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• Implemented improvements and fixes suggested by Claudio Rumolo :

  28 février 2012, par Sebastian Tschan

  m server/php/upload.class.php Implemented improvements and fixes suggested by Claudio Rumolo : * If scaling factor is >= 1, don’t do any image processing. * Add JPEG/PNG quality parameter option. * Recalculate the file size if the original file has been replaced by a scaled (...)

• 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.

• Encode x264 video with ffmpeg for Android with starting offset

  4 août 2013, par scubed

  I'm trying to convert a video to play on an Android device.
  The video is from a big movie. I am chopping it back into pieces
  to correspond with the actual segments of the movie using -ss and -t.

  The input is mp4 with H.264 and AAC.
  The output is mkv using H.264 and Vorbis.

  Specifically, the input is :

  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/s

  I'm using : ffmpeg version 1.0.7

  The command I'm trying is something like :

  ffmpeg -ss 00:03:52.000 -i in.mp4 -t 00:01:00.000 -c:v libx264 -preset medium -crf 20 -maxrate 400k -bufsize 1835k -c:a libvorbis -sn out.mkv

  However, while the resulting video works fine on my computer, when I click on
  my phone, it says : Can't play video
  and checking the Android log, it has :

  E/SoftAVC (24319): Decoder failed: -2
  
  E/OMXCodec(24319): [OMX.google.h264.decoder] ERROR(0x80001001, -1007)

  It is still able to make a thumbnail for the movie, but not play it.

  Interestingly, some simple variations of that command do work :
  Remove -ss to start at the beginning of the video
  Use -an to disable audio

  These variations still failed :
  Copying the original audio with -c:a copy, or other audio codecs like vorbis, mp3
  Using mp4 instead of mkv
  Using baseline H.264 profile, including restricting level to 1.2.

  Running through mkvmerge first not only fails, but makes Android not able to even make a thumbnail.

  I don't know if it is related, but another small thing I noticed is that for
  starting transcoding later in the movie, the audio starts out slightly out-of-sync.
  After several seconds, it gets back in sync. The audio is in sync in the original.

  Robert Rowntree :

  -vcodec libx264 -b:v 200k -bt 50k -threads 0 -b_strategy 1 -acodec copy -f mp4 -strict -2

  Interesting. Your command almost works. The video actually plays on Android. The one problem is that the audio is out-of-sync and stays out-of-sync throughout the whole clip. But, that's much closer than I've been. I'll search around there and see if I can find the right combination.

  I tried combinations of it. It appears that using both mp4 and copying the audio is what allows it to work. Using libvorbis or going to mkv breaks it again. But, I would like to transcode the audio, and I suspect to keep it in sync, I might have to transcode it anyways. Note that even with transcoding, when I play it back on the computer, I still don't have sync between audio and video.

  LordNeckbeard :
  Here is the complete log.

  ffmpeg version 1.0.7 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 27 2013 13:01:19 with gcc 4.4.5 (Gentoo 4.4.5 p1.2, pie-0.4.5)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cxxflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --disable-debug --disable-doc --disable-vaapi --disable-runtime-cpudetect --enable-libmp3lame --enable-libvo-aacenc --enable-libtheora --enable-libx264 --enable-libxvid --enable-libcaca --enable-openal --disable-indev=v4l2 --disable-indev=oss --disable-indev=jack --enable-x11grab --disable-outdev=oss --enable-libfreetype --enable-pthreads --enable-libspeex --enable-libvorbis --disable-altivec --disable-avx --disable-vis --disable-neon --cpu=athlon64 -  libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2013-07-13 02:23:51
  
      encoder         : HandBrake 0.9.6 2012022800
  
    Duration: 03:14:01.41, start: 0.000000, bitrate: 2408 kb/s
  
      Chapter #0.0: start -0.133467, end 648.697411
  
      Metadata:
  
        title           : Chapter  1
  
      Chapter #0.1: start 648.697411, end 1297.345411
  
      Metadata:
  
        title           : Chapter  2
  
      Chapter #0.2: start 1297.345411, end 1729.777411
  
      Metadata:
  
        title           : Chapter  3
  
      Chapter #0.3: start 1729.777411, end 2378.425411
  
      Metadata:
  
        title           : Chapter  4
  
      Chapter #0.4: start 2378.425411, end 3027.073411
  
      Metadata:
  
        title           : Chapter  5
  
      Chapter #0.5: start 3027.073411, end 3675.721411
  
      Metadata:
  
        title           : Chapter  6
  
      Chapter #0.6: start 3675.721411, end 4108.153411
  
      Metadata:
  
        title           : Chapter  7
  
      Chapter #0.7: start 4108.153411, end 4756.801411
  
      Metadata:
  
