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  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
    La documentation de l’utilisation du script d’installation (...)

  • Demande de création d’un canal

    12 mars 2010, par

    En fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
    Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...)

  • La sauvegarde automatique de canaux SPIP

    1er avril 2010, par

    Dans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
    Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...)

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  • ffmpeg Reduce frame rate

    10 juillet 2019, par Chieron

    I am trying to convert h264 vids to h265. Some of the vids are 50fps and seem to have a lot of duplicate frames(100000+). I guess these are 25fps vids and somehow they have every frame duplicated.

    ffmpeg is not dropping the frames it seems and so I guess this is wasting space(although I’d hope very little but it’s probably not optimal).

    I’d like to fix this though.

    is there a way to set the frame rate to 30, say(-r 30) and have ffmpeg correctly keep everything in sync(audio aligned properly) and not have any real issues ? this might require interpolation and all that but I definitely do not want the audio to be off(it’s crucial) and I don’t want the length to change.

    I’m not sure if I can just specify -r 30 and everything will work out, if it even matters(maybe h265 handles these duplicates very efficiently ?), or if I need to specify more ?

    So, in some sense, I’m actually increasing the frame rate(if it is 25fps and I’m going to 30, hence the interpolation).

    I also have a lot of videos that this happened to. Is there any efficient way to go back and recode them if necessary ?

    What are the compression consequences of having these duplicate frames in h265 ? Does it store them very efficiently or am I wasting space ?

    I have a few hundred GB of files and probably a lot have this issue as I didn’t know what was going on and didn’t investigate it but saw the message a lot. I actually thought it was just some meaningless error since it was clear the video was consistent with the other. If 100k duplicate frames would imply a static video but it didn’t occur to me that someone would duplicate every frame(since that would simply waste space). [I tried to search but little exists about this specific issue]

  • remove a subpart from the middle of a video

    22 mars 2020, par OneWorld

    I am trying to remove a middle part from a video from 2 to 3 seconds using FFMPEG. So that the video plays with the start, and the end but without the middle part between 2 to 3 seconds.

    This page helped a little bit
    https://superuser.com/questions/681885/how-can-i-remove-multiple-segments-from-a-video-using-ffmpeg

    My code is as follows :-

    ffmpeg -i input.mp4 -filter_complex "[0:v]trim=start=2:end=3,setpts=PTS-STARTPTS, concat[out1]" - map [out1] output_without_2_to_3_secs.mp4

    However with this code I get the following error message

    Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_concat_2. I’m using a Mac.

    Any suggestions much appreciated

  • Remuxing DIVX to MP4 for iDevices

    16 octobre 2013, par Chris Robinson

    Please note, everything I refer to hereafter is using ffmpeg.

    I have a DIVX video which has an mpeg4 codec (MPEG4 Part 2) and an mp3 audio stream as given by ffmpeg -i file.avi. It's my understanding that I should simply be able to remux into an mp4 container for use with iTunes and iDevices by

    ffmpeg -i file.avi -vcodec copy -acodec copy output.mp4

    seeing as both codecs are complient with the Mpeg4 Part 14 specification. However I can't import these files into iTunes. I'm assuming this is because the FourCC of the original stream has been set to DIVX.

    Is there an easy way to change this without re-encoding the video stream ? I'm looking to remux rather than re-encode to keep losses to a minimum and because I have a massive library of DIVX files that I want to import into iTunes and ffmpeg is easily scriptable for addition of future files.

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