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How to Make an MPEG Movie NERSC User Training, Berkeley, CA

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Standard (ISO) movie compression format for storing video ... avoid potential problems with some MPEG encoders, the x, y dimensions should be divisible by 16. ... – PowerPoint PPT presentation

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Title: How to Make an MPEG Movie NERSC User Training, Berkeley, CA


1
How to Make an MPEG Movie NERSC User Training,
Berkeley, CA
  • LBNL/NERSC Visualization Group
  • November 6, 2009

graphics_at_nersc.gov
2
What is MPEG-1
  • Standard (ISO) movie compression format for
    storing video and audio.
  • Useful for creating movies for CD-ROMs, the Web,
    and playback on a computer.
  • Compression is done within a frame (interframe
    encoding) and between frames (intraframe
    encoding).
  • MPEG-1 players are available on Mac, Unix, NT,
    and Windows platforms.
  • Other Common computer movie formats
  • Microsoft's .AVI
  • Apples QuickTime
  • For more information on making a MPEG movie
    seehttp//www-vis.lbl.gov/software/MPEGmovie.htm
    l

3
Before You Make A Movie
  • Create your images in the correct size for your
    movie. For example, 640x480 or 320x240.
  • To avoid potential problems with some MPEG
    encoders, the x, y dimensions should be divisible
    by 16.
  • Your image files should be sequentially numbered
    with the same number of digits. Correct
    filenames are
  • file000.jpeg, file001.jpeg,.file999.jpeg
  • 01.tiff, 02.tiff,99.tiff
  • Acceptable image formats are ppm, pnm, jpeg,
    tiff, etc.
  • Keep your frames uncluttered.
  • Avoid thin lines, dark blue lines on a black
    background, small objects, highly saturated
    colors, stripes, etc.
  • Don't use the GIF format if you have more than
    256 colors.

4
Thin Lines Movie
5
Blue Lines Movie
6
MPEG Movie Making
  • Two ways of encoding MPEG movies are available at
    NERSC on escher.nersc.gov
  • mpeg_encode from UC Berkeley
  • mediaconvert (SGI tool)
  • They will produced different movies, try them
    both

7
mediaconvert Movie
8
mpeg_encode Movie
9
Advantages of mediaconvert
  • Has a GUI interface - easier to change the
    various parameters.
  • Transparently converts most image formats.
  • Images can be smoothed before compression.

10
mediaconvert - no Smoothing
11
mediaconvert - with Smoothing
12
Advantages of mpeg_encode
  • Freely available on most Unix computer systems.
  • Usually creates smaller files.
  • Faster?

13
Making a Movie with mediaconvert
  • Follow steps exactly on escher.nersc.gov
  • setenv DISPLAY ltyour X hostgt0
  • mediaconvert
  • Enter the directory name where your image files
    are stored in the "Video to Convert" box. Press
    ltEntergt to confirm your input.
  • Under the "Video to Convert" box, a new selection
    will appear, select "Numbered Images". More
    selection boxes will appear.

14
mediaconvert - Initial Settings
15
mediaconvert (cont.)
  • If your files are named test001.jpg to
    test119.jpg
  • Enter test.jpg in the "File Template" box (a
    '' signifies a single digit). Do not press
    ltEntergt.
  • Type in 119 in the "End" box and press ltEntergt.
  • Type in 000 in "Start" box and press ltEntergt.
  • Put the cursor in the "File Template" box and
    press ltEntergt. If everything is correct, a pop-up
    window titled "Video Input Parameters" will
    appear.
  • Select "Close".

16
mediaconvert Menu- after Image and Video Settings
17
Making a Movie with mediaconvert
  • Change "File Format" from "QuickTime" to "MPEG-1
    Video".
  • Select "Image Size. On the pop-up sub-menu make
    sure that the "Frame Size" is set to "Original
    Size.
  • Select "Video Parameters" from the main menu. On
    the pop-up sub-menu change the "Frame Rate" to
    30.
  • If needed, modify the "Output File Name"
    (directory and filename) on the main menu.
  • Select "Start" from the main menu.
  • When finished, try out your movie with mpeg_play,
    SGI's movieplayer (if you have OpenGL installed
    on your workstation), or any other MPEG player.

18
mediaconvert Menu - sizing
19
Mediaconvert Menu - frame rate
20
Making a Movie with mpeg_encode
  • module load mpeg_encode.
  • The settings for mpeg_encode are controlled by an
    ASCII text parameter file (sample file located in
    MPEG_DIR/sample_params.mpg). Some of the things
    you may want to modify
  • Change the "BASE_FILE_FORMAT" line to reflect the
    image file type. For example JPEG.
  • Change the "INPUT" line to reflect the name of
    your input image files. For example test.jpg
    000-100.
  • Start the movie making process by doing
  • mpeg_encode ltname of parameter filegt

21
Useful Tools
  • Image Conversion Tools
  • For information on the below software see
  • http//www-vis.lbl.gov/software.html
  • Imtools from San Diego Supercomputer Center.
  • imconv is useful to converting from one image
    file format to another.
  • imscale is good for changing the size of the
    image and changing the image format.
  • imstoryboard is useful to change the size, image
    format, and add margins.
  • Also check out the pbm and netpbm tools

22
Useful Tools (cont)
  • To convert your CGM movie file into JPEG files
    (called gmeta in this example)
  • module load ncar
  • ncgm2jpg gmeta
  • xv is very useful for displaying an image,
    converting a single image's format, and for
    checking on the dimensions of x and y.

23
Movie Tools
  • mpeg_play (module load mpeg_play) will play an
    MPEG-1 movie on a Unix system.
  • movieplayer from SGI tool place MPEG-1 and other
    movie formats (QT, AVI) if you have OpenGL
    installed on your system.
  • For analyzing your movie (frames, size,
    compression, etc.) see
  • mpeg_stat (module load mpeg_tools)
  • dminfo (available on escher.nersc.gov)
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