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Autres articles (34)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

Sur d’autres sites (5710)

  • Restream with FFmpeg [closed]

    30 mars, par boyuna1720

    I have iptv playlist file with inside VODs and Channel links. I want to restream it from my server becouse provider allows only one user to watch. When i am using Nginx with RTMP and FFmpeG i am getting this error. please tell me if anyone can help to fix this issue.

    


    ffmpeg -re -i "http://excel90095.cdn-akm.me:80/23a9a158d8d8/2dd736a985/325973" -c:v copy -c:a aac -f flv "rtmp ://localhost/live/test"

    


    enter image description here

    


  • How to Save an Image (Current Frame) from an RTSP, using FFMPEG ?

    4 mars 2023, par spaceman

    I recently purchased a Security Camera,
    
and it provides an RTSP URL withwhich you can view the video.

    


    So If I run the command VLC rtsp://<ip>/etc</ip> for example,
    &#xA;then I am successfully able to watch the stream from the camera.

    &#xA;

    My question is :
    &#xA;Does FFMPEG provide some command line operation for Saving one Image from an RTSP Stream to disk ?

    &#xA;

    That way I can run this command, and have a .PNG or .JPG file created on disk.

    &#xA;

  • Is there a way to (automatically) detect if the channels of a stereo video/audio are out of phase and canceling each other ?

    8 mars 2024, par Rhenan Bartels

    Background

    &#xA;

    I've encountered an issue while attempting to convert an audio downloaded from a youtube video into a mono .wav format using ffmpeg. Despite using typical conversion commands (code below), the resulting audio is either silent or corrupted, indicating potential stereo channel cancellation.&#xA;I tried to load the audio into Python and calculate phase and cross-correlation, but this step uses a lot of memory, especially for a 6-hour-long audio.

    &#xA;

    Goal

    &#xA;

    I'm seeking a method, preferably using ffmpeg, to detect if stereo channels are canceling each other out due to phase misalignment. Additionally, I aim to automate the process of phase inversion before converting to mono to ensure the integrity of the resulting audio.

    &#xA;

    Question :

    &#xA;

    How can I automatically detect if stereo channels are canceling each other and subsequently invert the phase to ensure successful conversion to mono using ffmpeg ? Any insights, solutions, or alternative approaches would be greatly appreciated.

    &#xA;

    Steps Taken :

    &#xA;

      &#xA;
    1. Downloaded audio from YouTube using yt-dlp.

      2. &#xA;

    2. Attempted audio conversion to mono using ffmpeg, resulting in silent or corrupted output.

      3. &#xA;

    3. Successfully converted audio to mono by manually inverting the phase of one channel prior to conversion.

      4. &#xA;

    &#xA;

    Download audio from youtube

    &#xA;

    yt-dlp -f bestaudio https://www.youtube.com/watch?v=s3QB_rJzH08 -o input.webm&#xA;

    &#xA;

    Audio conversion

    &#xA;

    The resulting file is silent or corrupted

    &#xA;

    ffmpeg -i input.webm  -ac 1 -ar 16000 -c:a pcm_s16le output.wav&#xA;

    &#xA;

    Audio conversion to mono .wav with phase inversion

    &#xA;

    The resulting file has audio

    &#xA;

    ffmpeg -i input.webm -af "aeval=val(0)|-val(1)" -ac 1 -ar 16000 -c:a pcm_s16le output.wav&#xA;

    &#xA;

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