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Autres articles (55)

  • Modifier la date de publication

    21 juin 2013, par

    Comment changer la date de publication d’un média ?
    Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
    Administrer > Configuration des masques de formulaires > Sélectionner "Un média"
    Dans la rubrique "Champs à ajouter, cocher "Date de publication "
    Cliquer en bas de la page sur Enregistrer

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (8206)

  • ffmpeg overlay video with semi transparent video

    20 janvier 2018, par endryha

    I am trying to overlay background video with another semi transparent video using ffmpeg.

    Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

    The problem is that I don’t know how to make overlay video semitransparent.

    So far I am using following commands :

    ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
    

    
ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

    I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

    UPDATE #1

    It looks like blend filter is exactly what I need but another issue came out :

    ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
    

    
[Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
    
[Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

    So probably if I can resolve issue with different resolutions I am done with my task.
    Please advice what is the direction to go.

    UPDATE#2

    To solve different resolution problem I decided to crop video and then proceed with blending filter

    ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
    

    
ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
    
-filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

  • multichannel (dolby digital, DTS, ecc.) delay difference on original master

    17 janvier 2017, par esposito

    I have different flac files with 6/8 channels (this is the audio of movie) and I need to mix with ffmpeg part of rear channels with front channels and sometimes viceversa.

    There is no problem do it the operation work with an automate software.

    But I’am sure there is a phase difference beetween front channels and rear channels and I like to add a delay to compensate this difference (when I listen it is clear there is a phase offset and this degrade the result).

    I don’t have an idea about how many milliseconds I need to add to compensate and what channel and if the difference is negative or positive.

    Someone can help me please to understand approximately what are the range of delay for each channel (a table is very useful) ?

    Thank you !!

  • Revision 3044 : Ne pas supprimer la meta ... sinon à quoi bon la tester :p

    10 mars 2010, par kent1 — Log

    Ne pas supprimer la meta ... sinon à quoi bon la tester :p

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