mirror of https://gitee.com/openkylin/libdv.git
82 lines
2.3 KiB
Plaintext
82 lines
2.3 KiB
Plaintext
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This is LibDV, a GPL codec for DV video.
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See http://libdv.sourceforge.net/
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LibDV now uses the GNU "Autotools" for building.
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BUILDING from CVS checkout
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==========================
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Starting with version 0.98, the libdv CVS repository does include the
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configure script generated by the autotools. Hopefully, this will
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ease the pain for people who are not inclined to modify their machines
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installation just to build libdv.
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If you do have such desire, you can still bootstrap the build
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with*:
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autoreconf -i
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You should check for any fatal errors, noting that you can expect some
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warnings which are harmless.
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To build the libdv library and the example player:
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./configure
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make
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The makefile generated by the autotools is very large, so the more
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useful targets don't jump out at you. Here are a few.
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Build a "tar.gz" distribution file:
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make dist
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Build a rpm package file. This requires you run as root, or you
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setup your ~/.rpmmacros to allow building rpms without root:
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make rpm
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Clean up objects and binaries:
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make clean
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Clean up including files generated by autotools, which should return
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the working directory state to be like it as after a CVS checkout:
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make maintainer-clean
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* Since libdv 0.103, the boostrap file is considered obsolete.
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Autoconf now includes the program autoreconf that can serve the
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same role.
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NTSC Setup/Pedestal
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===================
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This option has been disabled in libdv due to improper usage.
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If you are still curious about this topic, see Adam Wilt's DV FAQ:
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http://www.adamwilt.com/DV-FAQ-tech.html#Setup
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Luma and Chroma Clamping
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========================
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ITU-R 601 specifies that the legal range for luma is 16-235 and
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for chroma is 16-240 regardless of NTSC, PAL, or setup issues. However,
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some users take advantage of the footroom or headroom below or above
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these ranges to encode additional information for things such as
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luma keying. The luma and chroma clamp options permit the range checking
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to be disabled to preserve the superblack and superwhite.
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For more information read Charles' Poyton's Color FAQ:
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http://www.inforamp.net/~poynton/notes/colour_and_gamma/ColorFAQ.html#RTFToC30
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and his white paper "Merging Computing with Studio Video:
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Converting Between R'G'B' and 4:2:2":
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http://home.inforamp.net/~poynton/papers/Discreet_Logic/index.html
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