Mercurial > cortex

     1 #+title: Capture Live Video Feeds from JMonkeyEngine

     2 #+author: Robert McIntyre

     3 #+email: rlm@mit.edu

     4 #+description: Capture video from a JMonkeyEngine3 Application with Xuggle, and use gstreamer to compress the video to upload to YouTube.

     5 #+keywords: JME3, video, Xuggle, JMonkeyEngine, youtube, capture video, Java

     6 #+SETUPFILE: ../../aurellem/org/setup.org

     7 #+INCLUDE: ../../aurellem/org/level-0.org

     8 

     9 

    10 * The Problem

    11 So you've made your cool new JMonkeyEngine3 game and you want to

    12 create a demo video to show off your hard work. Screen capturing is

    13 the most straightforward way to do this, but it can slow down your

    14 game and produce low-quality video as a result. A better way is to

    15 record a video feed directly from the game while it is running.

    16 

    17 In this post, I'll explain how you can alter your JMonkeyEngine3 game

    18 to output video while it is running. The main trick is to alter the

    19 pace of JMonkeyEngine3's in-game time: we allow the engine as much

    20 time as it needs to compute complicated in-game events and to encode

    21 video frames. As a result, the game appears to speed up and slow down

    22 as the computational demands shift, but the end result is perfectly

    23 smooth video output at a constant framerate.

    24 

    25 

    26 * Video recording requires a steady framerate

    27 ** The built-in =Timer= rushes to keep up.

    28 #* Game-time vs. User-time vs. Video-time

    29 

    30 Standard JME3 applications use a =Timer= object to manage time in the

    31 simulated world. Because most JME3 applications (e.g. games) are

    32 supposed to happen \ldquo{}live\rdquo{}, the built-in =Timer= requires

    33 simulated time to match real time. This means that the application

    34 must rush to finish all of its calculations on schedule: the more

    35 complicated the calculations, the more the application is obligated to

    36 rush. And if the workload becomes too much to handle on schedule,

    37 =Timer= forces the application to cut corners: it demands fast,

    38 approximate answers instead of careful, accurate ones.  Although this

    39 policy sometimes causes physically impossible glitches and choppy

    40 framerates, it ensures that the user will never be kept waiting while

    41 the computer stops to make a complicated calculation.

    42 

    43 Now, the built-in =Timer= values speed over accuracy because real-time

    44 applications require it. On the other hand, if your goal is to record

    45 a glitch-free video, you need a =Timer= that will take its time to

    46 ensure that all calculations are accurate, even if they take a long

    47 time. In the next section, we will create a new kind of

    48 =Timer=\mdash{}called =IsoTimer=\mdash{}which slows down to let the

    49 computer finish all its calculations. The result is a perfectly steady

    50 framerate and a flawless physical simulation.

    51 

    52 # are supposed to happen \ldquo live \rdquo, this =Timer= requires the

    53 # application to update in real-time. In order to keep up with the

    54 # real world, JME applications cannot afford to take too much time on

    55 # expensive computations. Whenever the workload becomes too much for

    56 # the computer to handle on schedule, =Timer= forces the computer to

    57 # cut corners, giving fast, approximate answers instead of careful,

    58 # accurate ones. Although physical accuracy sometimes suffers as a

    59 # result, this policy ensures that the user will never be kept waiting

    60 # while the computer stops to make a complicated calculation.

    61 

    62 #fast answers are more important than accurate ones. 

    63 

    64 # A standard JME3 application that extends =SimpleApplication= or

    65 # =Application= tries as hard as it can to keep in sync with

    66 # /user-time/.  If a ball is rolling at 1 game-mile per game-hour in

    67 # the game, and you wait for one user-hour as measured by the clock on

    68 # your wall, then the ball should have traveled exactly one

    69 # game-mile. In order to keep sync with the real world, the game

    70 # throttles its physics engine and graphics display.  If the

    71 # computations involved in running the game are too intense, then the

    72 # game will first skip frames, then sacrifice physics accuracy.  If

    73 # there are particuraly demanding computations, then you may only get

    74 # 1 fps, and the ball may tunnel through the floor or obstacles due to

    75 # inaccurate physics simulation, but after the end of one user-hour,

    76 # that ball will have traveled one game-mile.

