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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

Sur d’autres sites (12459)

  • lavc/vc1dsp : R-V V vc1_unescape_buffer

    12 mai 2024, par Rémi Denis-Courmont
    lavc/vc1dsp : R-V V vc1_unescape_buffer

    Notes :

    - The loop is biased toward no unescaped bytes as that should be most common.

    - The input byte array is slid rather than the (8 times smaller) bit-mask,
    
  as RISC-V V does not provide a bit-mask (or bit-wise) slide instruction.

    - There are two comparisons with 0 per iteration, for the same reason.

    - In case of match, bytes are copied until the first match, and the loop is
    
  restarted after the escape byte. Vector compression (vcompress.vm) could
    
  discard all escape bytes but that is slower if escape bytes are rare.
    

    Further optimisations should be possible, e.g. :

    - processing 2 bytes fewer per iteration to get rid of a 2 slides,

    - taking a short cut if the input vector contains less than 2 zeroes.
    
But this is a good starting point :
    

    T-Head C908 :
    
vc1dsp.vc1_unescape_buffer_c :      12749.5
    
vc1dsp.vc1_unescape_buffer_rvv_i32 : 6009.0
    

    SpacemiT X60 :
    
vc1dsp.vc1_unescape_buffer_c :      11038.0
    
vc1dsp.vc1_unescape_buffer_rvv_i32 : 2061.0
    • [DH] libavcodec/riscv/vc1dsp_init.c
    • [DH] libavcodec/riscv/vc1dsp_rvv.S

  • AWS Chime : Video Merging Java Library

    18 mai 2023, par Swapnil Srivastav

    I am using AWS Chime to record interaction of two or more than two participants, I want to process this and build a final video.

    


    While making final video I want to mask one participant's video with some generic image and everything I want to do using Java.

    


    Is there any library available which can help me to do this ? I'm using Python as of today, ffmpeg library.

    


  • Create VHS Hi-Fi type (20Hz-20kHz) WAV file, from a 48kHz source FFmpeg [closed]

    27 août 2023, par Taymur Roshan

    I've been experimenting with using FFmpeg to convert modern high-quality audio (44.1, 48 & 96kHz etc.)into analogue type audio which are the old fashions Hi-Fi sounds like the 20 kHz frequency sampling signals https://en.wikipedia.org/wiki/VHS#Hi-Fi_audio_system.

    


    But since I already figured out of how to simply convert high frequency (source 48kHz) to low frequently (output 20kHz) using the '-ar' filter :

    


    ffmpeg -i "source.webm" -c:a pcm_s16le -ar 20000 "output.wav"


    


    However what I would like to know is that how can I make a genuine "flat full-range frequency response" 20 Hz to 20 kHz ?

    


    That would mean first downmix to 20kHz and also remove the first 20Hz out of the audio.

    


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