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• Manipulating one video into multi outputs with FFmpeg results in no audio in the last output

  27 octobre 2015, par my name is

  Using FFmpeg, I’m trying to do some filtering operations on one input video to scale it (out1), scale and trim it (out2).
  This is the command I’m using :

  ffmpeg -y \
  
  -i "Robotica_1080.mkv" \
  
  -filter_complex "[0:v]split=2[v1][v2]; \
  
  [v1]scale=640:360,setpts=PTS-STARTPTS[vout1]; \
  
  [v2]trim=10:15,scale=640:360,setpts=PTS-STARTPTS[vout2]; \
  
  [0:a]asplit=2[a1][a2]; \
  
  [a1]anull,asetpts=PTS-STARTPTS[aout1]; \
  
  [a2]atrim=10:15,asetpts=PTS-STARTPTS[aout2]; \
  
  [vout1][aout1]concat=n=1:v=1:a=1[out1]; \
  
  [vout2][aout2]concat=n=1:v=1:a=1[out2]" \
  
  -map "[out1]" "1.mp4" \
  
  -map "[out2]" "2.mp4" 

  1.mp4 is ok while 2.mp4 lasts 5 seconds as expected but without audio at all (the QuickTime inspector doesn’t write the audio codec)

  I tried to remove the trim/atrim filters, so the filter_complex parameter looked like this :

  -filter_complex "[0:v]split=2[v1][v2]; \
  
  [v1]scale=640:360[vout1]; \
  
  [v2]scale=640:360[vout2]; \
  
  [0:a]asplit=2[a1][a2]; \
  
  [a1]anull[aout1]; \
  
  [a2]anull[aout2]; \
  
  [vout1][aout1]concat=n=1:v=1:a=1[out1]; \
  
  [vout2][aout2]concat=n=1:v=1:a=1[out2]" \

  but still no audio on 2.mp4

  Can anyone give me a hint ?

  —EDIT—
  This is the output from first ffmpeg command :

  ---

  Mac-mini:~ Luca$ /Applications/XAMPP/xamppfiles/htdocs/MediaGallery/ffmpeg/ffmpeg -y \
  
  > -i "/Users/Luca/Desktop/_TEMP UPLOAD/Video/Robotica_1080.mkv" \
  
  > -filter_complex "[0:v]split=2[v1][v2]; \
  
  > [v1]scale=640:360,setpts=PTS-STARTPTS[vout1]; \
  
  > [v2]trim=10:15,scale=640:360,setpts=PTS-STARTPTS[vout2]; \
  
  > [0:a]asplit=2[a1][a2]; \
  
  > [a1]anull,asetpts=PTS-STARTPTS[aout1]; \
  
  > [a2]atrim=10:15,asetpts=PTS-STARTPTS[aout2]; \
  
  > [vout1][aout1]concat=n=1:v=1:a=1[out1]; \
  
  > [vout2][aout2]concat=n=1:v=1:a=1[out2]" \
  
  > -map "[out1]" "/Users/Luca/Downloads/1.mp4" \
  
  > -map "[out2]" "/Users/Luca/Downloads/2.mp4" 
  
  ffmpeg version N-72460-gc5a07f1-tessus Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
  
    libavutil      54. 23.101 / 54. 23.101
  
    libavcodec     56. 40.100 / 56. 40.100
  
    libavformat    56. 33.101 / 56. 33.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, matroska,webm, from '/Users/Luca/Desktop/_TEMP UPLOAD/Video/Robotica_1080.mkv':
  
    Metadata:
  
      encoder         : libDivXMediaFormat 4.0.0.0578
  
    Duration: 00:00:20.04, start: 0.000000, bitrate: 4282 kb/s
  
      Stream #0:0(eng): Video: hevc (Main), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
  
      Stream #0:1(en): Audio: aac (LC), 44100 Hz, stereo, fltp (default)
  
  [swscaler @ 0x7fb4d181c400] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0x7fb4d185be00] deprecated pixel format used, make sure you did set range correctly
  
  No pixel format specified, yuvj420p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
      Last message repeated 1 times
  