    77 

    78 # When we're recording video, we don't care if the game-time syncs

    79 # with user-time, but instead whether the time in the recorded video

    80 # (video-time) syncs with user-time. To continue the analogy, if we

    81 # recorded the ball rolling at 1 game-mile per game-hour and watched

    82 # the video later, we would want to see 30 fps video of the ball

    83 # rolling at 1 video-mile per /user-hour/. It doesn't matter how much

    84 # user-time it took to simulate that hour of game-time to make the

    85 # high-quality recording.

    86 ** COMMENT Two examples to clarify the point:

    87 *** Recording from a Simple Simulation

    88 

    89 **** Without a Special Timer

    90 You have a simulation of a ball rolling on an infinite empty plane at

    91 one game-mile per game-hour, and a really good computer. Normally,

    92 JME3 will throttle the physics engine and graphics display to sync the

    93 game-time with user-time. If it takes one-thousandth of a second

    94 user-time to simulate one-sixtieth of a second game time and another

    95 one-thousandth of a second to draw to the screen, then JME3 will just

    96 sit around for the remainder of $\frac{1}{60} - \frac{2}{1000}$

    97 user-seconds, then calculate the next frame in $\frac{2}{1000}$

    98 user-seconds, then wait, and so on. For every second of user time that

    99 passes, one second of game-time passes, and the game will run at 60

   100 frames per user-second.

   101 

   102 

   103 **** With a Special Timer

   104 Then, you change the game's timer so that user-time will be synced to

   105 video-time. Assume that encoding a single frame takes 0 seconds

   106 user-time to complete.

   107 

   108 Now, JME3 takes advantage of all available resources. It still takes

   109 one-thousandth of a second to calculate a physics tick, and another

   110 one-thousandth to render to the screen. Then it takes 0 seconds to

   111 write the video frame to disk and encode the video. In only one second

   112 of user time, JME3 will complete 500 physics-tick/render/encode-video

   113 cycles, and $\frac{500}{60}=8\frac{1}{3}$ seconds of game-time will

   114 have passed.  Game-time appears to dilate $8\frac{1}{3}\times$ with

   115 respect to user-time, and in only 7.2 minutes user-time, one hour of

   116 video will have been recorded. The game itself will run at 500 fps.

   117 When someone watches the video, they will see 60 frames per

   118 user-second, and $\frac{1}{60}$ video-seconds will pass each frame. It

   119 will take exactly one hour user-time (and one hour video-time) for the

   120 ball in the video to travel one video-mile.

   121 

   122 *** Recording from a Complex Simulation 

   123 

   124 *** Without a Special Timer

   125 You have a simulation of a ball rolling on an infinite empty plane at

   126 one game-mile per game-hour accompanied by multiple explosions

   127 involving thousands of nodes, particle effects, and complicated shadow

   128 shaders to create realistic shadows. You also have a slow

   129 laptop. Normally, JME3 must sacrifice rendering and physics simulation

   130 to try to keep up.  If it takes $\frac{1}{120}$ of a user-second to

   131 calculate $\frac{1}{60}$ game-seconds, and an additional

   132 $\frac{1}{60}$ of a user-second to render to screen, then JME3 has

   133 it's work cut out for it.  In order to render to the screen, it will

   134 first step the game forward by up to four physics ticks before

   135 rendering to the screen. If it still isn't fast enough then it will

   136 decrease the accuracy of the physics engine until game-time and user

   137 time are synched or a certain threshold is reached, at which point the

   138 game visibly slows down. In this case, JME3 continuously repeat a

   139 cycle of two physics ticks, and one screen render. For every

   140 user-second that passes, one game-second will pass, but the game will

   141 run at 30 fps instead of 60 fps like before.

   142 

   143 *** With a Special Timer

   144 Then, you change the game's timer so that user-time will be synced to

   145 video-time. Once again, assume video encoding takes $\frac{1}{60}$ of

   146 a user-second.