        title           : Chapter  8
  
      Chapter #0.8: start 4756.801411, end 5405.449411
  
      Metadata:
  
        title           : Chapter  9
  
      Chapter #0.9: start 5405.449411, end 6054.097411
  
      Metadata:
  
        title           : Chapter 10
  
      Chapter #0.10: start 6054.097411, end 6702.745411
  
      Metadata:
  
        title           : Chapter 11
  
      Chapter #0.11: start 6702.745411, end 7135.177411
  
      Metadata:
  
        title           : Chapter 12
  
      Chapter #0.12: start 7135.177411, end 7783.825411
  
      Metadata:
  
        title           : Chapter 13
  
      Chapter #0.13: start 7783.825411, end 8432.473411
  
      Metadata:
  
        title           : Chapter 14
  
      Chapter #0.14: start 8432.473411, end 9081.121411
  
      Metadata:
  
        title           : Chapter 15
  
      Chapter #0.15: start 9081.121411, end 9513.553411
  
      Metadata:
  
        title           : Chapter 16
  
      Chapter #0.16: start 9513.553411, end 10162.201411
  
      Metadata:
  
        title           : Chapter 17
  
      Chapter #0.17: start 10162.201411, end 10810.849411
  
      Metadata:
  
        title           : Chapter 18
  
      Chapter #0.18: start 10810.849411, end 11459.497411
  
      Metadata:
  
        title           : Chapter 19
  
      Chapter #0.19: start 11459.497411, end 11641.412478
  
      Metadata:
  
        title           : Chapter 20
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/s
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
  [libx264 @ 0x14ea220] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
  
  [libx264 @ 0x14ea220] profile High, level 2.1
  
  [libx264 @ 0x14ea220] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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 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=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=400 vbv_bufsize=1835 crf_max=0.0 nal_hrd=none ip_ratio=1.40 aq=1:1.00
  
  Output #0, matroska, to 'out.mkv':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      encoder         : Lavf54.29.104
  
      Chapter #0.0: start 0.000000, end 60.000000
  
      Metadata:
  
        title           : Chapter  1
  
      Stream #0:0(und): Video: h264 (H264 / 0x34363248), yuv420p, 320x240, q=-1--1, 1k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:1(und): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, flt
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libvorbis)
  
  Press [q] to stop, [?] for help
  
  frame= 1799 fps= 92 q=-1.0 Lsize=    3738kB time=00:00:59.98 bitrate= 510.5kbits/s dup=0 drop=51    =51    
  
  video:3016kB audio:683kB subtitle:0 global headers:4kB muxing overhead 0.939943%
  
  [libx264 @ 0x14ea220] frame I:31    Avg QP:20.23  size: 14126
  
  [libx264 @ 0x14ea220] frame P:634   Avg QP:23.03  size:  3317
  
  [libx264 @ 0x14ea220] frame B:1134  Avg QP:27.71  size:   482
  
  [libx264 @ 0x14ea220] consecutive B-frames:  2.3% 12.8% 84.7%  0.2%
  
  [libx264 @ 0x14ea220] mb I  I16..4:  3.8% 63.8% 32.4%
  
  [libx264 @ 0x14ea220] mb P  I16..4:  0.1%  0.3%  0.1%  P16..4: 47.4% 30.2% 19.5%  0.0%  0.0%    skip: 2.4%
  
  [libx264 @ 0x14ea220] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 35.2%  3.0%  0.6%  direct: 8.8%  skip:52.3%  L0:28.7% L1:63.9% BI: 7.4%
  
  [libx264 @ 0x14ea220] 8x8 transform intra:64.0% inter:59.5%
  
  [libx264 @ 0x14ea220] coded y,uvDC,uvAC intra: 94.2% 99.5% 95.5% inter: 23.3% 55.5% 14.0%
  
  [libx264 @ 0x14ea220] i16 v,h,dc,p: 75% 10%  5% 10%
  
  [libx264 @ 0x14ea220] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 12%  8%  7%  8%  8% 11% 11%
  
  [libx264 @ 0x14ea220] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 20%  7%  8%  9%  9% 10% 10% 11%
  
  [libx264 @ 0x14ea220] i8c dc,h,v,p: 38% 31% 14% 17%
  
  [libx264 @ 0x14ea220] Weighted P-Frames: Y:7.3% UV:4.4%
  
  [libx264 @ 0x14ea220] ref P L0: 48.8% 14.2% 29.1%  7.5%  0.4%
  
  [libx264 @ 0x14ea220] ref B L0: 65.4% 30.8%  3.7%
  
  [libx264 @ 0x14ea220] ref B L1: 89.0% 11.0%
  
  [libx264 @ 0x14ea220] kb/s:411.70