Recherche avancée

Médias (91)

Autres articles (59)

  • 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

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • 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 (10023)

  • Join mp4 files in linux [migrated]

    18 décembre 2012, par Jose Armando

    I want to join two mp4 files to create a single one. The video streams are encoded in h264 and the audio in aac. I can not re-encode the videos to another format due to computational reasons. Also, I cannot use any gui programs, all processing must be performed with linux command line utilities. FFmpeg cannot do this for mpeg4 files so instead I used MP4Box

    e.g. MP4Box -add video1.mp4 -cat video2.mp4 newvideo.mp4

    unfortunately the audio gets all mixed up. I thought that the problem was that the audio was in aac so I transcoded it in mp3 and used again MP4Box. In this case the audio is fine for the first half of newvideo.mp4 (corresponding to video1.mp4) but then their is no audio and I cannot navigate in the video also. My next thought was that the audio and video streams had some small discrepancies in their lengths that I should fix. So for each input video I splitted the video and audio streams and then joined them with the -shortest option in ffmpeg.

    thus for the first video I ran

     avconv -y -i video1.mp4 -c copy -map 0:0 videostream1.mp4
    

    
 avconv -y -i video1.mp4 -c copy -map 0:1 audiostream1.m4a
    

    
 avconv -y -i videostream1.mp4 -i audiostream1.m4a  -c copy -shortest  video1_aligned.mp4

    similarly for the second video and then used MP4Box as previously. Unfortunately this didn't work either. The only success I had was when I joined the video streams separetely (i.e. videostream1.mp4 and videostream2.mp4) and the audio streams (i.e. audiostream1.m4a and audiostream2.m4a) and then joined the video and audio in a final file. However, the synchronization is lost for the second half of the video. Concretelly, there is a 1 sec delay of audio and video. Any suggestions are really welcome.

  • Anybody can Explain me, what is Open GOP & Close GOP in Easy way- H.264 ?

    18 mai 2019, par user11281994

    Youtube is Mentioned that, you should have to use Close GOP, Half of the frame rate. Now in my adobe premier pro i added the TMPGEncMovieAVC101212PremPro Plugin. In this plugin, I found GOP setting but i confused how to set close GOP value.

    Also I want to know this is Close GOP structure ?
    IBBPBBPBBPBBPBP

  • Anybody can Explain me, what is Open GOP & Close GOP in Easy way- H.264 ?

    18 mai 2019, par Sunil Sen

    Youtube is Mentioned that, you should have to use Close GOP, Half of the frame rate. Now in my adobe premier pro i added the TMPGEncMovieAVC101212PremPro Plugin. In this plugin, I found GOP setting but i confused how to set close GOP value.

    Also I want to know this is Close GOP structure ?
    IBBPBBPBBPBBPBP

Navigation