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Top Forums UNIX for Dummies Questions & Answers gzip produces different output from the same input Post 302433291 by chebarbudo on Tuesday 29th of June 2010 07:14:37 AM
Old 06-29-2010
Thanks pludi.
The thing is that I ran gzip for the exact same file twice:
Code:
santiago:~$ cp original copy
santiago:~$ gzip copy
santiago:~$ md5sum copy.gz
603343de9a6c295f00dc4759f6919031  copy.gz
santiago:~$ rm copy.gz
santiago:~$ cp original copy
santiago:~$ gzip copy
santiago:~$ md5sum copy.gz
e4da2538a243cb49cf6212a0a20a60ce  copy.gz

How can it be different?
 

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gst-md5sum-0.8(1)						   User Commands						 gst-md5sum-0.8(1)

NAME
gst-md5sum-0.8, gst-md5sum - get an md5sum of a GStreamer pipeline through md5sink SYNOPSIS
gst-md5sum-0.8 [--verbose] [gst-std-options] [partial-pipeline-description] gst-md5sum [--verbose] [gst-std-options] [partial-pipeline-description] [--gst-list-mm] [--gst-mm=string] [--print] DESCRIPTION
gst-md5sum-0.8 generates MD5 checksums of the data generated by a GStreamer pipeline. In theory, both of the following commands should print out the same checksum: gst-md5sum-0.8 filesrc location=music.mp3 md5sum music.mp3 If the pipeline contains an md5sink element, gst-md5sum-0.8 queries it for the md5sum at the end of pipeline iteration. If the pipeline does not contain an md5sink element, gst-md5sum-0.8 automatically connects an md5sink to the right-hand side of the given pipeline. See gst-launch(1) or the GStreamer documentation for more information on how to create a partial-pipeline-description. gst-md5sum is a wrapper script that runs the latest installed version of gst-md5sum-X.X. For example, if both gst-md5sum-0.7 and gst- md5sum-0.8 are installed on your system, gst-md5sum runs gst-md5sum-0.8. OPTIONS
The following options are supported by gst-md5sum-0.8 and gst-md5sum: --verbose Output verbose information. You can also use -v to specify this option. gst-std-options Standard options available for use with most GStreamer applications. See gst-std-options(5) for more information. The following options are supported by gst-md5sum only: --gst-list-mm List found major/minor versions. This option displays the versions that are available. --gst-mm=string Force major/minor version. This option enables you to specify a specific version to run, if you do not want to run the default version. --print Print wrapped command line. This option displays the command that will be run, and then runs the command. OPERANDS
The following operands are supported: partial-pipelinePartialppipeline description. EXAMPLES
Example 1: Running the Wrapper Script and Displaying the Command Name example% gst-md5sum --print /usr/bin/gst-md5sum-0.8 FILES
The following files are used by this application: /usr/bin/gst-md5sum-0.8 Executable for GNOME help browser /usr/bin/gst-md5sum Wrapper script that runs the latest installed version of gst-md5sum-X.X ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-media | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
gst-complete(1), gst-compprep(1), gst-feedback(1), gst-inspect(1), gst-launch(1), gst-launch-ext(1), gst-register(1), gst-thumbnail(1), gst-typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3), gst-std-options(5) NOTES
Original man page written by the GStreamer team at http://gstreamer.net/. Updated by Brian Cameron, Sun Microsystems Inc., 2004. SunOS 5.10 14 Oct 2004 gst-md5sum-0.8(1)
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