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  • rajbot 3:26 pm on July 25, 2009 Permalink | Reply
    Tags: video   

    Alive in Joburg 

    From Wikipedia:

    Alive in Joburg is a science fiction short film directed by Neill Blomkamp, released in 2005 by Spy Films. It runs approximately six minutes long and was filmed in Johannesburg, South Africa. The film explores themes of apartheid, and is noted for its visual effects as well as its documentary-style imagery.


    link to IA page.

    Alive in Joburg is being remade by into a feature-length film called District 9 that looks like it borrows heavily from Transformers.

     
  • may 8:35 am on July 13, 2009 Permalink | Reply
    Tags: craziness, , downieville, riverjump, video   

    River Jumping 

    This weekend I went up to Downieville to race in the Downieville Classic which is the biggest mountain bike race in CA. It was so much fun! I’m happy to report that I still have all 4 limbs that I started with and they are in their proper place the last I checked. I shot the video above of the River Jump championships which happened after the cross country race on Saturday. I didn’t do that. These guys were nuts.

     
  • rajbot 7:35 pm on June 28, 2009 Permalink | Reply
    Tags: , pink saturday, pride, , , , video   

    TikiTV at Pink Saturday 

    Pink Saturday was amazing.. there were at least a trillion people there!

    Peliom took this picture of TikiTV VJ’ing on the main stage at Castro and Market:

    14547189

     
  • rajbot 1:03 pm on May 30, 2009 Permalink | Reply
    Tags: hulu, london, surreal, The Knack, video   

    The Knack… And How to Get It 

    The Knack is a surreal British comedy from 1965. I hadn’t seen it in a long time, and stumbled upon it on Hulu:

     
  • rajbot 1:23 pm on May 15, 2009 Permalink | Reply
    Tags: , , video   

    Auto-Tune the News #3: jumpin rope with you 

    Playin Donkey Kong with you:

     
  • rajbot 11:31 pm on May 12, 2009 Permalink | Reply
    Tags: , Bflat, Buddha Machine, , video   

    Bflat Buddha Machine 

    I went to bed at 2am last night. The alarm went off at 6am this morning . It was waaaay too early to do much other than check the internets, so that’s what I did, and found inbflat.net. This site is magic.

    Eventually I realized I had to stop playing with it and do some work, but I wanted to keep listening. So I made the Bb Buddha Machine.

    It probably doesn’t work in IE. It brings linux machines to their knees. But I listened to it for at least eight hours today. Enjoy!


    2011 update:

    Some awesome people have taken the Bb Buddha Machine and modified it to make new versions! Check them out:

    1. Bb Buddha Machine
    2. Dynamic Buddha Machine – a version by curiousjapan that dynamically loads YouTube videos tagged with “In Bb 2.0″ or any other phrase.
    3. noiZe vieW – a version by Peter Heß using his own recordings of his circuit-bent instruments.

    Also, I have put the code on github for easier collaboration.

     
    • Peter Heß 2:31 pm on December 17, 2011 Permalink | Reply

      Thanks for making the Buddha machine. Today I released a derivative work of your machine to make a noize Buddha machine. Code is released under the same licence. I made a lot of enhancements in configuration, volume control and changing the videos during the play. Again thanks for making the Buddha machine.

    • rajbot 9:21 pm on December 17, 2011 Permalink | Reply

      Thanks Peter! noiZe vieW is wonderful! I’m happy that you were inspired to make all these circuit-bent recordings!

  • rajbot 11:51 pm on May 8, 2009 Permalink | Reply
    Tags: comedy, , video   

    Awesomely weird comedy skit from Japan 

    via reddit.tv

     
  • tracey pooh 9:03 pm on May 8, 2009 Permalink | Reply
    Tags: , video   

    archive.org supports random seeking in their videos now! 

    i finally found the magic dead chicken to use
    with flowplayer + lighttpd + mod_h264_streaming.
    it turns out one needs to download and use an additional
    .swf file to get the scrubber bar to send the
    (already working) “?start=610″ (to start 610 seconds in)
    parameter to our litey on archive.org

    phew! yay!