  [libx264 @ 0x7fb4d183f400] using SAR=1/1
  
  [libx264 @ 0x7fb4d183f400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x7fb4d183f400] profile High, level 3.0
  
  [libx264 @ 0x7fb4d183f400] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [libx264 @ 0x7fb4d184e400] using SAR=1/1
  
  [libx264 @ 0x7fb4d184e400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x7fb4d184e400] profile High, level 3.0
  
  [libx264 @ 0x7fb4d184e400] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/Users/Luca/Downloads/1.mp4':
  
    Metadata:
  
      encoder         : Lavf56.33.101
  
      Stream #0:0: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc56.40.100 libvo_aacenc
  
      Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.40.100 libvo_aacenc
  
      Stream #0:2: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.40.100 libx264
  
  Output #1, mp4, to '/Users/Luca/Downloads/2.mp4':
  
    Metadata:
  
      encoder         : Lavf56.33.101
  
      Stream #1:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.40.100 libx264
  
  Stream mapping:
  
    Stream #0:0 (hevc) -> split
  
    Stream #0:1 (aac) -> asplit
  
    concat:out:a0 -> Stream #0:0 (libvo_aacenc)
  
    concat:out:a0 -> Stream #0:1 (libvo_aacenc)
  
    concat:out:v0 -> Stream #0:2 (libx264)
  
    concat:out:v0 -> Stream #1:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  frame=  501 fps= 26 q=-1.0 Lq=-1.0 size=    1512kB time=00:00:19.97 bitrate= 620.1kbits/s    
  
  video:1385kB audio:392kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0x7fb4d183f400] frame I:3     Avg QP:19.30  size:  3879
  
  [libx264 @ 0x7fb4d183f400] frame P:321   Avg QP:24.53  size:  3024
  
  [libx264 @ 0x7fb4d183f400] frame B:177   Avg QP:26.20  size:   825
  
  [libx264 @ 0x7fb4d183f400] consecutive B-frames: 40.7% 34.7%  5.4% 19.2%
  
  [libx264 @ 0x7fb4d183f400] mb I  I16..4: 24.8% 65.9%  9.3%
  
  [libx264 @ 0x7fb4d183f400] mb P  I16..4:  7.5% 10.5%  2.5%  P16..4: 22.9%  7.4%  2.7%  0.0%  0.0%    skip:46.5%
  
  [libx264 @ 0x7fb4d183f400] mb B  I16..4:  0.4%  0.6%  0.3%  B16..8: 17.2%  2.9%  0.7%  direct: 0.9%  skip:77.1%  L0:37.2% L1:51.8% BI:11.0%
  
  [libx264 @ 0x7fb4d183f400] 8x8 transform intra:51.6% inter:69.2%
  
  [libx264 @ 0x7fb4d183f400] coded y,uvDC,uvAC intra: 40.2% 24.2% 1.1% inter: 8.5% 4.0% 0.0%
  
  [libx264 @ 0x7fb4d183f400] i16 v,h,dc,p:  9% 65%  1% 25%
  
  [libx264 @ 0x7fb4d183f400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 29% 16%  4%  6%  6%  7%  6%  6%
  
  [libx264 @ 0x7fb4d183f400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 34% 12%  3%  7%  6%  7%  4%  4%
  
  [libx264 @ 0x7fb4d183f400] i8c dc,h,v,p: 63% 25% 11%  1%
  
  [libx264 @ 0x7fb4d183f400] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fb4d183f400] ref P L0: 69.3% 11.5% 12.5%  6.7%
  
  [libx264 @ 0x7fb4d183f400] ref B L0: 82.4% 16.7%  0.8%
  
  [libx264 @ 0x7fb4d183f400] ref B L1: 98.6%  1.4%
  
  [libx264 @ 0x7fb4d183f400] kb/s:450.44
  
  [libx264 @ 0x7fb4d184e400] frame I:1     Avg QP:22.23  size:  6699
  
  [libx264 @ 0x7fb4d184e400] frame P:78    Avg QP:24.94  size:  2998
  
  [libx264 @ 0x7fb4d184e400] frame B:46    Avg QP:27.93  size:  1036
  
  [libx264 @ 0x7fb4d184e400] consecutive B-frames: 32.0% 56.0%  2.4%  9.6%
  
  [libx264 @ 0x7fb4d184e400] mb I  I16..4: 53.5% 26.6% 19.9%
  
  [libx264 @ 0x7fb4d184e400] mb P  I16..4:  9.8%  7.6%  3.1%  P16..4: 25.0%  8.0%  2.8%  0.0%  0.0%    skip:43.8%
  
