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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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57ce0321c8
Original commit message from CVS:
Added a tarkin encoder/decoder plugin.
I moved the tarking CVS code in here temporarily until they have a
library (hence this plugin is in ext)
test with:
./gst-launch filesrc location=/opt/data/shihad.mpg ! mpegdemux video_00! { queue ! mpeg2dec ! colorspace ! tarkinenc bitrate=3000 ! disksink location=out.ogg }
./gst-launch filesrc location=out.ogg ! tarkindec ! colorspace ! xvideosink
42 lines
1.5 KiB
Text
42 lines
1.5 KiB
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Most important things:
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- the entropy coder, replace static huffman
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- clean up the pnsr tools
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- write docs and do some performance analysis, compare to other codecs
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- think about a multiresolution multidimensional motion flow detection scheme,
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Marco posted a good paper comparing different algorithms to do this
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Open bugs and stuff required to fix them:
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- wavelet xform bug at short rows, see workaround in wavelet_xform.c
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- (4,x) and (x,4) wavelet implementations have a bug which causes round-off
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errors in the two least significand bits
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Wavelet-related TODO's:
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- remove unecessairy copying in inverse xform
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- improve truncation table setup
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- try other approaches to encode coefficients, jack was talking about VQ
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and reuse vorbis code
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- write avitotarkin/quicktimetotarkin/mpegtotarkin/player/recorder
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(a libsndfile/libaudiofile/libao alike video library would be great !)
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- profile
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- add special transform functions for large strides to prevent cache misses
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- mmx/3dnow/sse/altivec
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Other:
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- u and v buffers could get quarter size already at color conversion
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this would speed up the whole algorithm; perhaps this should get
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configurable
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- fast internal 16bitY/U/V->15/16bitRGB for display could make sense
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- the wavelet codec could be used for still image compression too
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(we just have to define a file format with all goodies you can imagine;)
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- to make it perfect someone has to write a good bilevel compressor and
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mask seperation algorithm
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