NAME

RIFF::Info - Probe DivX, AVI, and ASF files for attributes like:

 -video codec
 -audio codec
 -frame height
 -frame width
 -frame count

and more!

SYNOPSIS

  use RIFF::Info;

  my $video;

  $video = RIFF::Info->new($filename);             #like this
  $video = RIFF::Info->new($filename,$headersize); #or this

  $self->probe;                           #parse the video file
  $video->vcodec;                         #video codec
  $video->acodec;                         #audio codec
  ...

DESCRIPTION

METHODS

RIFF::Info has one constructor, new(). It must be called with a filename, and an optional header size (see BUGS). Returns a RIFF::Info object if the file was opened successfully.

Call probe() on the RIFF::Info object to parse the file. This does a series of sysread()s on the file to figure out what the properties are.

Now, call one (or more) of these methods to get the low-down on your file:

 method              returns
 ---------------------------------------------------
 achans()            number of audio channels
 acodec()            audio codec
 acodecraw()         audio codec numeric ID
 arate()             audio bitrate
 astreams()          number of audio streams
 fps()               frames/second
 height()            frame width in pixels
 scale()             video bitrate
 type()              type of file data.  RIFF or AVI.
 vcodec()            video codec
 vframes()           number of frames
 vrate()             video bitrate
 vstreams()          number of video streams
 width()             frame height in pixels

BUGS (AKA FEATURES)

The default header_size() (10K) may not be large enough to successfully extract the video/audio attributes for all RIFF files. If this module fails you, consider increasing the RIFF header size. If it still fails, let me know.

Audio codec name mapping is incomplete. If you know the name that corresponds to an audio codec ID that I don't, tell me.

AUTHOR

Allen Day <allenday@ucla.edu> Copyright (c) 2002, Allen Day

You may enjoy this module under the same terms as Perl itself.

ACKNOWLEDGMENTS

This was written with liberal snarfing from transcode, a linux video stream processing tool available from:

http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode/