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  • Les formats acceptés

    28 January 2010, by

    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 (...)

  • Supporting all media types

    13 April 2011, by

    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 (...)

  • Création définitive du canal

    12 March 2010, by

    Lorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
    A la validation, vous recevez un email vous invitant donc à créer votre canal.
    Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
    A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...)

On other websites (4616)

  • How to split a video using black frames as markers in ffmpeg?

    13 December 2019, by gramm

    I want to split a video so that when there are black frames it creates a new file.
    Is there a way to do this in one command in ffmpeg?
    I can for the moment detect black frames using:

    ffmpeg -i myfile -vf blackdetect=d=2:pix_th=0.00 -f rawvideo -y /NUL

  • FFMPEG: Overlaying one video on another one, and making black pixels transparent

    26 July 2016, by Michael A

    I’m trying to use FFMPEG to create a video with one video overlayed on top another.

    I have 2 MP4s. I need to make all BLACK pixels in the overlay video transparent so that I can see the main video underneath it.

    I found two ways to overlay one video on another:

    First, the following positions the overlay in the center, and therefore, hides that portion of the main video beneath it:

        ffmpeg -i 1.mp4 -vf "movie=2.mp4 [a]; [in][a] overlay=352:0 [b]" combined.mp4 -y

    And, this one, places the overlay video on the left, but it’s opacity is set to 50% so at least other one beneath it is visible:

    ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS[top]; [1:v]setpts=PTS-STARTPTS, format=yuva420p,colorchannelmixer=aa=0.5[bottom]; [top][bottom]overlay=shortest=0" -acodec libvo_aacenc -vcodec libx264 out.mp4 -y

    My goal is simply to make all black pixels in the overlay (2.mp4) completely transparent. How can this be done.

  • Why do I get a black box when I tile pictures with -filter_complex tile=2x1 in FFmpeg?

    19 June 2016, by Mateusz Piotrowski

    As I was trying to write a script (which attempts to join two pictures eventually) using FFmpeg I came across a very weird behaviour.

    I’ve found a command in an accepted answer for the very same problem I had (How to join two image into one by ffmpeg?):

    ffmpeg -i a.jpg -i b.jpg -filter_complex scale=120:-1,tile=2x1 output.jpg

    • Input: a.jpg, b.jpg

      a.jpg b.jpg

    • Output: output.jpg

      output.jpg

    What happened to the B cat? Why is it missing from the output image? I couldn’t find any information why tile=2x1 behaves like this.

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