     
  • rajbot 1:06 pm on May 5, 2009 Permalink | Reply
    Tags: houston, ship, , , video   

    Timelapse of ship navigating the Port of Houston at night 

    OneEighteen, a ship pilot in Houston, has posted this beautiful timelapse he took during a six-hour run through the Port of Houston:

    More info about the timelapse. CC by-nc licensed. Part 2 below:
    (More …)

     
  • rajbot 10:32 am on April 23, 2009 Permalink | Reply
    Tags: , , , video   

    Just ask Donkey Kong.. He’s in my crew 

    This is Auto-Tune the News #2. It gets awesome at 1m 23s:

    Also, Michael Gregory’s other videos.

     
    • rajbot 9:53 pm on April 28, 2009 Permalink | Reply

      Autotuned infomerical with brilliant editing:

    • rajbot 2:22 pm on May 2, 2009 Permalink | Reply

      AutoTune the News #3:

      1. 2 is by far the best, but this one does have singing cows.
  • rajbot 10:29 pm on April 12, 2009 Permalink | Reply
    Tags: , , , , , , , , video   

    TikiTV In Action 

    Here are some old pics of Sam and Peliom vj-ing with the open source TikiTV software at the Timothy Leary Archives event at 111 Minna. Way fun!

    IMG_5628

    IMG_5631

    IMG_5629

    IMG_5633

     
  • rajbot 11:40 pm on April 1, 2009 Permalink | Reply
    Tags: costume, transformer, video   

    moar than meets the eye 

    These are not your average Transformers fans:

     
  • rajbot 11:36 pm on April 1, 2009 Permalink | Reply
    Tags: , , hedgehog, Maru, video   

    kat vs hedge 

    I’ve already made most of you watch this video of Maru the Cat, walking around the house with a bag on his head. It is maybe the most awesome video on the internet:

    Well, here is the hedgehog version, via reddit:

    Also, here is a video of Maru playing with a box:

     
    • missy 1:37 am on April 2, 2009 Permalink | Reply

      Why are cats totally insane?

    • rajbot 10:05 pm on April 5, 2009 Permalink | Reply

      Here is a video of a cat using what bob calls “the noisy petting machine”:

      via reddit

    • rajbot 10:09 pm on April 5, 2009 Permalink | Reply

      What the hell? I can’t post embedded videos in comments anymore? Stupid blog.

      Take two:

    • missy 10:41 pm on April 5, 2009 Permalink | Reply

      First, I <3 tuxedo cats. They seem nice.

      Second, hilarious video!

      But yeah, cats = insane.

    • tracey pooh 11:57 am on April 7, 2009 Permalink | Reply

      btw, am i the only one who has noticed / been irked by the fact that wordpress “oh so helpfully” rearranges things like “clean” and working codes of video into totally broken …. codes when you edit your own post where you had a video embedded? man, i find that annoying. so annoying that i’ve started to use javascript API instead to embed videos on my wordpress blog.

      dunno if that would relate at all to any issues w/ embedding videos in comments (maybe if you edited a comment it broke then?)

    • tracey pooh 11:59 am on April 7, 2009 Permalink | Reply

      crap i should have said clean [embed] HTML tags and it breaks them into broken [object] tags

    • rajbot 12:07 pm on April 7, 2009 Permalink | Reply

      When I was working on ChatBubble I found WordPress was taking my valid xhtml and turning it into *invalid* xhtml. ugh.

      I found the WP-Unformatted plugin, to help with that. It’s kinda wonky to use, though.

      Stupid wordpress.

    • tracey pooh 2:39 pm on April 7, 2009 Permalink | Reply

      ok so i finally watched the vids.
      over lunch.
      which i highly recommend not doing.
      i think i just had an aneurysm watching maru in the bag.

