Recherche avancée

Médias (1)

Mot : - Tags -/biomaping

Autres articles (79)

  • MediaSPIP Core : La Configuration

    9 novembre 2010, par

    MediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes ; une page spécifique à la configuration de la page d’accueil du site ; une page spécifique à la configuration des secteurs ;
    Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques (...)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (5536)

  • How to match precompiled static library's debugging symbols to source code with Xcode 5 ?

    21 septembre 2013, par Chris Ballinger

    I have to compile FFmpeg for iOS using an external build script, but when I am debugging I see assembler if I delve too deep into libavformat library functions :

    0x109a73:  cmpl   $0, 1192(%ebp)
    
0x109a7a:  jns    0x109a86                  ; mov_write_header + 198 at movenc.c:3539
    
0x109a7c:  movl   $1, 1192(%ebp)
    
0x109a86:  movl   16(%ebp), %eax
    
0x109a89:  cmpl   $0, 84(%eax)
    
0x109a8d:  movl   %edx, %ecx
    
0x109a8f:  jne    0x109ad9                  ; mov_write_header + 281 at movenc.c:3548
    
0x109a91:  testb  $2, 48(%ecx)
    
0x109a95:  jne    0x109ac1                  ; mov_write_header + 257 at movenc.c:3541

    There are clear debugging symbols left behind which would lead me to believe that there should be some way to tell Xcode the location of this source code to allow easier debugging.

    Is this even possible ?

    edit : I found a related question here No symbols/source for external library in Xcode 4

    So when I run xcrun dwarfdump libavformat.a | grep "\.c" I get a bunch of results like this :

    AT_decl_file( "libavformat/movenc.c" )

    So I tried putting the relevant source files in folders relative to both the .a file and my .xcodeproj file, but neither of those methods worked. Full source code is available here : https://github.com/openwatch/livestreamer-ios

    edit2 : I found another question about how to set the source mapping for lldb but I'm not quite sure what to do... LLDB equivalent of gdb "directory" command for specifying source search path ?

    It seems like I might need to do

    (lldb) settings set target.source-map libavformat/movenc.c /path/to/libavformat/movenc.c

    for every file I need ?

  • How to decode frames from MDAT atom extracted from mp4 video [closed]

    24 septembre 2024, par Gurinderbeer Singh

    I am new to video codecs and learning video file format specifications. I have read about QUICKTIME file format specifications from here, and MP4 file format (which is almost similar) from here. There are atoms such FTYPE, MOOV, MDAT etc. The MDAT atom contains actual audio and video data. The MOOV atom contains information about how to extract data from MDAT, it gives references to chunks (samples).

    



    I want to extract the video samples in MDAT atom from video file without using any tool such ffmpeg, or juggler etc. I can write my own code for this. The problem is, even if I can locate the video data (samples) in MDAT by using information from MOOV, these samples are compressed. And we need to uncompress these to get frames.
My question is can we uncompress the samples extracted from MDAT and get the actual video frames ?

    



    Tools such as xuggler, ffmpeg etc are used to extract frames from video files. 
But here I want to extract the samples(for video data) from MDAT by writing my own code, but then I want to uncompress those by using some tool. I don't want to write codecs.

    



    Can anyone please help me with this....!

    



    Thanks...

    


  • How to decode frames from MDAT atom extracted from mp4 video

    21 avril 2016, par Gurinderbeer Singh

    I am new to video codecs and learning video file format specifications. I have read about QUICKTIME file format specifications from here, and MP4 file format (which is almost similar) from here. There are atoms such FTYPE, MOOV, MDAT etc. The MDAT atom contains actual audio and video data. The MOOV atom contains information about how to extract data from MDAT, it gives references to chunks (samples).

    I want to extract the video samples in MDAT atom from video file without using any tool such ffmpeg, or juggler etc. I can write my own code for this. The problem is, even if I can locate the video data (samples) in MDAT by using information from MOOV, these samples are compressed. And we need to uncompress these to get frames.
    My question is can we uncompress the samples extracted from MDAT and get the actual video frames ?

    Tools such as xuggler, ffmpeg etc are used to extract frames from video files.
    But here I want to extract the samples(for video data) from MDAT by writing my own code, but then I want to uncompress those by using some tool. I don’t want to write codecs.

    Can anyone please help me with this....!

    Thanks...

Navigation