  [libx264 @ 0x7fb4d184e400] mb B  I16..4:  0.8%  0.5%  0.4%  B16..8: 22.4%  3.5%  0.8%  direct: 1.1%  skip:70.4%  L0:41.1% L1:48.0% BI:10.9%
  
  [libx264 @ 0x7fb4d184e400] 8x8 transform intra:36.1% inter:66.1%
  
  [libx264 @ 0x7fb4d184e400] coded y,uvDC,uvAC intra: 33.5% 24.6% 1.8% inter: 8.5% 3.8% 0.0%
  
  [libx264 @ 0x7fb4d184e400] i16 v,h,dc,p:  4% 82%  1% 13%
  
  [libx264 @ 0x7fb4d184e400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 40% 18%  3%  4%  4%  7%  3%  5%
  
  [libx264 @ 0x7fb4d184e400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 40% 13%  3%  5%  5%  6%  3%  4%
  
  [libx264 @ 0x7fb4d184e400] i8c dc,h,v,p: 54% 36%  8%  2%
  
  [libx264 @ 0x7fb4d184e400] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fb4d184e400] ref P L0: 60.6% 10.5% 17.5% 11.4%
  
  [libx264 @ 0x7fb4d184e400] ref B L0: 77.6% 22.0%  0.4%
  
  [libx264 @ 0x7fb4d184e400] ref B L1: 99.1%  0.9%
  
  [libx264 @ 0x7fb4d184e400] kb/s:461.15

• Fun With Tablets And Amazon’s App Store

  24 décembre 2011, par Multimedia Mike — General, amazon, android, app store, cyanogenmod, ios, smurfs, tablet

  I bought an Android tablet a few months ago. It is less expensive than the best tablets but no where near the bottom end of the market. I think it’s pretty good. However, one downside is that it’s not “certified” to use Google’s official marketplace. That would seem to be somewhat limiting, however…

  Enter Amazon’s Android App Store
  Amazon got into the business of selling Android Apps some time ago. I started experimenting with this on a Nexus One phone that Google gave me. When I installed the App Store on the Android tablet and logged in, I was pleasantly surprised to see all of my Amazon apps ready for downloading onto the tablet.

  So I have an App Store for use with this Android tablet.

  Anyway, the reason I bring this up is because I managed to screw up this tablet in an unusual and humorous manner. You might be wondering if an app downloaded from the Amazon App Store requires the App Store to be present in order to run. The answer is : Oh yeah ! It works like this :

  
  
  

  This means that if — perhaps out of curiosity, for example — you login to the Amazon App Store, download an app, install it, and then subsequently log out of the App Store or uninstall it altogether, the downloaded app will decline to run until you log back into the store.

  Here’s the thing– I wanted to provide a minimal level of security for my Android tablet. At the very least, I wished to lock the Amazon App Store itself since Amazon is famously (and, let’s face it, understandably) reluctant to deliberately add any friction to their shopping processes. I.e., without any external protection app, the App Store app would allow anyone to purchase any app using my tablet.

  So I purchased App Protector Pro from the Amazon App Store and it worked quite well. By default, it also password protects against modifying any system settings as well as installing new apps.

  So, here’s where I screwed up : App Protector Pro was doing its faithful duty and I uninstalled the Amazon App Store as an experiment. Suddenly, no apps obtained from the App Store would work unless I reinstalled the App Store. Okay, fair enough, except for one thing– App Protector Pro wouldn’t run without the App Store. Well, it did, it started to, tried to, but then exited. So I couldn’t re-install the App Store :

  
  
  Oops
  

  I eventually learned how to perform a factory reset of the unit which solved the problem. And, as indicated earlier, all of my apps were available for me to re-download.