      [tracey goes and looks for a brown paper bag to stop hyperventillating]

    • may 11:19 pm on April 7, 2009 Permalink | Reply

      why are cats on the internet so much more interesting than cats in real life? maybe i haven’t spent enough time with cats…

  • tracey pooh 10:14 pm on April 1, 2009 Permalink | Reply
    Tags: , , video   

    ffmpeg building on mac intel/x386 

    ffmpeg v0.5 just came out. it’s the bomb. it’s got tons of fixes and massive amounts of new codecs that it can read. for example, it can now decode my professional filmmaker brother’s “DVC ProHD” highly proprietary (and massive bitrate!) format! it can also decode flac and 24-bit flac. (encoding flac is disappointing though).

    at any rate! macports is a great way to get it installed on your mac.
    the current way of setting up macports and then doing
    sudo port install ffmpeg
    works fine on my PPC at work (oddly — pretty old computer now) but not my Air (intel x386)

    So I set out to find the fixes needed to make it work. Here they are:

    step 1: install macports — see http://www.macports.org/install.php

    sudo port install x264 +noasm # for i386 (not needed for PPC)
    sudo port fetch ffmpeg
    sudo port checksum ffmpeg
    sudo port extract ffmpeg
    sudo port patch ffmpeg
    remove “–enable-shared” from /opt/local/var/macports/sources/rsync.macports.org/release/ports/multimedia/ffmpeg/Portfile
    sudo port install ffmpeg

    (and “ffplay” is pretty cool now! i am considering using it over mplayer, hmm….)

     
  • rajbot 3:42 pm on March 21, 2009 Permalink | Reply
    Tags: , video   

    Barcelona Tram Ride in 1908 

    I’m sure all of you have seen the amazing Trip Down Market Street, shot on a cable car in 1905. And you’ve probably seen the same route shot in 1906 after the earthquake (skip to middle).

    But have you seen this footage shot from a Barcelona street car in 1908?

    via reddit

     
  • peliom 11:54 am on February 9, 2009 Permalink | Reply
    Tags: , , video   

    TikiTV Launched Party! 

    We had a fantastic live action demo of TikiTV last night at the reception party celebrating the launch of the Timothy Leary Video Collection. A lot of great people were asking about TikiTV, how it works, how to use it, how to get involved. This is the start of a good thing.

    Add your TIKITV comments/questions below and we will hook you up!

     
    • Larry Maloney 1:26 am on September 20, 2009 Permalink | Reply

      I saw TikiTv tonight at the HackerDojo grand opening, and my I was stunned. This thing is super cool!

      Mixing multiple video streams! It’s a MUST have for your next party. Super fun, and never the same. I just downloaded TikiTV and I can’t wait to mix in some of my family videos with emotional backgrounds.

    • jeicrash 2:20 pm on March 28, 2010 Permalink | Reply

      Any plans for windows or linux version? Also midi input support would be nice, like to use my korg nanokontrol to fade layers.

  • tracey pooh 12:13 am on February 3, 2009 Permalink | Reply
    Tags: , video   

    Tracey and Hunter go to Obama’s Inauguration 

    Hunter and I travelled from CA to D.C. to watch Obama’s Inauguration.
    We stood in the very cold historic day for 5 hours (after 3 hours getting from VA to DC) but were THRILLED!
    We watched from The Mall, at 12 Street, about 2/3 of the distance from The Capitol to the Washington Monument.

    I made a 7 minute short video of our 70 hour trip 8-)

     
    • siznax 12:57 pm on February 3, 2009 Permalink | Reply

      glad you had fun. thanks for sharing!

    • rajbot 12:10 am on February 4, 2009 Permalink | Reply

      :)

  • rajbot 1:38 pm on January 27, 2009 Permalink | Reply
    Tags: , , opengl, , , video,   

    Announcing TikiTV, the Best Open Source VJ Software Ever! 

    TikiTV is an awesome open-source video mixing application for Mac OSX, developed by peliom and VJ Science. If you are a video nerd, you should check this out:


    • decodes 6 full-quality 720×480 MPEG-2 streams at 60fps
    • on screen preview of both 3-channel decks
    • fullscreen output to second display (vga projector)
    • rock solid 60fps output, no dropping frames
    • requires MacBook Pro 2GHz or higher

    You can download TikiTV here. For the video hax0rz out there, you can clone the the github repo.

    tikitv

     
  • rajbot 3:31 pm on January 22, 2009 Permalink | Reply
    Tags: , video   

    This is Rock and Roll. 

