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How to handle broken/copy protected VOB files? 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19504 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2006-08-23 07:19:42 +00:00
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DOCS/xml/en/faq.xml
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@ -987,6 +987,30 @@ mencoder <replaceable>input.avi</replaceable> -ovc copy -oac copy -o <replaceabl
</para></answer>
</qandaentry>
<qandaentry>
<question><para>
How can I backup and encode a VOB file with a broken beginning?
</para></question>
<answer><para>
The main problem when you want to encode a VOB file which is corrupted
<footnote id='fn-corrupted-files-or-copy-protection'><para>
To some extent, some forms of copy protection used in DVDs can be
assumed to be content corruption.
</para></footnote>
is that it will be hard to get an encode with perfect A/V sync.
One workaround is to just shave off the corrupted part and encode just the
clean part.
First you need to find where the clean part starts:
<screen>
mplayer <replaceable>input.vob</replaceable> -sb <replaceable>nb_of_bytes_to_skip</replaceable>
</screen>
Then you can create a new file which contains just the clean part:
<screen>
dd if=<replaceable>input.vob</replaceable> of=<replaceable>output_cut.vob</replaceable> skip=1 ibs=<replaceable>nb_of_bytes_to_skip</replaceable>
</screen>
</para></answer>
</qandaentry>
<qandaentry>
<question><para>
I can't encode DVD subtitles into the AVI!