06-29-2010
gzip produces different output from the same input
Hi there,
I'm puzzled. Compressing the same file (same name, same md5sum) at two different times will produce a different output. I mean the md5sum of the resulting .gz files are different.
Does it make any sens to any of you?
I'd like some explanations if you know what's going on.
Thanks
Santiago
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LEARN ABOUT DEBIAN
gst-md5sum-0.8
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)