    Wait for it…

     
    • trish 5:31 pm on January 25, 2009 Permalink | Reply

      i admit that i seriously underestimated this guy at first…won’t make that mistake again. ;)

  • rajbot 11:00 pm on January 16, 2009 Permalink | Reply
    Tags: , , , video   

    Aer OBAMA 

    Daft Punk vs. Adam Freeland – “Aer OBAMA”

    The following is a mixed-media stop motion music video and celebration commemorating the election and inauguration of Barack Obama as the forty-fourth president of these United States. Audibly showcasing Adam Freeland’s remix of Daft Punk’s “Aerodynamic” and the imaginative stylings of forward thinking toy artists Dalek, Bill McMullen and Kubrick to name just a few. Independently animated and directed by the progressive minds of the directing team GOLD, the piece is a labor of love that invites everyone to join in or create their own celebration this coming Tuesday January the 20th.

    dunno how I missed this until now! via Laughing Squid.

     
  • rajbot 3:03 pm on January 11, 2009 Permalink | Reply
    Tags: cambodia, , , , video   

    Tracking a Kiva Loan 

    This is a great video that a Kiva volunteer made to document the path that a $25 microfinance loan made in London took to reach a rice farmer in Cambodia. The $25 loan is paid back in 12 monthly installments of $2.08, and one of the repayments is captured in the video. It’s awesome to see the connection between the people in London who made the loan, the Kiva employees in SF who brokers the loan, the microfinance institution in Cambodia who processes the loan, and the farmer who receives it. Yay Kiva! Our next Amazon check should go towards a microloan!


    A Fistful Of Dollars: The Story of a Kiva.org Loan from Kieran Ball on Vimeo.

     
  • rajbot 2:50 pm on December 13, 2008 Permalink | Reply
    Tags: ClayShirky, , shinto, video   

    Perl is a Shinto Shrine 

    I love this little talk Clay Shirky gave at Supernova 2007:

    “The Imbe Priests would totally get Linux!” via reddit.

     
  • may 4:10 pm on December 11, 2008 Permalink | Reply
    Tags: bacon, , , video   

    Bacon, Beer, & Bikes 

    I did my last big race of the cyclocross season on sunday and it was super fun! I’d never done any kind of racing before this year so I’m happy that I survived it. Here’s a video I shot of the day out at coyote point. (my team is the one decked out in crazy floral skinsuits. We won the prize for wearing the “most offensive cycling attire this guy has ever laid eyes on.” woot!)

    The most important prize though was the bacon!

     
  • tracey pooh 12:44 pm on November 16, 2008 Permalink | Reply
    Tags: , , rectangular pixels, video, widescreen   

    ffmpeg hook to aid with “rectangular pixels” 

    Tired of screen-scraping the output of ffmpeg and/or mplayer to get the parameters / clip info for a media file?

    This hook attempts to remedy this by printing simple information about the passed in video from the cmd line.

    It will also print out whether or not the clip is using “rectangular pixels”.

    WTF is a rectangular pixel?

     

    Well, the easiest examples are DVDs.  You only want to buy a DVD if it says one of two standard phrases on it — “Enhanced for 16:9 TVs” or “Anamorphic widescreen“.  They both mean the same thing — namely that the video on the DVD disk is wider than 4:3 aspect (pretty much all films are ratio 16:9 or even wider like ratio 2.35:1) *and* that it didn’t *waste* any DVD bytes by encoding “top/bottom black bars”.  (If it doesn’t say those code phrases, it’s an older, crappy/low budget produced, or worse a “pan-n-scan” chopped film (where they lop off the left and right sides of each frame to fit into a 4:3 TV!)  Worst yet, if the DVD only says something like “widescreen version”, though it sounds good, it means while they didn’t cut off the picture, they wasted 25% (or more!) of the pixels encoding “black bars” on the top and bottom.  So you have less pixels in the DVD encoding the picture compared to an “anamorphic” version of the same thing.  Hello crappy quality!)

