hachoir / hachoir-tools / README.hachoir-strip

hachoir-strip is an experimental program based on Hachoir library: it removes
"useless" informations from a file. Don't use it to create smaller file, you
have better to recompress your data :-) hachoir-strip can be used if you would
like to remove spy information which can be used to know the origin of a file.


Our victim::
    $ hachoir-metadata KDE_Click.wav.new
    - Creation date: 2001-02-21   <== here they are
    - Producer: Sound Forge 4.5   <== spy informations :-)
    - MIME type: audio/x-wav
    - Endian: Little endian
    - Duration: 39 ms

Clean up the file::
    $ hachoir-strip KDE_Click.wav
    [+] Process file KDE_Click.wav
    Remove field /info
    Remove 56 bytes (3.1%)
    Save new file into KDE_Click.wav.new

    $ hachoir-metadata KDE_Click.wav.new
    - MIME type: audio/x-wav
    - Endian: Little endian
    - Duration: 39 ms

So hachoir-strip removed creation date (2001-02-21) and producer (software
used to record/edit the sound: Sound Forge 4.5). The file is also 56 bytes

Option --strip

You can select field types to remove using --strip:

 * (default): remove all useless fields
 * --strip=useless: remove really useless fields (eg. padding)
 * --strip=metadata: remove metadata like ID3 tags and EXIF and IPTC metadatas
 * --strip=index: remove video index

You can combine options with comma: --strip="useless,metadata".


 * Hachoir library:
 * hachoir-strip program:
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.