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Autres articles (55)

  • 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

  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • 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.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (11667)

  • How I can overlay video onto another video start from 2 second to 4 second ?

    23 janvier 2023, par KoliK

    I need overlay video onto another video start from 2 second to 4 second.

    


    I use ffmpeg for overlaying video onto another video for this command
ffmpeg -i tmp/test_screen_1672755242397.mp4 -vf "movie=tmp/test_camera_1672755249551.mp4, scale=250: -1 [inner]; [in][inner] overlay =10: 10 [out]" completed.mp4
But video test_camera_1672755249551 must be to star from 2 second and end to 4 second. What I need to add in command for result ?

    


  • Cut a video in between key frames without re-encoding the full video using ffpmeg ? [closed]

    13 juillet 2024, par bguiz

    I would like to cut a video at the beginning at any particular timestamp, and it need to be precise, so the nearest key frame is not good enough.

    


    Also, these videos are rather long - an hour or longer - so I would like to avoid re-encoding this altogether if possible, or otherwise only re-encode a minimal fraction of the total duration. Thus, would like to maximise the use of -vcodec copy.

    


    How can I accomplish this using ffmpeg ?

    


    NOTE : See scenario, and my own rough idea for a possible solution below.

    


    


    Scenario :

    


      

    • Original video

        

      • Length of 1:00:00

        • 


      • Has a key frame every 10s

        • 


      


      • 


    • Desired cut :

        

      • From 0:01:35 through till the end

        • 


      


      • 


    • Attempt #1 :

        

      • Using -ss 0:01:35 -i blah.mp4 -vcodec copy, what results is a file where :

        • 


      • audio starts at 0:01:30

        • 


      • video also starts at 0:01:30

        • 


      • this starts both the audio and the video too early

        • 


      


      • 


    • using -i blah.mp4 -ss 0:01:35 -vcodec copy, what results is a file where :

        

      • audio starts at 0:01:35,

        • 


      • but the video is blank/ black for the first 5 seconds,

          

        • until 0:01:40, when the video starts

          • 


        


        • 


      • this starts the audio on time,
but the video starts too late

        • 


      


      • 


    


    


    Rough idea

    


      

    • (1) cut 0:01:30 to 0:01:40

        

      • re-encode this to have new key frames,
including one at the target time of 0:01:35

        • 


      • then cut this to get the 5 seconds from 0:01:35 through 0:01:40

        • 


      


      • 


    • (2) cut 0:01:40 through till the end

        

      • without re-encoding, using -vcodec copy

        • 


      


      • 


    • (3) ffmpeg concat the first short clip (the 5 second one)
with the second long clip

      • 


    


    I know/ can work out the commands for (2) and (3), but am unsure about what commands are needed for (1).

    


  • Auto resize video with ffmpeg based on input video resolution

    12 mai 2018, par Masoud Mohammadi

    I wrote a Bash script to convert all video files in a directory. Some videos are 1280 x 720 resolution, and others are 720 x 1280.

    How can I write a ffmpeg command that converts 1280 x 720 videos to 640 x 360 and 720 x 1280 videos to 360 x 640 ?

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