   147 

   148 Now, JME3 will spend $\frac{1}{120}$ of a user-second to step the

   149 physics tick $\frac{1}{60}$ game-seconds, $\frac{1}{60}$ to draw to

   150 the screen, and an additional $\frac{1}{60}$ to encode the video and

   151 write the frame to disk. This is a total of $\frac{1}{24}$

   152 user-seconds for each $\frac{1}{60}$ game-seconds. It will take

   153 $(\frac{60}{24} = 2.5)$ user-hours to record one game-hour and

   154 game-time will appear to flow two-fifths as fast as user time while

   155 the game is running. However, just as in example one, when all is said

   156 and done we will have an hour long video at 60 fps.

   157 

   158 

   159 ** COMMENT proposed names for the new timer

   160 # METRONOME

   161 # IsoTimer

   162 # EvenTimer

   163 # PulseTimer

   164 # FixedTimer

   165 # RigidTimer

   166 # FixedTempo

   167 # RegularTimer

   168 # MetronomeTimer

   169 # ConstantTimer

   170 # SteadyTimer

   171 

   172 

   173 ** =IsoTimer= records time like a metronome

   174 

   175 The easiest way to achieve this special timing is to create a new

   176 timer that always reports the same framerate to JME3 every time it is

   177 called.

   178 

   179 

   180 =./src/com/aurellem/capture/IsoTimer.java=

   181 #+include ../../jmeCapture/src/com/aurellem/capture/IsoTimer.java src java

   182 

   183 If an Application uses this =IsoTimer= instead of the normal one, we

   184 can be sure that every call to =simpleUpdate=, for example,

   185 corresponds to exactly $(\frac{1}{fps})$ seconds of game-time.

   186 

   187 * =VideoRecorder= manages video feeds in JMonkeyEngine.

   188 

   189 

   190 ** =AbstractVideoRecorder= provides a general framework for managing videos.

   191 

   192 Now that the issue of time is solved, we just need a function that

   193 writes each frame to a video.  We can put this function somewhere

   194 where it will be called exactly once per frame.

   195 

   196 The basic functions that a =VideoRecorder= should support are

   197 recording, starting, stopping, and possibly a cleanup step

   198 where it finalizes the recording (e.g. by writing headers for a video

   199 file).

   200 

   201 An appropiate interface describing this behaviour could look like

   202 this:

   203 

   204 =./src/com/aurellem/capture/video/VideoRecorder.java=

   205 #+include ../../jmeCapture/src/com/aurellem/capture/video/VideoRecorder.java src java

   206 

   207 

   208 JME3 already provides exactly the class we need: the =SceneProcessor=

   209 class can be attached to any viewport and the methods defined therein

   210 will be called at the appropriate points in the rendering process.

   211 

   212 However, it is also important to properly close the video stream and

   213 write headers and such, and even though =SceneProcessor= has a

   214 =.cleanup()= method, it is only called when the =SceneProcessor= is

   215 removed from the =RenderManager=, not when the game is shutting down

   216 when the user pressed ESC, for example. To obtain reliable shutdown

   217 behaviour, we also have to implement =AppState=, which provides a

   218 =.cleanup()= method that /is/ called on shutdown.

   219 

   220 Here is an AbstractVideoRecorder class that takes care of the details

   221 of setup and teardown.

   222 

   223 =./src/com/aurellem/capture/video/AbstractVideoRecorder.java=

   224 #+include ../../jmeCapture/src/com/aurellem/capture/video/AbstractVideoRecorder.java src java

   225 

   226 

   227 ** There are many options for handling video files in Java

   228 

   229 If you want to generate video from Java, a great option is [[http://www.xuggle.com/][Xuggle]]. It

   230 takes care of everything related to video encoding and decoding and

   231 runs on Windows, Linux and Mac.  Out of all the video frameworks for

   232 Java, I personally like this one the best.

   233 

   234 Here is a =VideoRecorder= that uses [[http://www.xuggle.com/][Xuggle]] to write each frame to a

   235 video file.

   236 

   237 =./src/com/aurellem/capture/video/XuggleVideoRecorder.java=

   238 #+include ../../jmeCapture/src/com/aurellem/capture/video/XuggleVideoRecorder.java src java

   239 

   240 With this, we are able to record video!

   241 

   242 However, it can be hard to properly install Xuggle. If you would

   243 rather not use Xuggle, here is an alternate class that uses [[http://www.randelshofer.ch/blog/2008/08/writing-avi-videos-in-pure-java/][Werner

   244 Randelshofer's]] excellent pure Java AVI file writer.

   245 

   246 =./src/com/aurellem/capture/video/AVIVideoRecorder.java=

   247 #+include ../../jmeCapture/src/com/aurellem/capture/video/AVIVideoRecorder.java src java

   248 

   249 This =AVIVideoRecorder= is more limited than the

   250 =XuggleVideoRecorder=, but requires less external dependencies.

