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Autres articles (104)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Monitoring de fermes de MediaSPIP (et de SPIP tant qu’à faire)

    31 mai 2013, par

    Lorsque l’on gère plusieurs (voir plusieurs dizaines) de MediaSPIP sur la même installation, il peut être très pratique d’obtenir d’un coup d’oeil certaines informations.
    Cet article a pour but de documenter les scripts de monitoring Munin développés avec l’aide d’Infini.
    Ces scripts sont installés automatiquement par le script d’installation automatique si une installation de munin est détectée.
    Description des scripts
    Trois scripts Munin ont été développés :
    1. mediaspip_medias
    Un script de (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

Sur d’autres sites (8397)

  • Create video with correct FPS from video with incorrect FPS and file containing timestamps for each frame using FFMPEG

    4 février 2023, par Bojan

    I have a video file captured from web camera and using OpenCV in python. The nominal FPS of the web cam is 30 FPS, but because of the environment, the actual FPS varies and sometimes can go as low as 24 fps. The recorded video is created using OpenCV's VideoWriter, using MP4V FOURCC and always has FPS value of 30, which makes the video's duration incorrect if the actual FPS was not 30. I have a file which contains the timestamps when each frame from the web cam was read (generated using python's time.time()).

    


    Question :
    
Using FFMPEG (or other software) can I use the timestamps information to create new video file (probably VFR file) and then convert it to CFR file ?

    


    I am not sure what is the correct approach to create video file with correct time base.
Maybe I can split the video's frames and save them as images and then use the timestamps and the images to create VFR video, but I want to see if it is possible to do this in another, more elegant way.

    


    Thanks in advance !

    


  • Video is concatenated but not showing all video after playing First one in ffmpeg

    1er décembre 2017, par Chinmoy

    I am trying to concate three mp4 video using FFMPEG. after executing the ffmpeg commend, when I try to play the final video the one is playing 45 second perfectly and then then make it conflict and stop the video but audio is playing .
    I have check finale video duration It’s duration is 120 second which is total duration of thee input video.
    I am asking to you guys hwo can i play this video with out conflicting.

    Here is my code that I have used for concatenate :

    ffmpeg -i /Users/mukul/Documents/Nugruv/video/testforplay.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/testforplay.ts
    

    
ffmpeg -i /Users/mukul/Documents/Nugruv/video/video3.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/video3.ts
    

    
ffmpeg -i /Users/mukul/Documents/Nugruv/video/video4.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/video4.ts
    

    
ffmpeg -i "concat:/Users/mukul/Documents/Nugruv/video/testforplay.ts|/Users/mukul/Documents/Nugruv/video/video3.ts|/Users/mukul/Documents/Nugruv/video/video4.ts" -c

    copy -bsf:a aac_adtstoasc /Users/mukul/Documents/Nugruv/video/Cam01.mp4
    I am waiting for your help.. :)

  • How can i insert 10 seconds of silent audio(null audio without images or video or black video) into video repeat every 15 seconds with ffmpeg ?

    1er septembre 2018, par Adam Estel

    I have a clip video.mp4 . How can i insert 10 seconds of only silent audio into this clip repeat every 15 seconds until the end of this clip with ffmpeg ?
    I know anullsrc is an audio so i can’t use overlay filter. I research on google for a while but the only option i have is gte(mod(t,15),10)).

    Thank you.

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