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Autres articles (68)

  • 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 (...)

  • 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

  • Librairies et binaires spécifiques au traitement vidéo et sonore

    31 janvier 2010, par

    Les logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
    Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
    Binaires complémentaires et facultatifs flvtool2 : (...)

Sur d’autres sites (5003)

  • lavc/ffv1 : change FFV1SliceContext.plane into a RefStruct object

    11 juillet 2024, par Anton Khirnov
    lavc/ffv1 : change FFV1SliceContext.plane into a RefStruct object

    Frame threading in the FFV1 decoder works in a very unusual way - the
    
state that needs to be propagated from the previous frame is not decoded
    
pixels(¹), but each slice's entropy coder state after decoding the slice.
    

    For that purpose, the decoder's update_thread_context() callback stores
    
a pointer to the previous frame thread's private data. Then, when
    
decoding each slice, the frame thread uses the standard progress
    
mechanism to wait for the corresponding slice in the previous frame to
    
be completed, then copies the entropy coder state from the
    
previously-stored pointer.
    

    This approach is highly dubious, as update_thread_context() should be
    
the only point where frame-thread contexts come into direct contact.
    
There are no guarantees that the stored pointer will be valid at all, or
    
will contain any particular data after update_thread_context() finishes.
    

    More specifically, this code can break due to the fact that keyframes
    
reset entropy coder state and thus do not need to wait for the previous
    
frame. As an example, consider a decoder process with 2 frame threads -
    
thread 0 with its context 0, and thread 1 with context 1 - decoding a
    
previous frame P, current frame F, followed by a keyframe K. Then
    
consider concurrent execution consistent with the following sequence of
    
events :
    
* thread 0 starts decoding P
    
* thread 0 reads P's slice header, then calls
    
  ff_thread_finish_setup() allowing next frame thread to start
    
* main thread calls update_thread_context() to transfer state from
    
  context 0 to context 1 ; context 1 stores a pointer to context 0's private
    
  data
    
* thread 1 starts decoding F
    
* thread 1 reads F's slice header, then calls
    
  ff_thread_finish_setup() allowing the next frame thread to start
    
  decoding
    
* thread 0 finishes decoding P
    
* thread 0 starts decoding K ; since K is a keyframe, it does not
    
  wait for F and reallocates the arrays holding entropy coder state
    
* thread 0 finishes decoding K
    
* thread 1 reads entropy coder state from its stored pointer to context
    
  0, however it finds state from K rather than from P
    

    This execution is currently prevented by special-casing FFV1 in the
    
generic frame threading code, however that is supremely ugly. It also
    
involves unnecessary copies of the state arrays, when in fact they can
    
only be used by one thread at a time.
    

    This commit addresses these deficiencies by changing the array of
    
PlaneContext (each of which contains the allocated state arrays)
    
embedded in FFV1SliceContext into a RefStruct object. This object can
    
then be propagated across frame threads in standard manner. Since the
    
code structure guarantees only one thread accesses it at a time, no
    
copies are necessary. It is also re-created for keyframes, solving the
    
above issue cleanly.
    

    Special-casing of FFV1 in the generic frame threading code will be
    
removed in a later commit.
    

    (¹) except in the case of a damaged slice, when previous frame's pixels
    
    are used directly
    • [DH] libavcodec/ffv1.c
    • [DH] libavcodec/ffv1.h
    • [DH] libavcodec/ffv1dec.c

  • FFMPEG compiled binaries don't run using MinGW

    9 juin 2015, par Paul Knopf

    I am trying to build windows executables/dlls for Windows XP, and they are not working. They are the correct architecture. They run fine on my Windows 8 device machine.

    I used dependency walker to find missing DLLs, and all were present.

    Here are the compiled executables I am trying to run.

    I ran the windows build script for ffmpeg.

    Here is a dumpbin /headers ffmpeg.exe

    Microsoft (R) COFF/PE Dumper Version 10.00.30319.01
    
Copyright (C) Microsoft Corporation.  All rights reserved.
    

