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Autres articles (45)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

  • 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 (...)

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  • 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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