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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)

  • How to avoid audio sample 16bit clipping after equalization ?

    28 mai 2013, par testCoder

    I have samples which come from ffmpeg, very often it is 16 bit samples (short type), i have used iir band pass filter with dbGain as described here, after filtering i sometimes got a short type overflow and result of it is some noise when calculated sample value go out from 32767/-32767, Is any way to escape audio pcm sample clipping. May be exists any approaches ?

    I have googled but not found any worked example ?

    UPDATE

    When i cast transfer function calculation result to integer and check overflow then noise still occurs: :

    int result = A1 * ((int) Rx) + A2 * ((int) Rxx) + A3 * ((int) Rxxx)
    
                    - B1 * ((int) Ryy) - B2 * ((int) Ryyy);
    
if (result > 32767)
    
    result = 32767;
    
if (result < -32700)
    
    result = -32700;
    
y = (short) result;

  • avcodec/agm : Fix integer overflow with w/h

    5 avril 2019, par Michael Niedermayer
    avcodec/agm : Fix integer overflow with w/h

    Fixes : negation of -2147483648 cannot be represented in type 'int' ; cast to an unsigned type to negate this value to itself
    
Fixes : 13999/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5644405991538688
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Reviewed-by : Paul B Mahol <onemda@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/agm.c

  • Convert YUV420 to BGR without using videoconvert in GStreamer

    23 septembre 2019, par AnD Max

    I am using GSteamer, and I want to convert I420 to BGR format.
    Pipeline :

    gst-launch-1.0 filesrc location= ./Big_Buck_Bunny_1080_10s_1MB.mp4 ! qtdemux ! h264parse ! avdec_h264 ! fakesink

    I don’t use videoconvert plugin because it takes many CPU workload.
    I saw that avdec_h264 plugins has support BGR format and I tried to chose BGR format but the output always give I420 format ("avdec_h264 ! video/x-raw, format=BGR !").

    I tried to cast it to BGR format in source code (gst-libav/ext/libav/gstavvidec.c\gst_ffmpeg_pixfmt_to_videoformat()) but I got an error in (gst-libav/gst-libs/ext/libav/libavcodec/decode.c), 1606

    for (i = 0; i &lt; num_planes; i++) {
    
            av_assert0(frame->data[i]);
    
        }

    Does my way correct ? Should I modify num_planes in deocode.c ?
    If it’s not a right way, can I convert format by using OpenCV with GStreamer pipeline ?

    If you have any good way, please tell me also.

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