   251 

   252 Finally, for those of you who prefer to create the final video from a

   253 sequence of images, there is the =FileVideoRecorder=, which records

   254 each frame to a folder as a sequentially numbered image file. Note

   255 that you have to remember the FPS at which you recorded the video, as

   256 this information is lost when saving each frame to a file.

   257 

   258 =./src/com/aurellem/capture/video/FileVideoRecorder.java=

   259 #+include ../../jmeCapture/src/com/aurellem/capture/video/FileVideoRecorder.java src java

   260 

   261 

   262 

   263 

   264 * How to record videos yourself

   265 

   266 ** Include this code.

   267 

   268 No matter how complicated your application is, it's easy to add

   269 support for video output with just a few lines of code.

   270 #  You can also record from multiple ViewPorts as the above example shows.

   271 

   272 And although you can use =VideoRecorder= to record advanced

   273 split-screen videos with multiple views, in the simplest case, you

   274 want to capture a single view\mdash{} exactly what's on screen. In

   275 this case, the following simple =captureVideo= method will do the job:

   276 

   277 #+begin_src java

   278 public static void captureVideo(final Application app, 

   279 				final File file) throws IOException{

   280     final AbstractVideoRecorder videoRecorder;

   281     if (file.getCanonicalPath().endsWith(".avi")){

   282 	videoRecorder = new AVIVideoRecorder(file);}

   283     else if (file.isDirectory()){

   284 	videoRecorder = new FileVideoRecorder(file);}

   285     else { videoRecorder = new XuggleVideoRecorder(file);}

   286     

   287     Callable<Object> thunk = new Callable<Object>(){

   288 	public Object call(){

   289 	    ViewPort viewPort = 

   290 	    app.getRenderManager()

   291 	    .createPostView("aurellem record", app.getCamera());

   292 	    viewPort.setClearFlags(false, false, false);

   293 	    // get GUI node stuff

   294 	    for (Spatial s : app.getGuiViewPort().getScenes()){

   295 		viewPort.attachScene(s);

   296 	    }

   297 	    app.getStateManager().attach(videoRecorder);

   298 	    viewPort.addProcessor(videoRecorder);

   299 	    return null;

   300 	}

   301     };

   302     app.enqueue(thunk);

   303 }

   304 #+end_src

   305 

   306 This method selects the appropriate =VideoRecorder= class for the file

   307 type you specify, and instructs your application to record video to

   308 the file.

   309 

   310 Now that you have a =captureVideo= method, you use it like this:

   311 

   312   - Establish an =Isotimer= and set its framerate :: For example, if

   313        you want to record video with a framerate of 30 fps, include

   314        the following line of code somewhere in the initializtion of

   315        your application: 

   316 #+begin_src java :exports code

   317 this.setTimer(new IsoTimer(30));

   318 #+end_src

   319 

   320   - Choose the output file :: If you want to record from the game's

   321        main =ViewPort= to a file called =/home/r/record.flv=, then

   322        include the following line of code somewhere before you call

   323        =app.start()=;

   324 

   325   #+begin_src java :exports code

   326 Capture.captureVideo(app, new File("/home/r/record.flv"));

   327   #+end_src

   328 

   329   

   330 ** Simple example

   331 

   332 

   333 This example will record video from the ocean scene from the

   334 JMonkeyEngine test suite.

   335 #+begin_src java

   336 File video = File.createTempFile("JME-water-video", ".avi");

   337 captureVideo(app, video);

   338 app.start();

   339 System.out.println(video.getCanonicalPath());

   340 #+end_src

   341 

   342 

   343 I've added support for this under a class called

   344 =com.aurellem.capture.Capture=. You can get it [[http://hg.bortreb.com/jmeCapture/][here]].

