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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

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  • 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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