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Autres articles (90)

  • Mediabox : ouvrir les images dans l’espace maximal pour l’utilisateur

    8 février 2011, par

    La visualisation des images est restreinte par la largeur accordée par le design du site (dépendant du thème utilisé). Elles sont donc visibles sous un format réduit. Afin de profiter de l’ensemble de la place disponible sur l’écran de l’utilisateur, il est possible d’ajouter une fonctionnalité d’affichage de l’image dans une boite multimedia apparaissant au dessus du reste du contenu.
    Pour ce faire il est nécessaire d’installer le plugin "Mediabox".
    Configuration de la boite multimédia
    Dès (...)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • 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 (...)

Sur d’autres sites (4123)

  • Identifying AVI files with missing index

    29 janvier 2024, par andrixnet

    I am looking for a bash scriptable method to identify AVI files that are missing their index.

    


    These are truncated AVI files that are still playable, albeit with some issues.
Until now the only reliable methods are to open the AVI in VirtualDub (which requests to rederive keyframe flags, and then save with stream copy creates a repaired AVI) or VLC which prompts for creation of an index for seekable playback, but it doesn't save it.

    


    ffmpeg -i bad.avi -codec copy good.avi creates a repaired AVI. And this is scriptable.
But I want to identify only the bad files and feed them to such a repaire script, not waste processing on good files.

    


    I tried something like ffprobe -v error -select_streams v:0 -show_entries stream=index -of default=nw=1 file.avi but it yields "index=0" for both good and bad files. (maybe I misunderstood)

    


    Can such files be identified with ffmpeg and if yes, how ?

    


  • FFMPEG work against LGPL licence [on hold]

    10 mars 2016, par nat

    possible to add libraries to the FFMPEG core library base ?

    Ive been doing the followdfa with no luck :

    Activity t = new Int();

  • H264 NAL unit header - detect type and bring custom videos in this format

    7 décembre 2015, par user3387542

    On a special interface on my device, I can see the NAL units passing by. Two example files shown below :

    P-Frames:
    
00 00 00 01 41 FC 0F 90 86 DE F9 E1 4D 37 AE D3 
    
24 A9 F2 F7 E8 A0 9A 9E B3 FD FE 3A D2 77 3E 79 
    
8C 93 2D 75 61 60 A0 FA BF CB 46 B6 67 A6 C2 81 
    
2B 47 A5 A2 71 5D 4F 90 32 14 EE D5 DE 58 3B 6E 
    
...
    

    
I-Frames / Key-Frames:
    
00 00 00 01 65 B8 20 67 FF FE 1E 8A 00 02 05 BE 
    
4D 49 85 EB FC 9E 44 F7 D0 CE A0 77 25 CD 80 D4 
    
4A A4 E5 66 EE E7 F9 17 E5 81 DC 94 9C 2B 3C DF 
    
DE D2 63 CC 89 98 82 4D AF C6 BF E8 3F 0D 3C BE 
    
...

    My goal is, to be able to overwrite this data in order to inject / play my own video. So fare so good, seems to work but it doesn’t look good yet. While replayed NAL units, which were previously stored from the very same interface look good, an injected video doesn’t. I think i did not get the right video format yet.
    I used different tools like ffmpeg to convert videos into a h264 format. But the video still never looks fine. I think the issue is with the key-frames. While I see lots of 00 00 00 01 41 parts in the converted videos, i can’t find a 00 00 00 01 65.

    What kind of video format is this ? And how to convert my own videos into this format ? By using ffmpeg or other tools.

    Thanks in advance

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