   345 

   346 

   347 ** Hello Video! example

   348 

   349 I've taken [[http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/helloworld/HelloLoop.java][=./jme3/src/test/jme3test/helloworld/HelloLoop.java=]] and

   350 augmented it with video output as follows:

   351 

   352 =./src/com/aurellem/capture/examples/HelloVideo.java=

   353 #+include ../../src/com/aurellem/capture/examples/HelloVideo.java src java

   354 

   355 The videos are created in the =hello-video= directory

   356 

   357 #+begin_src sh :results verbatim :exports both

   358 du -h hello-video/*

   359 #+end_src

   360 

   361 #+results:

   362 : 932K	hello-video/hello-video-moving.flv

   363 : 640K	hello-video/hello-video-static.flv

   364 

   365 And can be immediately uploaded to youtube

   366 

   367 - [[http://www.youtube.com/watch?v=C8gxVAySaPg][hello-video-moving.flv]]

   368 #+BEGIN_HTML

   369 <iframe width="425" height="349" 

   370 	src="http://www.youtube.com/embed/C8gxVAySaPg" 

   371 	frameborder="0" allowfullscreen>

   372 </iframe>

   373 #+END_HTML

   374 - [[http://www.youtube.com/watch?v=pHcFOtIS07Q][hello-video-static.flv]]

   375 #+BEGIN_HTML

   376 <iframe width="425" height="349" 

   377 	src="http://www.youtube.com/embed/pHcFOtIS07Q" 

   378 	frameborder="0" allowfullscreen>

   379 </iframe>

   380 

   381 #+END_HTML

   382 

   383   

   384 * COMMENT More Examples

   385 ** COMMENT Hello Physics

   386 

   387 =HelloVideo= is boring. Let's add some video capturing to

   388 =HelloPhysics= and create something fun!

   389 

   390 This example is a modified version of =HelloPhysics= that creates four

   391 simultaneous views of the same scene of cannonballs careening into a

   392 brick wall.

   393 

   394 =./jme3/src/test/jme3test/helloworld/HelloPhysicsWithVideo.java=

   395 #+include ./jme3/src/test/jme3test/helloworld/HelloPhysicsWithVideo.java src java

   396 

   397 Running the program outputs four videos into the =./physics-videos=

   398 directory.

   399 

   400 #+begin_src sh :exports both :results verbatim

   401 ls ./physics-videos | grep -

   402 #+end_src

   403 

   404 #+results:

   405 : lower-left.flv

   406 : lower-right.flv

   407 : upper-left.flv

   408 : upper-right.flv

   409 

   410 The videos are fused together with the following =gstreamer= commands:

   411 

   412 #+begin_src sh :results silent

   413 cd physics-videos

   414 

   415 gst-launch-0.10 \

   416  filesrc location=./upper-right.flv ! decodebin ! \

   417  videoscale ! ffmpegcolorspace ! \

   418  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   419  videobox border-alpha=0 left=-640 ! \

   420  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   421  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   422  jpegenc ! avimux  ! filesink location=upper.flv \

   423  \

   424  filesrc location=./upper-left.flv ! decodebin ! \

   425  videoscale ! ffmpegcolorspace ! \

   426  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   427  videobox right=-640 ! mix.

   428 #+end_src

   429 

   430 #+begin_src sh :results silent

   431 cd physics-videos

   432 

   433 gst-launch-0.10 \

   434  filesrc location=./lower-left.flv ! decodebin ! \

   435  videoscale ! ffmpegcolorspace ! \

   436  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   437  videobox border-alpha=0 left=-640 ! \

   438  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   439  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   440  jpegenc ! avimux  ! filesink location=lower.flv \

   441  \

   442  filesrc location=./lower-right.flv ! decodebin ! \

   443  videoscale ! ffmpegcolorspace ! \

   444  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   445  videobox right=-640 ! mix.

   446 #+end_src

   447 

   448 #+begin_src sh :results silent

   449 cd physics-videos

   450 

   451 gst-launch-0.10 \

   452  filesrc location=./upper.flv ! decodebin ! \

   453  videoscale ! ffmpegcolorspace ! \

   454  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   455  videobox border-alpha=0 bottom=-480 ! \

   456  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   457  video/x-raw-yuv, width=1280, height=960, framerate=25/1 ! \

   458  jpegenc ! avimux  ! filesink location=../youtube/helloPhysics.flv \

   459  \

   460  filesrc location=./lower.flv ! decodebin ! \

   461  videoscale ! ffmpegcolorspace ! \

   462  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   463  videobox top=-480 ! mix.

