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Autres articles (42)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

  • 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 (7212)

  • FFmpeg overlaying image onto video fadeout than fadein not functioning

    15 août 2020, par Kursat Turkay

    got a video and png image as an overlay.
    
when I fade in at start of video and fade out at the end, the overlay works as expected.
    
but when I try to reverse the fade effect no error throws but output video does not show any overlay.

    


    ffmpeg -i input.mp4 -i overlay.png -filter_complex
"[1:0]format=rgba,fade=t=in:st=0:d=5:alpha=1,fade=t=out:st=95:d=5:alpha=1[my1]
 [0:0][my1]overlay=W-w-100:H-h-100:shortest=1"


    


    code above works as I expected. but what I want is reverse the effects. the code below not throws any error and produces a video. but no overlay shown at start or end or anywhere.

    


    code below what I guess should work. but not.

    


    ffmpeg -i input.mp4 -i overlay.png -filter_complex
"[1:0]format=rgba,fade=t=out:st=0:d=5:alpha=1,fade=t=in:st=95:d=5:alpha=1[my1]
 [0:0][my1]overlay=W-w-100:H-h-100:shortest=1"


    


    any clues ?

    


  • When creating a Xing or Info tag in an MP3, may I use any MP3 header or does it have to match other frames ?

    13 décembre 2019, par Alexis Wilke

    I have a set of bare MP3 files. Bare as in I removed all tags (no ID3, no Xing, no Info) from those files.

    Just before sending one of these files to the client, I want to add an Info tag. All of my files are CBR so we will use an Info tag (no Xing).

    Right now I get the first 4 bytes of the existing MP3 to get the Version (MPEG-1, Layer III), Bitrate, Frequency, Stereo Mode, etc. and thus determine the size of one frame. I create the tag that way, reusing these 4 bytes for the Info tag and determining the size of the frame.

    For those wondering, these 4 bytes may look like this :

    FF FB 78 04

    To me it felt like you are expected to use the exact same first 4 bytes in the Info tag as found in the other audio frames of the MP3, but when using ffmpeg, they stick an Info tag with a hard coded header (wrong bitrate, wrong frequency, etc.)

    My question is : Is ffmpeg really doing it right ? (LAME doesn’t do that) Could I do the same, skipping the load of the first 4 bytes and still have the greater majority of the players out there play my files as expected ?

    Note : since I read these 4 bytes over the network, it would definitely save a lot of time and some bandwidth to not have to load these 4 bytes on a HEAD request. Resources I could use for the GET requests instead...

  • How to see FFmpeg command MovePY uses ?

    16 novembre 2019, par user319862

    I am trying to figure out why moviepy doesn’t output expected results. How can I log the FFmpeg command that it uses so that I can compare ?

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