  Modding, Cyanogen-style
  Open source aficionados will likely point out that there are alternate firmware options which allow me to take control of my Android tablet in a free and open manner. Among these options is CyanogenMod. After I got stuck in the situation described above, I thought I would have to resort to such an option.

  On the plus side, researching alternative firmware options is what taught me to boot the device into a recovery mode and ultimately restore to a factory default setting. But if you’ll allow me to indulge in a mini-rant regarding accessibility of open source software : I was more than a little frustrated in trying to understand what CyanogenMod could possibly offer me. Their homepage says it’s “an aftermarket firmware”. I’m not entirely sure what that means or how it can benefit me. Fortunately, they have a full feature list linked from the front page. They are, in order : Lockscreen gestures, phone goggles, OpenVPN, incognito mode, themes support, and DSP equalizer. I can’t say that any of those really add any value for me. I’d love to know if CyanogenMod supports Google Android Market and various other Google apps (such as maps and GMail). That’s a question that I can’t seem to find the answer to.

  The themes feature opens another old wound for me. Back around 1999 when I was first getting into Linux in a serious way, I remember that themes were a big theme at the Linux User Groups I would attend. I also remember lots are online articles at the time that emphasized how highly customizable the Linux desktop was in comparison to Windows 9x. I was bothered for 2 reasons : First, I thought there were more pressing problems that needed to be addressed in Linux ; and second, none of these customization options seemed particularly straightforward ; many apparently required hours of compiling and tinkering.

  Small digression. Anyway, back to CyanogenMod, I was glad to see that they prominently display a button in order to “View Video Tour”. Ah, internet video has us so spoiled these days. I was eager to see this aftermarket firmware in action to see what it could do for me. However, the link leads to… a forum post ? The thread seems to discuss how it would be a cool idea if the community could put together a video tour. At this point, the investigation just seems bizarre. It feels like a bunch of kids doing their best to do things the grown-up way.

  Okay, sorry, rant over. I try to stay positive these days. I’m sure the CyanogenMod folks are doing great, fun, and interesting work on their project. The problems they choose to solve might lack mainstream appeal, however.

  Free iPad
  Ultimately, I recently unloaded the little Android tablet because, well… when a free iPad comes your way, lower spec tablets feel a little silly to keep around. Yeah, it’s great to play around with. Though here’s one unsettling thing I noticed about Apple’s App Store. While browsing for worthwhile games to indulge in, I noticed that they had a section for “Top Grossing Games”. This was a separate list from the “Top Apps” charts. I found the list weird for 2 reasons : 1) Why do I care which games are raking in the most cash ? How does this communicate value to me, personally ? Seriously, why would I base a purchasing decision around which vendor has earned the most money ?

  Anyway, let’s move on to reason #2 this was scary : Most of the games in this list had a price of FREE. One of them was that Capcom Smurfs game that stirred up controversy some months ago because of kids making unsupervised in-app purchases of virtual smurfberries. I tend to think that a top-grossing, free to play game is probably one that heavily encourages in-app purchases. Strange how this emerging trend actually encourages me to seek out games from the “top paid” list vs. “top free”.

• I Really Like My New EeePC

  29 août 2010, par Multimedia Mike — General

  Fair warning : I’m just going to use this post to blather disconnectedly about a new-ish toy.

  I really like my new EeePC. I was rather enamored with the original EeePC 701 from late 2007, a little box with a tiny 7″ screen that is credited with kicking off the netbook revolution. Since then, Asus has created about a hundred new EeePC models.

  Since I’m spending so much time on a train these days, I finally took the plunge to get a better netbook. I decided to stay loyal to Asus and their Eee lineage and got the highest end EeePC they presently offer (which was still under US$500)– the EeePC 1201PN. The ’12′ in the model number represents a 12″ screen size and the rest of the specs are commensurately as large. Indeed, it sort of blurs the line between netbook and full-blown laptop.