     

     

    Anamorphic DVDs are encoded internally at 720×480 pixels per image.

    Now look at this:

      4:3 video == 1.33 ratio == 640×480 pixels image

    16:9 video  == 1.78 ratio == 854×480 pixels image

    so what is 720×480?  it’s almost perfectly in the middle of those two — math: 720/480 = 1.5

    So the “encoded transport image size” is neither 16:9, nor 4:3 — it’s right in the middle, capable to encode either a 4:3 video (like non-high def TV, many computer screens) or 16:9 video (high def TV, some digital video).  I like to think of it as “how the formats that came out right before HDTV took off, compromised to hedge there bets to be between 4:3 and 16:9″.

    The final critical bit of information about a DVD is the “aspect ratio” (not of the overall image, confusingly, but of each encoded *pixel*!)  This says “wait, this pixel isn’t square, literally, like you’d think if you just read the image — it’s actually supposed to be stretched to make the *overall image* either 640 pixels wide (squoosh down from 720) or 854 (stretch wider to 854).  So the video track is “flagged” with a “pixel aspect” (often referred to as PAR (Pixel Aspect Ratio), SAR (Sample Aspect Ratio), or DAR (Display Aspect Ratio) — some of those have some slight nuances/differences, but that’s digging too deep).  Anyway, neat, huh?  Your anamorphic DVD is a changeling!  (maybe “anamorphic” makes more sense mnemonically now 8-)  (PS: “DV” video — the most common format that digital camcorders that write to tape use — is similar.  720×480 pixels/image plus a “flag” for what each pixel “shape” is).

     

    This hook I wrote will output information about the clip (like “ffmpeg -i” will do, but in a format easier to parse) as well as information about the pixels (unlike ffmpeg).  So you can then know more about a clip if you are going to do things like pull single frames/thumbnails from it or convert it to another format.  We have been using this at Internet Archive for our movies for over a year and a half now and it works great!

     

    C Code is here.  

    There are some instructions for compiling with an ffmpeg source at the top of the C code.  (There is also an ubuntu-on-AMD compiled “.so” at that link by changing the suffix from “.c” to “.so”, FWIW)

     

    Example invocation and output:

    ffmpeg -vhook "/petabox/deriver/identify.so oldpresidio.mpeg"
    FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
      configuration: --enable-gpl --enable-pp --enable-libvorbis --enable-libogg --enable-liba52 --enable-libdts --enable-dc1394 --enable-libgsm --disable-debug --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-x264 --prefix=/usr/
      libavutil version: 49.3.0
      libavcodec version: 51.38.0
      libavformat version: 51.10.0
      built on Nov 30 2007 19:09:20, gcc: 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)
    Video: mpeg2video, yuv420p, 720x480, q=2-31, 8000 kb/s
    width: 720
    height: 480
    aspect: 32/27
    fps: 29.97
    duration: 00:03:05.2
    audio: true
    Failed to Configure /petabox/deriver/identify.so
    Failed to add video hook function: /petabox/deriver/identify.so oldpresidio.mpeg
    The “failure” above at the end is deliberate/OK (it just makes sure ffmpeg stops and doesn’t try to transcode).
    So we see that this video clip:
    http://www.archive.org/download/',loop:false,controlBarBackgroundColor:'0x000000',splashImageFile:'oldpresidio/oldpresidio.thumbs/oldpresidio_00000001.jpg'}" />http://www.archive.org/download/',loop:false,controlBarBackgroundColor:'0x000000',splashImageFile:'oldpresidio/oldpresidio.thumbs/oldpresidio_00000001.jpg'}">
    is indeed widescreen by the “aspect” line above (indicating the pixels are rectangular, not square) with value 32/27.
    If we multiply the encoded image width of “720″ by 32 and divide by 27, we get the magic/correct 853.33 (round up or down to nearest pixel).
    We use this utility at Internet Archive to make user friendly formats like “h.264 .mp4″ videos and “Ogg Theora .ogv” videos that get converted to the proper square pixel equivalent (and *not* messup widescreen videos 8-)
     
