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gtspring2009:howto:format

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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 ====== Images ====== * 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.1241180505.txt.gz · Last modified: 2009/05/01 05:21 by predrag