   464 #+end_src

   465 

   466 #+begin_src sh :results verbatim

   467 du -h youtube/helloPhysics.flv

   468 #+end_src

   469 

   470 #+results:

   471 : 180M	physics-videos/helloPhysics.flv

   472 

   473 

   474 Thats a terribly large size!

   475 Let's compress it:

   476 

   477 ** COMMENT Compressing the HelloPhysics Video

   478 First, we'll scale the video, then, we'll decrease it's bitrate. The

   479 end result will be perfect for upload to YouTube.

   480 

   481 #+begin_src sh :results silent

   482 cd youtube

   483 

   484 gst-launch-0.10 \

   485  filesrc location=./helloPhysics.flv ! decodebin ! \

   486  videoscale ! ffmpegcolorspace ! \

   487  `: # the original size is 1280 by 960` \

   488  video/x-raw-yuv, width=1280, height=960, framerate=25/1 ! \

   489  videoscale ! \

   490  `: # here we scale the video down` \

   491  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   492  `: # and here we limit the bitrate` \

   493  theoraenc bitrate=1024 quality=30 ! \

   494  oggmux ! progressreport update-freq=1 ! \

   495  filesink location=./helloPhysics.ogg 

   496 #+end_src

   497 

   498 #+begin_src sh :results verbatim

   499 du -h youtube/helloPhysics.ogg

   500 #+end_src

   501 

   502 #+results:

   503 : 13M	youtube/helloPhysics.ogg

   504 

   505 [[http://www.youtube.com/watch?v=WIJt9aRGusc][helloPhysics.ogg]]

   506 

   507 #+begin_html

   508 <iframe width="425" height="349" 

   509 	src="http://www.youtube.com/embed/WIJt9aRGusc?hl=en&fs=1" 

   510 	frameborder="0" allowfullscreen>

   511 </iframe>

   512 #+end_html

   513 

   514 

   515 ** COMMENT failed attempts

   516 Let's try the [[http://diracvideo.org/][Dirac]] video encoder.

   517 

   518 #+begin_src sh :results verbatim

   519 cd youtube

   520 START=$(date +%s) 

   521 gst-launch-0.10 \

   522  filesrc location=./helloPhysics.flv ! decodebin ! \

   523  videoscale ! ffmpegcolorspace ! \

   524  video/x-raw-yuv, width=1280, height=960, framerate=25/1 ! \

   525  schroenc ! filesink location=./helloPhysics.drc > /dev/null

   526 echo `expr $(( $(date +%s) - $START))`

   527 #+end_src

   528 

   529 

   530 #+results:

   531 : 142

   532 

   533 That took 142 seconds. Let's see how it does compression-wise:

   534 

   535 #+begin_src sh :results verbatim

   536 du -h ./youtube/helloPhysics.drc

   537 #+end_src

   538 

   539 #+results:

   540 : 22M	./physics-videos/helloPhysics.drc

   541 

   542 

   543 #+begin_src sh :results verbatim

   544 cd youtube

   545 START=$(date +%s) 

   546 gst-launch-0.10 \

   547  filesrc location=./helloPhysics.flv ! decodebin ! \

   548  videoscale ! ffmpegcolorspace ! \

   549  video/x-raw-yuv, width=1280, height=960, framerate=25/1 ! \

   550  theoraenc ! oggmux ! filesink location=./helloPhysics.ogg \

   551  > /dev/null

   552 echo `expr $(( $(date +%s) - $START))`

   553 #+end_src

   554 

   555 #+results:

   556 : 123

   557 

   558 #+begin_src sh :results verbatim

   559 du -h youtube/helloPhysics.ogg

   560 #+end_src

   561 

   562 #+results:

   563 : 59M	physics-videos/helloPhysics.ogg

   564 

   565 

   566 =*.drc= files can not be uploaded to YouTube, so I'll go for the

   567 avi file.

   568 

   569 

   570 ** COMMENT text for videos

   571 Video output from JMonkeyEngine3 (www.jmonkeyengine.org/) using Xuggle

   572 (www.xuggle.com/).  Everything is explained at

   573 http://aurellem.org/cortex/capture-video.html.