    • Kai 6:45 am on April 3, 2009 Permalink | Reply

      Looks like this is what we have been looking for. I am not entirely sure though how to install it. Just downloaded the ffmpeg trunk (0.5) and it looks like there is no more vhook directory. Can you provide step by step instructions? MUCH appreciated, thanks.
      Kai

    • tracey pooh 11:47 am on April 7, 2009 Permalink | Reply

      hi kai! have you been able to build it? if you are using a mac, here’s another post you may find interesting that shows how i built it on both a PPC (work) and intel (home) mac with OS-X…

      http://www.dumbbunny.org/2009/04/01/ffmpeg-building-on-mac-intelx386/

      at any rate, the great thing about ffmpeg v0.5 is that, so far, in all the testing i have done, it seems to *finally* report the PAR (Pixel Aspect Ratio) for an item that has “rectangular pixels” right on the command line. so we at archive.org should soon no longer need to use this “vhook” and the C code that i wrote, yay!

      so, for example, here is the new output from v0.5 ffmpeg on the same video file above now:

      ffmpeg -i oldpresidio.mpeg
      ….
      Duration: 00:03:05.71, start: 0.290656, bitrate: 8070 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720×480 [PAR 32:27 DAR 16:9], 8000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s

      you can parse the PAR output from the output, when it exists, to know that the pixels in the video are rectangular.

      so, from some PHP code that we use at archive.org:
      $filmWidth = round($filmWidth * $parW / $parH);
      we would plug in our numbers from the ffmpeg info/output to be
      $filmWidth = round(720 * 32 / 27)
      which comes out to round(853.33333…)
      or 852 (typically want to round to an even number)

  • tracey pooh 6:38 pm on November 6, 2008 Permalink | Reply
    Tags: archive.org, , ogg, theora, video   

    geek stuff from archive.org — making Ogg Theora videos 

    Fast, reliable way to encode Theora Ogg videos using ffmpeg, libtheora, and liboggz

    archive.org has started to make theora derivatives for movie files, where we create an Ogg Theora video format output for each movie file.   after trying a bunch of tools over a good corpus of wide-ranging videos, i found a neat way to make the Archive derivatives.

     High Level:

    • use ffmpeg to turn any video to “rawvideo”. 
    • pipe its output to *another* ffmpeg to turn the video to “yuv4mpegpipe”.
    • pipe its output to the libtheora tool. 
    • for videos with audio, ffmpeg create a vorbis audio .ogg file. 
    • add tasty metadata (with liboggz utils). 
    • combine the video and audio ogg files to an .ogv output!   

    Detailed example:  

     
    /usr/bin/ffmpeg -v 0 -an -deinterlace  -s 400x300 -r 20.00 -i CapeCodMarsh.avi -vcodec rawvideo -pix_fmt yuv420p -f rawvideo -  | \
    /usr/bin/ffmpeg -v 0 -an -f rawvideo   -s 400x300 -r 20.00 -i - -f yuv4mpegpipe -  | \
    /petabox/deriver/libtheora-1.0/lt-encoder_example --video-rate-target 512k - -o tmp.ogv;
     
    /usr/bin/ffmpeg -y -i CapeCodMarsh.avi -vn -acodec vorbis -ac 2 -ab 128k -ar 44100 audio.ogg;
    /petabox/sw/bin/oggz-comment audio.ogg -o audio2.ogg TITLE="Cape Cod Marsh" ARTIST="Tracey Jaquith" LICENSE="http://creativecommons.org/licenses/publicdomain/" DATE="2004" ORGANIZATION="Dumb Bunny Productions"  LOCATION=http://www.archive.org/details/CapeCodMarsh;
    /petabox/sw/bin/oggzmerge tmp.ogv audio2.ogg -o CapeCodMarsh.ogv;

    WTFs:

    • Why the double pipe above? Some videos could not go directly to yuv4mpegpipe format such that libtheora (or ffmpeg2theora) would work all the time.
    • We do the vorbis audio outside of libtheora (or ffmpeg2theora) to avoid any issues with Audio/Video sync.
    • We convert to yuv420p in the rawvideo step because ffmpeg2theora has (i think) some known issues of not handling all yuv422 video inputs (i found at least a few videos that did this).
    • We add the metadata to the audio vorbis ogg because adding it to the video ogv file wound up making the first video frame not a keyframe (!)

