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Autres articles (55)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
    Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

  • Mise à disposition des fichiers

    14 avril 2011, par

    Par défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
    Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
    Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)

Sur d’autres sites (11014)

  • Revision 6c280c2299 : Adjust style to match Google Coding Style a little more closely. Most of these

    1er novembre 2012, par Ronald S. Bultje

    Changed Paths : Modify /vp8/common/arm/arm_systemdependent.c Modify /vp8/common/debugmodes.c Modify /vp8/common/entropymode.c Modify /vp8/common/entropymode.h Modify /vp8/common/extend.c Modify /vp8/common/extend.h Modify /vp8/common/filter.c (...)

  • mismatching process id from process execution. Why do they not match and how to fix script to get the correct pid ?

    26 février 2013, par buggedcom

    I'm running a script that executes ffmpeg and outputs stout to a temp file. Along side the output from ffmpeg I'm sending two tokens. one a marker for a failed execution. The other for marking when ffmpeg is completed. I'm trying to output the process id back to the executing script (which is php) however the process id being returned is not that of ffmpeg, rather the bash script.

    The script is as below.

    ((/opt/local/bin/ffmpeg -i '/Users/ollie/Sites/@Projects/PHPVideoToolkit/v2/git/examples/media/BigBuckBunny_320x180.mp4' -y -t '20' -strict 'experimental' -s '142x80' -aspect '16:9' -b:v '10000k' '/Users/ollie/Sites/@Projects/PHPVideoToolkit/v2/git/examples/output/test-1361797899.mp4' && echo '') || echo '' '') 2>&1 > '/Users/ollie/Sites/@Projects/PHPVideoToolkit/v2/git/examples/tmp/phpvideotoolkit_GmxT4T' 2>&1 & echo $!

    Example output from the script is as follows :

    [19] 19316

    However querying ps. The process id of ffmpeg is different. For example :

    Olivers-Mac-Pro:~ ollie$ ps
    
  PID TTY           TIME CMD
    
19025 ttys002    0:00.00 -bash
    
19026 ttys002    0:00.00 -bash
    
19316 ttys002    0:00.00 -bash
    
19317 ttys002    0:00.00 -bash
    
19318 ttys002    0:46.56 /opt/local/bin/ffmpeg -i /Users/ollie/Sites/@Projects/PHPVideoToolkit/v2/git/examples/media/BigBuckBunny_320x180.mp4 -y -strict experimental -s 142x80 -aspect 16:9 -b:v 10000k /Users
    
  849 ttys003    0:00.12 -bash
    
 7558 ttys004    0:00.03 -bash

    You see that the process id returned by the script does not match the ffmpeg process id given by ps. Why is this and how can I ammend the original script to get the correct process id ?

  • How can I concatenate MP4 videos and exactly match this combined video to an audio track in ffmpeg ?

    17 juin 2020, par mattador

    Basically I want to combine 4 videos into a single video, then swap out the concatenated audio for another track. The audio track needs to be unaltered and sync exactly to the video.

    



    Specifically, I'm creating multipaged dynamic audio spectrograms (visualizations of a sound file) using ggplot2 and gganimate in R, which I want to combine using ffmpeg. So the original WAV is chopped up into 3 sec segments, a video is created to visualize frequency changes over time for each segment, which I want to combine into 1 video with the original audio track matched up.

    



    All of my relevant files are at github here in the vids folder : DL link here

    



    The individual dynamic spectrograms export fine (1-4.mp4 in the archive). They are each 20ms too long ; they should be exactly 3s, but otherwise great.

    



    I then use ffmpeg to concatenate them :

    



    ffmpeg -f concat -safe 0 -i "mp4Segments.txt" -codec copy -t 12 -y "(1-4)vid.mp4"


    



    but you can see the end of (1-4)vid.mp4 is getting a little off (the cursor is not all the way to the end, so I guess the video is getting cut off before the end. Not a deal-breaker, since the audio still aligns very well to the video cursor.

    



    Now, since the concatenated video introduces glitchy audio between clips, I want to take the uncut original audio and add that to the assembled video.

    



    ffmpeg -ss 0 -i "(1-4)vid.mp4" -i "origWAV.wav"  -c:v libx264 -map 0:v:0 -map 1:a:0 -c:a aac -ac 1 -b:a 192k -y -vsync 1 -t 12 "(1-4)vid+origWAV.mp4"


    



    but the audio is slightly off now, and ends even further before the end of the video. Since it's really important to align audio and video precisely for this, how can I speed up the video to fit the exact duration of the audio or otherwise fix this issue ?

    


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