Recherche avancée

Médias (91)

Autres articles (48)

  • 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

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • 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 (8865)

  • FFMPEG resizes processed video

    15 septembre 2021, par Peter Mark Friedladner

    I have this simple code, whcih compresses videos to mp4. Everythign works well but when looking at the final video, it is upscaled higher. Example would be an original video file of 1920 × 1080 turns out to be 4096 × 2160. I do not want this to happen, instead if FFMPEG finds a video of 720x1080,1920x180 etc.. it should keep the original video size, and not alter. Any help would be appreciated.

    


    #find . \( -name "*.mov" -o -name "*.MOV" \);
#do echo $i; done
for i in $(find . -name '*.mov' -or -name '*.MOV'); do 
ffmpeg -i "$i" "${i%.*}.mp4";
rm "$i"
done


    


  • VP9 tiled encoding for view-port dependent 360-degree VR streaming

    28 janvier 2021, par Victor Coyter

    I am trying to use libvpx-vp9 to encode a 360-degree VR video and generate multi-bitrate viewport-dependent playlist, that is :

    


      

    • A video stream could be splitted in to n*m tiles (e.g., 8x8)

      • 


    • Users may fetch those high-resolution tiles which insides their view-port via HTTP webm

      • 


    • and fetch low-resolution tiles which outsides their view-port

      • 


    • Finally, combine the video (without decoding) and render with OpenGL shaders

      • 


    


    Similar ideas like OMAF has been implemented by Intel / fraunhofer hhi, but they were using H.265.

    


    Is that possible to implement in VP9 ?

    


    The tiles in VP9 is designed to accelerate the encoding process by multi-threading, but as per defined in VP9 bitstream specifications, a tile is a "rectangular region of the frame that could be able to be decoded and encoded independently"

    


    I can find that libvpx provide options : --tile-rows and --tile-column and can successfully run them, while they indeed use multi-thread to encode.

    


  • avcodec/cbs : ensure user_data is padded for GBC parsing

    5 octobre 2018, par Aman Gupta
    avcodec/cbs : ensure user_data is padded for GBC parsing

    Fixes crash noticed in the cbs_userdata patchset.
    

    ====ERROR : AddressSanitizer : heap-buffer-overflow on address 0x609000026c89 at pc 0x00010725d37b bp 0x7ffeea04e750 sp 0x7ffeea04e748
    
READ of size 4 at 0x609000026c89 thread T0
    
    #0 0x10725d37a in ff_cbs_read_unsigned get_bits.h:274
    
    #1 0x1072d2767 in ff_cbs_read_a53_user_data cbs_misc_syntax_template.c:119
    
    #2 0x1078251a7 in h264_metadata_filter h264_metadata_bsf.c:595
    
    #3 0x105c1321d in output_packet ffmpeg.c:853
    

    0x609000026c89 is located 1 bytes to the right of 8-byte region [0x609000026c80,0x609000026c88)
    
allocated by thread T0 here :
    
    #0 0x10aef08d7 in wrap_posix_memalign (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x578d7)
    
    #1 0x10aca95e6 in av_malloc mem.c:87
    
    #2 0x10ac545fe in av_buffer_allocz buffer.c:72
    
    #3 0x107263b27 in cbs_h264_read_nal_unit cbs_h264_syntax_template.c:722
    
    #4 0x10725b688 in cbs_read_fragment_content cbs.c:155
    

    Signed-off-by : Aman Gupta <aman@tmm1.net>
    • [DH] libavcodec/cbs_h264_syntax_template.c
    • [DH] libavcodec/cbs_mpeg2_syntax_template.c

Navigation