   574 

   575 

   576 Video output from JMonkeyEngine3 (www.jmonkeyengine.org/) HelloPhysics

   577 demo application using Xuggle (www.xuggle.com/).  Everything is

   578 explained at http://aurellem.org/cortex/capture-video.html.  Here,

   579 four points of view are simultaneously recorded and then glued

   580 together later.

   581 

   582 JME3 Xuggle Aurellem video capture

   583  

   584  

   585 * Showcase of recorded videos

   586 I encoded most of the original JME3 Hello demos for your viewing

   587 pleasure, all using the =Capture= and =IsoTimer= classes.

   588 

   589 ** HelloTerrain

   590 [[http://youtu.be/5_4wyDFwrVQ][HelloTerrain.avi]]

   591 

   592 #+begin_html

   593 <iframe width="425" height="349" 

   594 	src="http://www.youtube.com/embed/5_4wyDFwrVQ" 

   595 	frameborder="0" allowfullscreen>

   596 </iframe>

   597 #+end_html

   598 

   599 ** HelloAssets

   600 [[http://www.youtube.com/watch?v=oGg-Q6k1BM4][HelloAssets.avi]]

   601 

   602 #+begin_html

   603 <iframe width="425" height="349" 

   604 	src="http://www.youtube.com/embed/oGg-Q6k1BM4?hl=en&fs=1" 

   605 	frameborder="0" allowfullscreen>

   606 </iframe>

   607 #+end_html

   608 

   609 ** HelloEffects

   610 [[http://www.youtube.com/watch?v=TuxlLMe53hA][HelloEffects]]

   611 

   612 #+begin_html

   613 <iframe width="425" height="349" 

   614 	src="http://www.youtube.com/embed/TuxlLMe53hA?hl=en&fs=1" 

   615 	frameborder="0" allowfullscreen>

   616 </iframe>

   617 #+end_html

   618 

   619 ** HelloCollision

   620 [[http://www.youtube.com/watch?v=GPlvJkiZfFw][HelloCollision.avi]]

   621 

   622 #+begin_html

   623 <iframe width="425" height="349" 

   624 	src="http://www.youtube.com/embed/GPlvJkiZfFw?hl=en&fs=1" 

   625 	frameborder="0" allowfullscreen>

   626 </iframe>

   627 #+end_html

   628 

   629 ** HelloAnimation

   630 [[http://www.youtube.com/watch?v=SDCfOSPYUkg][HelloAnimation.avi]]

   631 

   632 #+begin_html

   633 <iframe width="425" height="349" 

   634 	src="http://www.youtube.com/embed/SDCfOSPYUkg?hl=en&fs=1" 

   635 	frameborder="0" allowfullscreen>

   636 </iframe>

   637 #+end_html

   638 

   639 ** HelloNode

   640 [[http://www.youtube.com/watch?v=pL-0fR0-ilQ][HelloNode.avi]]

   641 

   642 #+begin_html

   643 <iframe width="425" height="349" 

   644 	src="http://www.youtube.com/embed/pL-0fR0-ilQ?hl=en&fs=1" 

   645 	frameborder="0" allowfullscreen>

   646 </iframe>

   647 #+end_html

   648 

   649 ** HelloLoop

   650 [[http://www.youtube.com/watch?v=mosZzzcdE5w][HelloLoop.avi]]

   651 

   652 #+begin_html

   653 <iframe width="425" height="349" 

   654 	src="http://www.youtube.com/embed/mosZzzcdE5w?hl=en&fs=1" 

   655 	frameborder="0" allowfullscreen>

   656 </iframe>

   657 #+end_html

   658 

   659 

   660 *** COMMENT x-form the other stupid 

   661 progressreport update-freq=1 

   662 

   663 gst-launch-0.10 \

   664  filesrc location=./helloPhy ! decodebin ! \

   665  videoscale ! ffmpegcolorspace ! \

   666  video/x-raw-yuv, width=1280, height=960, framerate=25/1 ! \

   667  x264enc ! avimux ! filesink location=helloPhysics.avi \

   668 

   669 

   670 gst-launch-0.10 \

   671  filesrc location=./HelloAnimationStatic.flv ! decodebin ! \

   672  videoscale ! ffmpegcolorspace ! \

   673  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   674  videobox border-alpha=0 left=-640 ! \

   675  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   676  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   677   x264enc ! avimux ! progressreport update-freq=1 ! \

   678   filesink location=../youtube/HelloAnimation.avi \

   679  \

   680  filesrc location=./HelloAnimationMotion.flv ! decodebin ! \

   681  videoscale ! ffmpegcolorspace ! \

   682  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   683  videobox right=-640 ! mix.

