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  • 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 (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Possibilité de déploiement en ferme

    12 avril 2011, par

    MediaSPIP peut être installé comme une ferme, avec un seul "noyau" hébergé sur un serveur dédié et utilisé par une multitude de sites différents.
    Cela permet, par exemple : de pouvoir partager les frais de mise en œuvre entre plusieurs projets / individus ; de pouvoir déployer rapidement une multitude de sites uniques ; d’éviter d’avoir à mettre l’ensemble des créations dans un fourre-tout numérique comme c’est le cas pour les grandes plate-formes tout public disséminées sur le (...)

Sur d’autres sites (4267)

  • How to create a JPEG 2000 sequence with alpha channel with FFmpeg

    7 avril 2021, par florit

    How can I create a JPEG 2000 sequence preserving the alpha of an input video with FFmpeg ?

    


    ffmpeg -i /path/to/movie_with_alpha.mov -c:v jpeg2000 -pix_fmt rgba /output/path/sequence_%04d.jp2


    


    … throws this info :

    


    Incompatible pixel format 'rgba' for codec 'jpeg2000', auto-selecting format 'rgb24'


    


    I tried other options for -pix_fmt with no luck.

    


  • FFMPEG command capturing darker pics from webcam

    19 décembre 2018, par Pratul Yadav

    I am using ffmpeg in linux to capture pics from a webcam.

    Command Used : ffmpeg -y -f video4linux2 -ss 00:00:00.900 -t 1 -s 1280x720 -i /dev/v4l/by-id/usb-HD_Camera_Manufacturer_USB_2.0_Camera-video-index0 -vframes 1 -q:v 2 /tmp/test.jpg

    Query : The strange thing is the pics clicked using this command are darker (good) and brighter (good) alternately.
    Which means, 1st-time pic is darker, 2nd time its brighter, 3rd time its darker again and so on.

    Can anyone let me know why this is happening ? And how can I fix this issue to get all time brighter pics ?

    Please see sample pics.

    Brighter Pic
    enter image description here

    Darker Pic
    enter image description here

  • ffmpeg : concatinating files creates audio artefacts

    28 octobre 2022, par LML

    I'm currently trying to create a video out of multiple short video files. However, the final video always has audio artefacts, where it sounds like a short high pitch or echo at certain times during the audio. All the audio is a text-to-speech generated voice. No music. The artefacts appear sometimes more, sometimes less. But I would obviously prefer to have 0 of it.

    


    My starting point is a long audio file (mono with audio codec "mp3" according to ffprobe). Within that file are a bunch of short pauses of 4-5 seconds. I detect the silences and create individual audio files from there. Afterwards I create an mp4 file with this audio and a still image. Up to this point, the audio is perfectly fine and sounds the exact same as in the original file.

    


    After this I want to create the final video : each of the individual parts added into one long video. There is a transition between each file to mark the changing of image and audio. But even when skipping the transition and simply adding all of these clips that were generated the same way together, the artefacts are still present.

    


    The commands I use to create the different files.

    


    Create individual audio files :
.\ffmpeg.exe -y -hide_banner -i TTSAudio.mp3 -ss 359.944 -to 372.02479 -c copy partXY.mp3

    


    Create individual video files by using a .png file as the video stream and the partXY.mp3 as the audio stream :
.\ffmpeg.exe -y -hide_banner -framerate 30 -loop 1 -i XY_full.png -i partXY.mp3 -c:v libx265 -c:a copy -shortest partXY.mp4

    


    For concatenating the files :
.\ffmpeg.exe -y -hide_banner -i part000.mp4 -i part001.mp4 -i part002.mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" -c:v copy -c:a copy final_video.mp4

    


    I've tried a lot of different things and codecs for the audio, without any luck. I use h265, as using h264 was causing weird video artefacts after uploading the file to YouTube.
I have tried reencoding, instead of copying (-c:a copy) at various stages, especially the final video. All without any luck.
I've used the different concatenation where you provide a list of files, which created a whole different set of problems.

    


    I've managed to filter the artefacts out by using -af "lowpass=f=2800", but that changes the voice a lot. I was also not able to notice the pitch visually when opening the audio in audacity, for example.

    


    Example :
https://soundcloud.com/thelml/sets/ffmpeg-audio-artefacts/s-LNr6UaMPgz9?si=f7b30e1e64bf4333ad055fa1fe21e9ec
Due to the files being so short, I seem to have to sometimes have to replay the bugged file to hear the artefact.

    


    So my question is : how do I fix this, without using a lowpass that basically changes the whole voice ?

    


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