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gtspring2009:howto:format [2009/04/06 16:46]
gibson
gtspring2009:howto:format [2010/02/02 07:55]
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-====== How to format movies ====== 
  
-===== matlab ===== 
- 
-You can make movies in Matlab using %%avifile%% and related Matlab commands. 
-The basics of this are 
- 
-  aviobj = avifile(filename,​ '​fps',​ fps); 
-  for n=1:​N; ​ 
-    ...make a plot... 
-    fr = getframe(gcf);​ 
-    aviobj = addframe(aviobj,​ fr); 
-  end 
-  aviobj = aviobj(close) 
- 
-See %%makemovie.m%% in the channelflow distribution for a complete example. 
- 
-===== conversion and compression ===== 
- 
-On Linux Matlab produces only uncompressed AVI files. These can be huge (gigabytes). You can compress 
-the AVIs and convert to other formats using %%mencoder%% (a command-line utility that usually is installed ​ 
-as part of the %%Mplayer%% package. ​ 
- 
-To compress and save as AVI, run 
- 
-    mencoder -nosound -ovc lavc -of avi -lavcopts vcodec=wmv2:​vbitrate=1600 input.avi -o output.avi 
- 
-To compress and save as FLV (flash video), run 
- 
-    mencoder -nosound -of lavf -lavfopts format=flv -ovc lavc -lavcopts vcodec=flv:​vmax_b_frames=0:​vbitrate=1600 input.avi -o output.flv 
- 
-You will probably need to adjust the bitrate (here 1600) to get a good balance of file size and video quality. 
-For convenience you can turn these commands into shell functions by placing the following in a bash start-up file 
-(probably either %%~/​.bashrc%% or %%~/​.bash_aliases%%). 
- 
-   ​function avicompress() { 
-     ​mencoder -nosound -ovc lavc -of avi -lavcopts vcodec=wmv2:​vbitrate=$1 $2 -o $3 
-   } 
-   ​function flvcompress() { 
-     ​mencoder -nosound -of lavf -lavfopts format=flv -ovc lavc -lavcopts vcodec=flv:​vmax_b_frames=0:​vbitrate=$1 $2 -o $3 
-   } 
- 
-which can then be run as follows 
- 
-   ​avicompress 1600 input.avi output.avi 
-   ​flvcompress 1600 input.avi output.flv ​   
- 
-===== obsolete conversion scripts ===== 
- 
-I used to be able to convert to Quicktime and MP4 using these scripts, but mp4creator is now unsupported ​ 
-and it no longer compiles. ​ 
- 
-  function mp4compress() { 
-    mencoder $2 -ovc x264 -x264encopts bitrate=$1 -nosound -o tmp.avi 
-    mplayer -nolirc -nojoystick tmp.avi -dumpvideo -dumpfile tmp.h264 
-    rm -f $3 
-    mp4creator -create=tmp.h264 -rate=10 $3 
-    rm tmp.h264 tmp.avi 
-    mp4creator -hint=1 $3 
-    mp4creator -optimize $3 
-    mp4creator -list $3 
-  } 
-  function movcompress() { 
-    mencoder -nosound -ovc x264 $1 -o tmp.avi 
-    mplayer tmp.avi -dumpvideo -dumpfile tmp.h264 
-    mp4creator -create=tmp.h264 -rate=29.97 tmp.mp4 
-    mp4creator -hint=1 tmp.mp4 
-    mp4creator -optimize tmp.mp4 
-    mencoder -nosound -ovc copy -of lavf -o $2 tmp.mp4 -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames 
-  } 
-  function mp2compress() { 
-    ffmpeg -i $2 -vcodec mpeg2video -b ${1}k  $3  
-  } 
-  function mp1compress() { 
-    ffmpeg -i $2 -vcodec mpeg1video -b ${1}k  $3  
-  } 
- 
-====== Preferences ​ ====== 
- 
-Please make all videos and images in standard sizes and colors. This makes it much easier to display them in [[http://​chaosbook.org/​tutorials/​index.html|web tutorials]] etc. --Predrag 
- 
- 
-===== Videos ===== 
- 
-  * Create a flash video file ''​NameFile.flv''​ and a ''​NameFile.png''​ image of the same size  
-    * for 3D video of a plane Couette solution use **400 x 300** pixels 
-    * for a dual view state space/3D fluid use     **720 x 300** pixels 
-    * NameFile: 
-      * for periodic orbits ''​NameFile.flv = P35p77.flv''​ if the period is **T=35.77** 
-      * for equilibria follow Halcrow et al papers, as in [[http://​www.channelflow.org/​database/​|channelflow.org database]] 
-      * if you are replotting the same solution, DO NOT give it a new name (dokuwiki has old versions saved) 
-    * color: use **white background** 
-    * framing: please **crop movies** so they have as little dead area along the edges as possible 
-===== Figures ===== 
- 
-  * pre-publication quality ​ images 
-    * for pdflaTeX: ''​NameFile.png''​ (not ''​NameFile.jpg'',​ etc.) **800 x ???** pixels (fixed width, not sure **800** is optimal...) 
-    * for laTeX (inclusion in ChaosBook.org,​ etc): ''​NameFile.eps''​ not larger thank 60KB, preferably 5-10KB 
- 
- 
-====== How to resize PNGs ====== 
- 
-To convert a PNG figure to the pixel size you prefer, use the ImageMagick %%convert%% command. For example, 
- 
-<​code>​ 
-convert -resize 400x300 bigfig.png justright.png 
-</​code>​ 
- 
-converts the 560x420 pixel figure %%bigfig.png%% to a 400x300 pixel figure %%justright.png%%. 
- 
-{{:​gtspring2009:​howto:​bigfig.png|bigfig.png}} {{:​gtspring2009:​howto:​justright.png|justright.png}} 
gtspring2009/howto/format.txt ยท Last modified: 2010/02/02 07:55 (external edit)