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  • Les notifications de la ferme

    1er décembre 2010, par

    Afin d’assurer une gestion correcte de la ferme, il est nécessaire de notifier plusieurs choses lors d’actions spécifiques à la fois à l’utilisateur mais également à l’ensemble des administrateurs de la ferme.
    Les notifications de changement de statut
    Lors d’un changement de statut d’une instance, l’ensemble des administrateurs de la ferme doivent être notifiés de cette modification ainsi que l’utilisateur administrateur de l’instance.
    À la demande d’un canal
    Passage au statut "publie"
    Passage au (...)

  • 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 (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

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  • Fix motion blur in still frames from mpeg2video

    14 mars 2017, par Bird

    I’m extracting still frames from a video using the basic code :

    ffmpeg -i video.MXF -vf fps=1 output_%04d.png  

    In some videos, this yields images that, when the camera was moving, look much blurrier than when watching the video (see example below). The still frames from when the camera was not moving look sharper (closer to how it looks in video playback).

    The video specs are : mpeg2video, yuv422p, 1280x720 (according to FFprobe).

    Is this inherent within the video coding or structure ? The video looks so nice when in motion, but even when I pause in VLC the frame goes from sharp to blurred.

    Are there any additions to my FFmpeg code that could result in sharper images ? I tried adding a yadif filter, but it made no difference (the video isn’t interlaced anyways).

    Unfortunately I can’t post a video sample online, but below is an example of a sharper image and a blurry image ; both look in focus during video playback and are about a second apart in the video (that’s the same orange sea star on the left side).

    Sharper image
    Blurrier image

  • ffmpeg - Making a Clean WAV file

    24 septembre 2016, par Edward

    I’m looking to batch convert a number of files to audio files using ffmpeg for a game called Star Wars: Jedi Knight: Dark Forces II. The problem I’m having is that ffmpeg seems to be doing something that does so that Jedi Knight can’t play the sound file.

    Jedi Knight accepts plain old PCM WAV files of various ranges, from 5khz to 96khz, 8 and 16 bit, mono and stereo. This sounds plain and simple. Except for that if one were to create a WAV file using MS Sound Recorder, Jedi Knight could not play it. Speculation was that it added something extra to header or something. But it can play a WAV file created by Audacity, GoldWave or ModPlug Tracker to name a few.

    So why not ffmpeg ? Am I using the wrong codec or params ? I took an original sound file from the game and performed the following :

    ffmpeg -i "orig_thrmlpu2.wav" -f wav -acodec pcm_s16le -ar 22050 -ac 1 "ffmpeg_thrmlpu2.wav"

    The ffmpeg version does not play in the game. ffprobe shows that the ffmpeg version has some Metadata which the original doesn’t have. What params should I use to try and get the same WAV format as the original ? Mind you, -ar, -ac and bits aren’t the important parts.

    Here are the files for you to examine : http://www.edwardleuf.org/Games/JK/thrmlpu2.zip

  • FFMPEG : Creating a video, which has the maximum value per pixel of n-input videos

    13 décembre 2017, par LighthouseZGZ

    Imagine a collection of short videos, each one showing a shooting star.

    I would like to get a composite video of all shooting stars. Not in sequence, at the same time. The (x,y) pixel of the nth frame in the output video should have the maximum value for that (x,y) pixel of the same frame in all the videos.

    I know how to do that using images and imagemagick :

    magick *.bmp -evaluate-sequence max output.bmp

    I need something similar for video. Frame by frame.

    Any help would be appreciated. Thanks.

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