  
  
  

  Incidentally, after I placed the order for the 1201PN nearly 2 months ago, and I mean the very literal next moment, this Engadget headline came across announcing the EeePC 1215N. My new high-end (such as it is) computer purchase was immediately obsoleted ; I thought that only happened in parody. (As of this writing, the 1215N still doesn’t appear to be shipping, though.)

  It’s a sore point among Linux aficionados that Linux was used to help kickstart the netbook trend but that now it’s pretty much impossible to find Linux pre-installed on a netbook. So it is in this case. This 1201PN comes with Windows 7 Home Premium installed. This is a notable differentiator from most netbooks which only have Windows 7 Home Starter, a.k.a., the Windows 7 version so crippled that it doesn’t even allow the user to change the background image.

  I wished to preserve the Windows 7 installation (you never know when it will come in handy) and dual boot Linux. I thought I would have to use the Windows partition tool to divide work some magic. Fortunately, the default installation already carved the 250 GB HD in half ; I was able to reformat the second partition and install Linux. The details are a little blurry, but I’m pretty sure one of those external USB optical drives shown in my last post actually performed successfully for this task. Lucky break.

  
  
  The EeePC 1201PN, EeePC 701, Belco Alpha-400, and even a comparatively gargantuan Sony Vaio full laptop– all of the portable computers in the household
  

  So I got Ubuntu 10.04 Linux installed in short order. This feels like something of a homecoming for me. You see, I used Linux full-time at home from 1999-2006. In 2007, I switched to using Windows XP full-time, mostly because my home use-case switched to playing a lot of old, bad computer games. By the end of 2008, I had transitioned to using the Mac Mini that I had originally purchased earlier that year for running FATE cycles. That Mac served as my main home computer until I purchased the 1201PN 2 months ago.

  Mostly, I have this overriding desire for computers to just work, at least in their basic functions. And that’s why I’m so roundly impressed with the way Linux handles right out of the box. Nearly everything on the 1201PN works in Linux. The video, the audio, the wireless networking, the webcam, it all works out of the box. I had to do the extra installation step to get the binary nVidia drivers installed but even that’s relatively seamless, especially compared to “the way things used to be” (drop to a prompt, run some binary installer from the prompt as root, watch it fail in arcane ways because the thing is only certified to run on one version of one Linux distribution). The 1201PN, with its nVidia Ion2 graphics, is able to drive both its own 1366×768 screen simultaneously with an external monitor running at up on 2560×1600.

  The only weird hiccup in the whole process was that I had a little trouble with the special volume keys on the keyboard (specifically, the volume up/down/mute keys didn’t do anything). But I quickly learned that I had to install some package related to ACPI and they magically started to do the right thing. Now I get to encounter the Linux Flash Player bug where modifying volume via those special keys forces fullscreen mode to exit. Adobe really should fix that.

  Also, trackpad multitouch gestures don’t work right away. Based on my reading, it is possible to set those up in Linux. But it’s largely a preference thing– I don’t care much for multitouch. This creates a disparity when I use Windows 7 on the 1201PN which is configured per default to use multitouch.

  
  
  The same 4 laptops stacked up
  

  So, in short, I’m really happy with this little machine. Traditionally, I have had absolutely no affinity for laptops/notebooks/portable computers at all even if everyone around was always completely enamored with the devices. What changed for me ? Well for starters, as a long-time Linux user, I was used to having to invest in very specific, carefully-researched hardware lest I not be able to use it under the Linux OS. This was always a major problem in the laptop field which typically reign supreme in custom, proprietary hardware components. These days, not so much, and these netbooks seem to contain well-supported hardware. Then there’s the fact that laptops always cost so much more than similarly capable desktop systems and that I had no real reason for taking a computer with me when I left home. So my use case changed, as did the price point for relatively low-power laptops/netbooks.

  Data I/O geek note : The 1201PN is capable of wireless-N networking — as many netbooks seem to have — but only 100 Mbit ethernet. I wondered why it didn’t have gigabit ethernet. Then I remembered that 100 Mbit ethernet provides 11-11.5 Mbytes/sec of transfer speed which, in my empirical experience, is approximately the maximum write speed of a 5400 RPM hard drive– which is what the 1201PN possesses.