gtspring2009:howto:format
====== Differences ====== This shows you the differences between two versions of the page.
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gtspring2009:howto:format [2009/02/10 03:56] predrag created Movie formats page |
gtspring2009:howto:format [2010/02/02 07:55] (current) |
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| - | ====== Movie formatting conventions ====== | + | ====== How to format movies ====== |
| - | 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. | + | ===== 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 | ||
| - | If you learn some dark matlab arts that enable you to improve videos, please enter these secrets here. | ||
| ===== Videos ===== | ===== Videos ===== | ||
| Line 17: | Line 93: | ||
| * framing: please **crop movies** so they have as little dead area along the edges as possible | * 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.1234266977.txt.gz · Last modified: 2009/02/10 03:56 by predrag
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