 2005 at 10:58 PM (CDT)


More questions:

1. So, is the headphone output = the shuffle?

2. Do videos encoded with Nero Recode with the PSP preset playable?

3. Does it have the infamous VBR MP3 problems that was known on the 2nd gen minis and nanos?

4. How good/bad is its bettery draining? (how fast the battery is drained when the unit is not used? Can it retain juice for not being used for 3 to 5 days?)

Posted by pika2000 in East Amherst, NY, USA on October 19, 2005 at 1:40 AM (CDT)


Here are better answers on video output. Can’t answer every question here, but we’re working on more.

On the iPod’s screen, 320-formatted video appears to be the way to go. But as TV output, video encoded with Handbrake for 320 pixels in either MP4 or H.264 looks truly terrible - cubic. Video encoded with Handbrake as 480 pixels in MP4 is a step up for TV output, but still not acceptable by our standards when output from the iPod. As with 480 pixel output to the iPod’s screen, the frame rate takes a hit, but there is definitely more detail in the video.

There appears to be more to this than just pixels, though. Just as we saw in iTunes 6’s preview window, there is a difference in apparent encoding quality (or something else being hidden from the user) between the 320 pixel music video we downloaded from iTunes, and the 320 pixel TV show. While supposedly the same dimensions and encoding standard (MP4), the TV show looks better as TV output than the music video,  just as when watched through iTunes. It seems likely that better-optimized settings were chosen for the TV show, and that iPod and TV output quality would improve if those settings were also applied to both music videos and user-generated content.

Our tests continue. :-)

Posted by Jeremy Horwitz in East Amherst, NY, USA on October 19, 2005 at 1:54 AM (CDT)


i would like to know about pika2000’s #2 question.  Would a program that lets me encode video to 320 x 240 in .mp4 format for a PSP work for an ipod too?

Posted by Edmond Dantes in East Amherst, NY, USA on October 19, 2005 at 2:16 AM (CDT)


So, with all these audio improvements I take it the 5G definatly doesn’t use the buggy decoder of the photo/colour? My photo is gathering dust at the moment because of the mp3 vbr bug.

Has someone popped the lib on a 5g to find what’s inside, is it the rumoured Sharp chip?

Posted by ailean in East Amherst, NY, USA on October 19, 2005 at 5:35 AM (CDT)


The owners at Small Dog indicated early that the 5G iPod can record in 44.1 stereo. I’m not seeing that anywhere else. Was he wrong? Or is this just something that Apple’s not saying too loudly?

Posted by cmrjkm in East Amherst, NY, USA on October 19, 2005 at 8:55 AM (CDT)


Good Article.. I guess I want to know more details like, what is the ipod using as a DAC (wolf ?) and there a new portaplayer chip used?  I guess I want to see what is going on inside.

Posted by chrisfromalbany in East Amherst, NY, USA on October 19, 2005 at 11:28 AM (CDT)


Thanks for the extra video info. Are you saying that you haven’t been able to encode your own content at the same quality level as itms tv shows? So do itms tv shows then look fairly acceptable?

Posted by timpone in East Amherst, NY, USA on October 19, 2005 at 11:42 AM (CDT)


this techie needs better info on what you mean
by “480-pixel” video—would that be
480x360 at the same aspect ratio, which
would make a big difference for the interpolation?

is it apple .mp4, better apple .mp4 in a .mov container,
or arbitary 3ivx / divx.  what settings?

is the source pristine RGB animation
with fine lines (or text movie credits, known
difficult material), resized by good rescalers
like QT pro or photoshop, or some
non-square pixel YUV DVD stuff randomly
output by a non-apple codec?

the devil being in the details, all i see from
the description is that resizing yields something
“softer”, generally true of bilinear/bicubic
downsampling—at least it doesn’t seem
yucky like nearest-neighbor or just throwing
away pixels.

humble suggestion—stick with line-art-based
apple QT-pro output at “best” settings,
resized only once, for the initial resolution testing.

Posted by retiarius in East Amherst, NY, USA on October 19, 2005 at 11:55 AM (CDT)


hmm, since a teardown shows a broadcom 2722
chip jammed in there, the specs only hint at
“pixel-level interpolation”.

if the video-out is done *after* the rescaling,
it may be amazing to see 480x480 anamorphic
material letter-boxed correctly on the ipod
and nicely expanded on a tv at wide-480p,
probably the best that analog S-video can do.

Posted by retiarius in East Amherst, NY, USA on October 19, 2005 at 12:38 PM (CDT)


any info on the new DAC used in the 5 gen ipod. WM8758.  That is different then what was used in the Nano.  Hoping for better SQ.

Posted by chrisfromalbany in East Amherst, NY, USA on October 19, 2005 at 2:47 PM (CDT)

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