    So this will end up working in Firefox 3.1 and greater — the new HTML “video” tag:

    <video controls=”true” autoplay=”true” src=”http://www.archive.org/download/commute/commute.ogv”&gt; for firefox betans </video>

    This technique above worked nicely across a wide range of source and “trashy” 46 videos that I use for QA before making live a new way to derive our videos at archive.org ( http://www.archive.org/~MY-FIRST-NAME/_/stream.php  [sorry don't necessarily want all that crawled by non rajbot robots] )

    -tracey jaquith   “don’t make me 3:2 pulldown you”

     
    • Adam Rosi-Kessel 5:44 am on November 7, 2008 Permalink | Reply

      I’ve always used ffmpeg2theora without any A/V sync problems — that would seem to be the much simpler option where it works. Are there certain conditions you’ve found where ffmpeg2theora fails?

    • tracey jaquith 11:43 am on November 7, 2008 Permalink | Reply

      absolutely i can find A/V sync issues quite easily, unfortunately.

      now, granted, there are likely some issues with the encoding of these videos as inputs to being with — but these aren’t uncommon w/ the stuff that we get uploaded to archive.org.

      http://www.archive.org/~MY-FIRST-NAME/_/amoalaura/amoaLauraMTV.wmv

      both of these fail to sync A/V:
      ffmpeg2theora amoaLauraMTV.wmv -sync -o out.ogv
      ffmpeg2theora amoaLauraMTV.wmv -o out.ogv

      using my technique above, we sync properly.
      it could be just that ffmpeg is more forgiving when dealing with “trashier” encodings…

    • shag 1:47 pm on December 18, 2008 Permalink | Reply

      yow, 3:2 pulldown, sounds humiliating ;-)

    • Gregory Maxwell 2:15 pm on February 7, 2009 Permalink | Reply

      Please do not use the above instructions unless you want to be accused of intentionally making Vorbis look bad. The FFMPEG internal Vorbis encoder is not something anyone should actually use. The sound quality is terrible.

      I suspect most people (myself included) were unaware of FFMPEG’s internal Vorbis encoder because just about everything else uses the (BSD licensed) Xiph.Org reference encoder.

      The above commands should be changed to use “-acodec libvorbis” rather than “-acodec vorbis”:

      ffmpeg -y -i CapeCodMarsh.avi -vn -acodec libvorbis -ac 2 -ab 128k -ar 44100 audio.ogg

      This is not audio-geek nitpicking: The above “128kbit” FFMPEG produced audio sounds worse than 32kbit/sec output produced from a reasonable encoder.

      In order to make this point more clearly I have posted a couple of 11 second examples. First listen to a 64kbit/sec example produced by Xiph.org libVorbis. Then listen to the “128kbit/sec” FFMPEG output (which is really about 64kbit/sec for this input). As you can see, the FFMPEG output sounds very bad in both absolute and comparative terms. Even 32kbit/sec audio produced by a decent encoder sounds much better than the ffmpeg output.

    • tracey jaquith 4:43 pm on February 19, 2009 Permalink | Reply

      thanks for the info.

      couple quick things. the sound is not very good agreed — but i would personally not say “terrible”.

      we are looking into altering our technique to use libvorbis, but i thought i should point out that not everyone is using the most recent version of linux as i suspect you may be? archive.org is still stuck on “gutsy” version of ubuntu which is from oct 2007. so even with “–enable-libvorbis” compiled into gutsy-era ubuntu, there is no known codec alternative other than “-acodec vorbis” that can do vorbis.

      we are more likely to do an OS upgrade and try to update it at that point.

      so i don’t disagree with you, i just think the severity of the warning is a tad higher than need be. likely we’ll disagree about that but that’s ok.

      thx for the pointer!

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