   684 

   685 gst-launch-0.10 \

   686  filesrc location=./HelloCollisionMotion.flv ! decodebin ! \

   687  videoscale ! ffmpegcolorspace ! \

   688  video/x-raw-yuv, width=800, height=600, framerate=25/1 ! \

   689  x264enc bitrate=1024 ! avimux ! \

   690  filesink location=../youtube/HelloCollision.avi 

   691 

   692 gst-launch-0.10 \

   693  filesrc location=./HelloEffectsStatic.flv ! decodebin ! \

   694  videoscale ! ffmpegcolorspace ! \

   695  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   696  videobox border-alpha=0 left=-640 ! \

   697  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   698  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   699   x264enc bitrate=1024 ! avimux ! progressreport update-freq=1 ! \

   700   filesink location=../youtube/HelloEffects.avi \

   701  \

   702  filesrc location=./HelloEffectsMotion.flv ! decodebin ! \

   703  videoscale ! ffmpegcolorspace ! \

   704  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   705  videobox right=-640 ! mix.

   706 

   707 gst-launch-0.10 \

   708  filesrc location=./HelloTerrainMotion.flv ! decodebin ! \

   709  videoscale ! ffmpegcolorspace ! \

   710  video/x-raw-yuv, width=800, height=600, framerate=25/1 ! \

   711  x264enc bitrate=1024 ! avimux ! \

   712  filesink location=../youtube/HelloTerrain.avi 

   713 

   714 

   715 gst-launch-0.10 \

   716  filesrc location=./HelloAssetsStatic.flv ! decodebin ! \

   717  videoscale ! ffmpegcolorspace ! \

   718  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   719  videobox border-alpha=0 left=-640 ! \

   720  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   721  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   722   x264enc bitrate=1024 ! avimux ! progressreport update-freq=1 ! \

   723   filesink location=../youtube/HelloAssets.avi \

   724  \

   725  filesrc location=./HelloAssetsMotion.flv ! decodebin ! \

   726  videoscale ! ffmpegcolorspace ! \

   727  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   728  videobox right=-640 ! mix.

   729 

   730 

   731 gst-launch-0.10 \

   732  filesrc location=./HelloNodeStatic.flv ! decodebin ! \

   733  videoscale ! ffmpegcolorspace ! \

   734  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   735  videobox border-alpha=0 left=-640 ! \

   736  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   737  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   738   x264enc bitrate=1024 ! avimux ! progressreport update-freq=1 ! \

   739   filesink location=../youtube/HelloNode.avi \

   740  \

   741  filesrc location=./HelloNodeMotion.flv ! decodebin ! \

   742  videoscale ! ffmpegcolorspace ! \

   743  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   744  videobox right=-640 ! mix.

   745 

   746 gst-launch-0.10 \

   747  filesrc location=./HelloLoopStatic.flv ! decodebin ! \

   748  videoscale ! ffmpegcolorspace ! \

   749  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   750  videobox border-alpha=0 left=-640 ! \

   751  videomixer name=mix ! ffmpegcolorspace ! videorate ! \

   752  video/x-raw-yuv, width=1280, height=480, framerate=25/1 ! \

   753   x264enc bitrate=1024 ! avimux ! progressreport update-freq=1 ! \

   754   filesink location=../youtube/HelloLoop.avi \

   755  \

   756  filesrc location=./HelloLoopMotion.flv ! decodebin ! \

   757  videoscale ! ffmpegcolorspace ! \

   758  video/x-raw-yuv, width=640, height=480, framerate=25/1 ! \

   759  videobox right=-640 ! mix.
author	Robert McIntyre <rlm@mit.edu>
date	Fri, 17 Feb 2012 13:03:58 -0700
parents	7351c9c0c471
children	7e7f8d6d9ec5