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Autres articles (46)

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (5986)

  • avfilter/af_headphone : Remove pointless additions

    28 août 2020, par Andreas Rheinhardt
    avfilter/af_headphone : Remove pointless additions

    buffer_length is a power-of-two and modulo is buffer_length - 1, so that
    
buffer_length & modulo is zero.
    

    Reviewed-by : Paul B Mahol <onemda@gmail.com>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavfilter/af_headphone.c

  • avfilter/vf_vpp_qsv : add scale mode option

    24 février 2021, par Fei Wang
    avfilter/vf_vpp_qsv : add scale mode option

    The option allow user to set diffenent scaling mode from
    
auto/low-power/high-quality.
    

    More details :
    
https://github.com/Intel-Media-SDK/MediaSDK/blob/master/doc/mediasdk-man.md#mfxExtVPPScaling
    

    Signed-off-by : Fei Wang <fei.w.wang@intel.com>
    
Signed-off-by : Linjie Fu <linjie.justin.fu@gmail.com>
    • [DH] libavfilter/vf_vpp_qsv.c

  • libavutil : add an FFT & MDCT implementation

    2 mai 2019, par Lynne
    libavutil : add an FFT & MDCT implementation

    This commit adds a new API to libavutil to allow for arbitrary transformations
    
on various types of data.
    
This is a partly new implementation, with the power of two transforms taken
    
from libavcodec/fft_template, the 5 and 15-point FFT taken from mdct15, while
    
the 3-point FFT was written from scratch.
    
The (i)mdct folding code is taken from mdct15 as well, as the mdct_template
    
code was somewhat old, messy and not easy to separate.
    

    A notable feature of this implementation is that it allows for 3xM and 5xM
    
based transforms, where M is a power of two, e.g. 384, 640, 768, 1280, etc.
    
AC-4 uses 3xM transforms while Siren uses 5xM transforms, so the code will
    
allow for decoding of such streams.
    
A non-exaustive list of supported sizes :
    
4, 8, 12, 16, 20, 24, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240,
    
256, 320, 384, 480, 512, 640, 768, 960, 1024, 1280, 1536, 1920, 2048, 2560...
    

    The API was designed such that it allows for not only 1D transforms but also
    
2D transforms of certain block sizes. This was partly on accident as the stride
    
argument is required for Opus MDCTs, but can be used in the context of a 2D
    
transform as well.
    
Also, various data types would be implemented eventually as well, such as
    
"double" and "int32_t".
    

    Some performance comparisons with libfftw3f (SIMD disabled for both) :
    
120 :
    
  22353 decicycles in     fftwf_execute,     1024 runs,      0 skips
    
  21836 decicycles in compound_fft_15x8,     1024 runs,      0 skips
    

    128 :
    
  22003 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
  23132 decicycles in monolithic_fft_ptwo,   1024 runs,      0 skips
    

    384 :
    
  75939 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
  73973 decicycles in compound_fft_3x128,    1024 runs,      0 skips
    

    640 :
    
 104354 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
 149518 decicycles in compound_fft_5x128,    1024 runs,      0 skips
    

    768 :
    
 109323 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
 164096 decicycles in compound_fft_3x256,    1024 runs,      0 skips
    

    960 :
    
 186210 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
 215256 decicycles in compound_fft_15x64,    1024 runs,      0 skips
    

    1024 :
    
 163464 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
 199686 decicycles in monolithic_fft_ptwo,   1024 runs,      0 skips
    

    With SIMD we should be faster than fftw for 15xM transforms as our fft15 SIMD
    
is around 2x faster than theirs, even if our ptwo SIMD is slightly slower.
    

    The goal is to remove the libavcodec/mdct15 code and deprecate the
    
libavcodec/avfft interface once aarch64 and x86 SIMD code has been ported.
    
New code throughout the project should use this API.
    

    The implementation passes fate when used in Opus, AAC and Vorbis, and the output
    
is identical with ATRAC9 as well.
    • [DH] libavutil/Makefile
    • [DH] libavutil/tx.c
    • [DH] libavutil/tx.h

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