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Autres articles (58)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
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Sur d’autres sites (9163)

  • How to change colour in WebM video using FFMPEG

    21 septembre 2020, par gowtham kosaraju

    I Have a web video file in this want to change the colour of the video pixels which are in black to blue color. I tried with the below command.

    


    Input video :
https://share.getcloudapp.com/WnuJoLGX

    


    ffmpeg -vcodec libvpx-vp9 -i input.webm -filter_complex "[0:v]format=rgba,lutrgb=r='if(eq(val,0),240,val)':g='if(eq(val,0),111,val)':b='if(eq(val,0),69,val)':a='val'[out]" -vcodec libvpx-vp9 -map "[out]" output.webm


    


    Output video : https://share.getcloudapp.com/geuzn6be

    


    But output video looks stuttering at the edges. Can anyone guide me on how to make video smoother ?

    


  • avformat/mxfdec : Read Mastering Display Colour Volume from MXF

    9 septembre 2020, par Harry Mallon
    avformat/mxfdec : Read Mastering Display Colour Volume from MXF
    

    Described in Annex B SMPTE ST 2067-21:2020

    Signed-off-by : Harry Mallon <harry.mallon@codex.online>

    • [DH] libavformat/mxf.c
    • [DH] libavformat/mxf.h
    • [DH] libavformat/mxfdec.c
    • [DH] libavformat/mxfenc.c
  • Overlay timelapse video on solid background colour using ffmpeg

    13 septembre 2020, par hamchapman

    I've got a load of screenshots of a homepage that are named homescreen000001.png, homescreen000002.png, etc and I'm trying to create a time-lapse video of these images using ffmpeg.

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    I've got it working in general when I run the following :

    &#xA;&#xA;

    ffmpeg -f image2 \&#xA;       -i ~/Desktop/homescreen%06d.png \&#xA;       -r 0.5 \&#xA;       -s 1440x900 \ &#xA;       -b:v 1M \&#xA;       -vcodec libx264 \ &#xA;       -pix_fmt yuv420p \&#xA;       ~/Desktop/timelapse.mp4&#xA;

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    However, it turns out that some of the images have transparent backgrounds so the background is showing up as black on those images.

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    I'd like a white background so I've been trying to set that up using ffmpeg as follows :

    &#xA;&#xA;

    ffmpeg -f image2 \&#xA;       -loop 1 \&#xA;       -i ~/Desktop/whitebg.png \&#xA;       -i ~/Desktop/homescreen%06d.png \&#xA;       -filter_complex overlay \ &#xA;       -r 0.5 \&#xA;       -s 1440x900 \ &#xA;       -b:v 1M \&#xA;       -vcodec libx264 \ &#xA;       -pix_fmt yuv420p \&#xA;       ~/Desktop/timelapse.mp4&#xA;

    &#xA;&#xA;

    Here whitebg.png is 2px x 2px png with a white background, and that's it.

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    This ffmpeg command produces a really tiny (in file size) video that's just a white background.

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    Can anyone explain how I can overlay the images as a time-lapse video over a white background using ffmpeg ?

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