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Autres articles (53)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (7742)

  • Extracting frame out of video based on time in seconds

    20 avril 2024, par Vicky

    I'm developing a web-based video editing tool where users can pause a video and draw circles or lines on it using canvas. When a user pauses the video, I retrieve the current playback time in seconds using the HTML5 video.currentTime property. I then send this time value along with the shape details to the server. On the server-side, we use FFmpeg to extract the specific paused frame from the video. The issue I'm encountering is a frame mismatch between the one displayed in the browser and the one generated in the backend using FFmpeg.

    


    I've experimented with various approaches for this process.

    


    Extracting frame based on time. Example : in this case time is 3.360 second.

    


    


    ffmpeg -i input.mp4 -ss 00:00:03.360 -frames:v 1 frame.jpg

    


    


    Converting time to frame number using the following logic : Math.round(video.currentTime * fps)

    


    


    ffmpeg -i input.mp4 -vf "select=eq(n,101)" -vsync vfr frame.jpg

    


    


    


    ffmpeg -i input .mp4 -vf "select='lt(t,3.360)lt(3.360-t,1/31.019)',setpts=N/(31.019TB)" -vsync 0 frame.jpg

    


    


    The challenge I'm facing is that sometimes the frame I see in the browser at the pause time doesn't match the one generated in the backend using FFmpeg. How can I solve this problem ? If it's an issue with currentTime, are there any other approaches I can try ?

    


  • Revision 513157e093 : Scatter-based scantables. This gains about 0.2% on derf, 0.1% on hd and 0.4% on

    25 mars 2013, par Ronald S. Bultje

    Changed Paths : Modify /configure Modify /vp9/common/vp9_entropy.c Modify /vp9/decoder/vp9_dequantize.c Scatter-based scantables. This gains about 0.2% on derf, 0.1% on hd and 0.4% on stdhd. I can put this under an experimental flag if wanted, just trying to get my patch queue in shape. Change-Id : (...)

  • Splitting multiple videos into shorter based on frame count

    15 décembre 2022, par LEstvs

    I can cut the video based on seconds, for example, I can cut the video from second 0 to second 10 and from second 10 to second 20. But I need to cut the video from frame 0 to frame 250 and from frame 250 to frame 500 because of some error due the counting of second. Does anyone has any idea about this ?

    


    Here is the code I use to cut based on seconds :

    


    required_video_file = "H8.avi"

with open("Z:/temp/Letícia/Videos/teste/times.txt") as f:
    times = f.readlines()

times = [x.strip() for x in times] 

for time in times:
    starttime = int(time.split('-')[0])
    endtime = int(time.split("-")[1])
    ffmpeg_extract_subclip(required_video_file, starttime, endtime, targetname=str(times.index(time)+1)+".avi")


    


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