Recherche avancée

Médias (1)

Mot : - Tags -/Christian Nold

Autres articles (60)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • 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 (9415)

  • Produce waveform video from audio using FFMPEG

    27 avril 2017, par RhythmicDevil

    I am trying to create a waveform video from audio. My goal is to produce a video that looks something like this

    enter image description here

    For my test I have an mp3 that plays a short clipped sound. There are 4 bars of 1/4 notes and 4 bars of 1/8 notes played at 120bpm. I am having some trouble coming up with the right combination of preprocessing and filtering to produce a video that looks like the image. The colors dont have to be exact, I am more concerned with the shape of the beats. I tried a couple of different approaches using showwaves and showspectrum. I cant quite wrap my head around why when using showwaves the beats go past so quickly, but using showspectrum produces a video where I can see each individual beat.

    ShowWaves

    ffmpeg -i beat_test.mp3 -filter_complex "[0:a]showwaves=s=1280x100:mode=cline:rate=25:scale=sqrt,format=yuv420p[v]" -map "[v]" -map 0:a output_wav.mp4

    This link will download the output of that command.

    ShowSpectrum

    ffmpeg -i beat_test.mp3 -filter_complex "[0:a]showspectrum=s=1280x100:mode=combined:color=intensity:saturation=5:slide=1:scale=cbrt,format=yuv420p[v]" -map "[v]" -an -map 0:a output_spec.mp4

    This link will download the output of that command.

    I posted the simple examples because I didn’t want to confuse the issue by adding all the variations I have tried.

    In practice I suppose I can get away with the output from showspectrum but I’d like to understand where/how I am thinking about this incorrectly. Thanks for any advice.

    Here is a link to the source audio file.

  • Produce waveform video from audio using FFMPEG

    30 novembre 2020, par RhythmicDevil

    I am trying to create a waveform video from audio. My goal is to produce a video that looks something like this

    


    enter image description here

    


    For my test I have an mp3 that plays a short clipped sound. There are 4 bars of 1/4 notes and 4 bars of 1/8 notes played at 120bpm. I am having some trouble coming up with the right combination of preprocessing and filtering to produce a video that looks like the image. The colors dont have to be exact, I am more concerned with the shape of the beats. I tried a couple of different approaches using showwaves and showspectrum. I cant quite wrap my head around why when using showwaves the beats go past so quickly, but using showspectrum produces a video where I can see each individual beat.

    


    ShowWaves

    


    ffmpeg -i beat_test.mp3 -filter_complex "[0:a]showwaves=s=1280x100:mode=cline:rate=25:scale=sqrt,format=yuv420p[v]" -map "[v]" -map 0:a output_wav.mp4


    


    This link will download the output of that command.

    


    ShowSpectrum

    


    ffmpeg -i beat_test.mp3 -filter_complex "[0:a]showspectrum=s=1280x100:mode=combined:color=intensity:saturation=5:slide=1:scale=cbrt,format=yuv420p[v]" -map "[v]" -an -map 0:a output_spec.mp4


    


    This link will download the output of that command.

    


    I posted the simple examples because I didn't want to confuse the issue by adding all the variations I have tried.

    


    In practice I suppose I can get away with the output from showspectrum but I'd like to understand where/how I am thinking about this incorrectly. Thanks for any advice.

    


    Here is a link to the source audio file.

    


  • JPEG image quality problems

    2 mars 2020, par atokzz

    I have two different JPEG images captured by the same source (stream IP Boroscope MJPEG). I analyzed the bytes and the structure and, with my very little experience with image byte structures, I couldn’t tell the difference between the two. So, based on the image that has no defects, what makes JPEG 2 have quality problems ?

    PS. : Both of them has the correct SOI and EOI markers (FFD8 and FFD9)

    JPEG 1 : Image without quality problems download from here to see the bytes

    Image’s preview (do not download from here)

    JPEG 2 : Image with quality problems download from here to see the bytes

    Image’s preview (do not download from here)

    Online hex editor (online hex editor to see the binary of the image)

Navigation