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Autres articles (69)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • 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.

Sur d’autres sites (8555)

  • Syncing decoded video using Ffmpeg

    30 juin 2012, par Infiniti Fizz

    I am using Ffmpeg to decode and play video files. I have currently got the video playing and the audio playing at as fast as the CPU can decode and display them. The problem is that I want to play the video and audio in sync using the system clock.

    I've searched around for some help but can't find anything substantial other than dranger's tutorial 05 but I don't really understand what he is doing because my program isn't written in the same way as his.

    I am using mjpeg files and so the pts seems to be retrieved every single time a frame is decoded, I have multiplied the pts by the time_base as dranger does to get the value in seconds but the resolution seems to be only seconds and so I get the value "6" 25 times and then "7" 25 times as the video runs at 25 frames per second.

    Is there not a more accurate value ? Or way to get a more accurate value and if so, how would I go about syncing to this value ? I am using SDL to display the value so can I just use a SDL_Delay() of the value I get ?

    Thanks for your time,

    Infinitifizz

  • FFmpeg per stream metadata change with more audio streams

    22 août 2014, par tomasb

    I’m trying to change audio stream title for a movie which was originally with DTS sound. I have added AC3 version using -map parameter, want to keep both. My problem is that the AC3 audio stream bears DTS stream metadata. I am using FFmpeg 1.2

    Tried :

    ffmpeg -i movie.mkv -c copy \
    
-metadata:s:1 title="AC3 5.1 640 kb/s" -y movie.temp.mkv

    this partially works, but output file contains only 1 of each stream type, i.e. 1 video, 1 audio and 1 subtitle stream. When i try to get all the streams contained in my mkv like this :

    ffmpeg -i movie.mkv -map 0 \
    
-metadata:s:1 title="AC3 5.1 640 kb/s" -y movie.temp.mkv

    i am getting strange output :

    Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:2 -> #0:2 (subrip -> ass)
    
  Stream #0:3 -> #0:3 (dca -> libvorbis)
    
  Stream #0:4 -> #0:4 (ac3 -> libvorbis)
    
  Stream #0:5 -> #0:5 (subrip -> ass)
    
Press [q] to stop, [?] for help
    
[libvorbis @ 0x12e5a40] Queue input is backward in time
    
    Last message repeated 19 times
    
Queue input is backward in time      20kB time=00:00:01.05 bitrate= 156.8kbits/s    
    
[libvorbis @ 0x12e5a40] Queue input is backward in time
    
    Last message repeated 17 times
    
Queue input is backward in time      20kB time=00:00:01.99 bitrate=  83.0kbits/s    
    
[libvorbis @ 0x12e5a40] Queue input is backward in time
    
    Last message repeated 5 times
    
Queue input is backward in time=      20kB time=00:00:02.38 bitrate=  69.5kbits/s    
    
[libvorbis @ 0x12e5a40] Queue input is backward in time
    
    Last message repeated 6 times
    
Queue input is backward in time=      20kB time=00:00:02.87 bitrate=  57.5kbits/s    
    
[libvorbis @ 0x12e5a40] Queue input is backward in time
    
...

    I have found information that FFmpeg’s attributes under linux are inconsistent when manipulating per stream metadata and doesn’t work as expected so I am looking for some alternative way how to proceed. (preferably with ffmpeg)

    Thanks for any help.

  • libavcodec/ppc : Fix HEVC AltiVec routines with —enable-small

    21 juillet 2018, par A. Wilcox
    libavcodec/ppc : Fix HEVC AltiVec routines with —enable-small

    GCC requires the argument to vec_splat_u32 to be a literal.  The easiest
    
way to accomplish this is to change 'shift' to be const in scale (as it
    
is in the transform routine above), and convert both routines to be
    
inline.  This way, GCC can coerce the values to literals.
    

    Tested on a 970 (Apple G5) and POWER9 (Talos II) ; passed fate and played
    
a clip of Big Buck Bunny correctly.
    

    Fixes ticket #7048
    

    Signed-off-by : A. Wilcox <AWilcox@Wilcox-Tech.com>
    • [DH] libavcodec/ppc/hevcdsp.c

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