2013-01-17 02:25:56 +00:00
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<title>Mediaextract by panzi</title>
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<header>
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<h1>Mediaextract</h1>
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<h2>Extracts media files (AVI, Ogg, Wave, PNG, ...) that are embedded within other files.</h2>
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</header>
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<section id="downloads" class="clearfix">
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2013-01-17 03:05:37 +00:00
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<a href="mediaextract-2013-01-17.zip" id="download-zip" class="button"><span>mediaextract-2013-01-17.zip</span></a>
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2013-01-17 02:25:56 +00:00
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<a href="https://github.com/panzi/mediaextract" id="view-on-github" class="button"><span>View on GitHub</span></a>
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</section>
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<hr>
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<section id="main_content">
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<h1>Mediaextract</h1>
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<p>Extract media files that are embedded within other files.</p>
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<h2>Setup</h2>
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<pre><code>make builddir
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make
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sudo make install PREFIX=/usr
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</code></pre>
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<p>Cross compile for Windows (uses <code>i686-pc-mingw32-gcc</code>):</p>
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<pre><code>make TARGET=win32 builddir
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make TARGET=win32
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</code></pre>
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<p>Or (uses <code>x86_64-w64-mingw32-gcc</code>):</p>
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<pre><code>make TARGET=win64 builddir
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make TARGET=win64
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</code></pre>
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<p><strong>Warning:</strong> This program only works correctly on platforms that allow unaligned
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memory access (e.g. x86 and ARM, although it might be quite slow on the latter).</p>
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<p><strong>Note:</strong> 32bit binaries can only process 2 GB of a file at once. The rest of
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bigger files will be ignored. You need to run this program several times with
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different <code>--offset</code> values to process such a file whole.</p>
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<p>This also means that using a 32bit binary extracted files can never be larger
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than 2 GB.</p>
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<p>This is because <code>mediaextract</code> uses <code>mmap</code> to read files, wich maps files to
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memory. On 32bit platforms the address space of the main memory is simply not
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big enough. 64bit binaries can read up to 8 EB (8 Exabytes) at once.</p>
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<h2>Usage</h2>
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<pre><code>mediaextract [option...] <filename> [<filename> ...]
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</code></pre>
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<h3>Examples</h3>
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<p>Extract .wav, .aif and .ogg (might actually be .ogg, .opus or .ogm) files from
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the file <code>data.bin</code> and store them in the <code>~/Music</code> directory.</p>
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<pre><code>mediaextract -f riff,aiff,ogg -o ~/Music data.bin
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</code></pre>
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<p>This will then write files like such into <code>~/Music</code>:</p>
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<pre><code>data.bin_00000000.ogg
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data.bin_00FFB2E3.wav
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data.bin_01F3CD45.aif
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</code></pre>
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<p>The hexadecimal number in the written file names give the offset where in the
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data file the audio file was found.</p>
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<p>Extract .mp3, .mp2 and .mp1 files (with or without ID3v2 tags). The <code>mpg123</code>
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option yields a lot of false positives because there is no nice way to
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unambigiously detect MPEG files. These false positives are however usually very
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small, so using the <code>--min-size</code> option one can hopefully extract only real MPEG
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files.</p>
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<pre><code>mediaextract -f id3v2,mpg123 --min-size=100k -o ~/Music data.bin
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</code></pre>
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<h3>Options</h3>
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<pre><code>-h, --help Print this help message.
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-q, --quiet Do not print status messages.
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-s, --simulate Don't write any output files.
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-o, --output=DIR Directory where extracted files should be written. (default: ".")
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-i, --offset=OFFSET Start processing at byte OFFSET. (default: 0)
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-n, --length=LENGTH Only process LENGTH bytes.
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(default and maximum: 8 EB)
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-m, --min-size=SIZE Minumum size of extracted files (skip smaller). (default: 0)
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-x, --max-size=SIZE Maximum size of extracted files (skip larger).
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(default and maximum: 16 EB)
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The last character of OFFSET, LENGTH and SIZE may be one of the
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following:
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B (or none) for Bytes
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k for Kilobytes (units of 1024 Bytes)
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M for Megabytes (units of 1024 Kilobytes)
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G for Gigabytes (units of 1024 Megabytes)
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T for Terabytes (units of 1024 Gigabytes)
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P for Petabytes (units of 1024 Terabytes)
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E for Exabytes (units of 1024 Petabytes)
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The special value "max" selects the maximum alowed value.
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-f, --formats=FORMATS Comma separated list of formats (file magics) to extract.
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Supported formats:
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all all supported formats
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default the default set of formats (AIFF, ASF, AU, BINK, BMP,
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GIF, ID3v2, IT, JEPG, MIDI, MP4, Ogg, PNG, RIFF, S3M,
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SMK, XM)
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audio all audio files (AIFF, ASF, AU, ID3v2, IT, MIDI, MP4,
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Ogg, RIFF, S3M, XM)
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image all image files (BMP, PNG, JEPG, GIF)
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tracker all tracker files (MOD, S3M, IT, XM)
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video all video files (ASF, BINK, MP4, RIFF, SMK)
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aiff big-endian (Apple) wave files
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asf Advanced Systems Format files (also WMA and WMV)
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au Sun Microsystems audio file format (.au or .snd)
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bink BINK files
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bmp Windows Bitmap files
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gif Graphics Interchange Format files
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id3v2 MPEG layer 1/2/3 files with ID3v2 tags
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it ImpulseTracker files
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jepg JPEG Interchange Format files
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midi MIDI files
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mod Noisetracker/Soundtracker/Protracker Module files
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mpg123 MPEG layer 1/2/3 files (MP1, MP2, MP3)
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mp4 MP4 files (M4A, M4V, 3GPP etc.)
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ogg Ogg files (Vorbis, Opus, Theora, etc.)
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png Portable Network Graphics files
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riff Resource Interchange File Format files (ANI, AVI, MMM,
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PAL, RDI, RMI, WAV)
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s3m ScreamTracker III files
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smk Smaker files
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xm Extended Module files
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WARNING: Because MP1/2/3 files do not have a nice file magic, using
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the 'mpg123' format may cause *a lot* of false positives. Nowadays
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MP3 files usually have an ID3v2 tag at the start, so using the
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'id3v2' format is the better option anyway.
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The detection accuracy of MOD files is not much better and thus
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the 'mpg123' and 'mod' formats are per default disabled.
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NOTE: When using only the 'mpg123' format but not 'id3v2' any ID3v2
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tag will be stripped. ID3v1 tags will still be kept.
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If '-' is written before a format name the format will be
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removed from the set of formats to extract. E.g. extract
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everything except tracker files:
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mediaextract --formats=all,-tracker data.bin
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</code></pre>
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</section>
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<footer>
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Mediaextract is maintained by <a href="https://github.com/panzi">panzi</a><br>
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This page was generated by <a href="http://pages.github.com">GitHub Pages</a>. Tactile theme by <a href="http://twitter.com/jasonlong">Jason Long</a>.
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2013-01-17 03:05:37 +00:00
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