Recherche avancée

Médias (39)

Mot : - Tags -/audio

Autres articles (35)

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

Sur d’autres sites (8456)

  • How to flatten a VR video to display in normal screen ? [closed]

    14 mai 2023, par d-b

    I am not sure about the terminology here, but I have a VR-video that is intended to be shown using a headset with separate screens for each eye. It is not 3D in the sense that when you turn your head you will see something different, it is just "2,5D" so you get a sense of depth when looking at it. There are two video channels that are more or less identical, they are just recorded with slightly different angle, similar to how human eyes see the world. I hope this makes it clear what type of video I have, otherwise please ask for clarification in a comment (and if there is a special terminology for this type of video, please let me know).

    


    More details : the original video is 4320x2160, basically 2 square channels at 2160 x 2160.

    


    I want to show this video undistorted on a regular screen.

    


    I have read the following questions here on SO :

    


      


    1. How to reproject and join these two clips with ffmpeg ?

      


      2. 


    2. Flatten 360 fisheye video

      


      3. 


    3. How to de-warp 180 degree or 360 degree fisheye video with ffmpeg ?

      


      4. 


    4. Flatten 360 fisheye video

      


      5. 


    5. Unwarping 180 VR Footage with FFmpeg v360 Filter

      


      6. 


    


    (and problably a few more).

    


    I think I want to extract the two video channels (note that they are in the same video stream, not like in a movie where you can have several separate audio streams for different languages) into separate files and then "undistort" them.

    


    (3) gave me a command to splitting the video into two files :

    


    ffmpeg -i -myclip.mp4 -filter_complex "[0]crop=iw/2:ih:0:0[left];[0]crop=iw/2:ih:ow:0[right]" -map "[left]" -map 0:a /tmp/left.mp4 -map "[right]" -map 0:a /tmp/right.mp4


    


    That seemed to have worked as expected but then I also need to "undistort" the content because it was filmed with some fisheye lens or something like that (straight lines not in the absolute centre of the image are more or less circular).

    


    (5) suggested this command :

    


    ffmpeg -i left.mp4 -vf "v360=input=hequirect:output=flat:h_fov=100:v_fov=67.5:w=1280:h=720" leftfixed.mp4


    


    but that produced an output that was 4320x2160 (obviously only from one channel, since input was just one channel) but just the centre of the original image, I estimate the content to be the 500x250 px (upscaled to 4320x2160, so very blocky) of the midpoint of the original image.

    


    How can I "undistort" this video so it looks good on a 2D-screen while the size is preserved ?

    


  • Révision 20018 : Quand le logo n’est pas editable, et qu’il n’y a ni logo normal ni logo survol d...

    20 novembre 2012, par cedric -

  • vsrc_movie : do not free avoption variables in uninit()

    20 juin 2013, par Anton Khirnov
    vsrc_movie : do not free avoption variables in uninit()

    The generic code frees them as well. Since av_free was used to free them
    
instead of av_freep, this would result in a double free.
    • [DBH] libavfilter/vsrc_movie.c

Navigation