    

    
Dump of file ffmpeg.exe
    

    
PE signature found
    

    
File Type: EXECUTABLE IMAGE
    

    
FILE HEADER VALUES
    
             14C machine (x86)
    
               7 number of sections
    
           51A40 time date stamp Sun Jan 04 15:53:20 1970
    
               0 file pointer to symbol table
    
               0 number of symbols
    
              E0 size of optional header
    
             32F characteristics
    
                   Relocations stripped
    
                   Executable
    
                   Line numbers stripped
    
                   Symbols stripped
    
                   Application can handle large (>2GB) addresses
    
                   32 bit word machine
    
                   Debug information stripped
    

    
OPTIONAL HEADER VALUES
    
             10B magic # (PE32)
    
            2.25 linker version
    
           41400 size of code
    
           4FA00 size of initialized data
    
            1200 size of uninitialized data
    
            14E0 entry point (004014E0)
    
            1000 base of code
    
           43000 base of data
    
          400000 image base (00400000 to 00456FFF)
    
            1000 section alignment
    
             200 file alignment
    
            4.00 operating system version
    
            1.00 image version
    
            4.00 subsystem version
    
               0 Win32 version
    
           57000 size of image
    
             400 size of headers
    
           597A9 checksum
    
               3 subsystem (Windows CUI)
    
             140 DLL characteristics
    
                   Dynamic base
    
                   NX compatible
    
          200000 size of stack reserve
    
            1000 size of stack commit
    
          100000 size of heap reserve
    
            1000 size of heap commit
    
               0 loader flags
    
              10 number of directories
    
               0 [       0] RVA [size] of Export Directory
    
           51000 [    36F0] RVA [size] of Import Directory
    
               0 [       0] RVA [size] of Resource Directory
    
               0 [       0] RVA [size] of Exception Directory
    
               0 [       0] RVA [size] of Certificates Directory
    
               0 [       0] RVA [size] of Base Relocation Directory
    
               0 [       0] RVA [size] of Debug Directory
    
               0 [       0] RVA [size] of Architecture Directory
    
               0 [       0] RVA [size] of Global Pointer Directory
    
           56004 [      18] RVA [size] of Thread Storage Directory
    
               0 [       0] RVA [size] of Load Configuration Directory
    
               0 [       0] RVA [size] of Bound Import Directory
    
           517F0 [     6C4] RVA [size] of Import Address Table Directory
    
               0 [       0] RVA [size] of Delay Import Directory
    
               0 [       0] RVA [size] of COM Descriptor Directory
    
               0 [       0] RVA [size] of Reserved Directory
    

    

    
SECTION HEADER #1
    
   .text name
    
   412BC virtual size
    
    1000 virtual address (00401000 to 004422BB)
    
   41400 size of raw data
    
     400 file pointer to raw data (00000400 to 000417FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
60500060 flags
    
         Code
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Execute Read
    

    
SECTION HEADER #2
    
   .data name
    
     19C virtual size
    
   43000 virtual address (00443000 to 0044319B)
    
     200 size of raw data
    
   41800 file pointer to raw data (00041800 to 000419FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0700040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #3
    
  .rdata name
    
    A7D8 virtual size
    
   44000 virtual address (00444000 to 0044E7D7)
    
    A800 size of raw data
    
   41A00 file pointer to raw data (00041A00 to 0004C1FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
40700040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Only
    

    
SECTION HEADER #4
    
    .bss name
    
    1200 virtual size
    
   4F000 virtual address (0044F000 to 004501FF)
    
       0 size of raw data
    
       0 file pointer to raw data
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0700080 flags
    
         Uninitialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #5
    
  .idata name
    
    36F0 virtual size
    
   51000 virtual address (00451000 to 004546EF)
    
    3800 size of raw data
    
   4C200 file pointer to raw data (0004C200 to 0004F9FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #6
    
    .CRT name
    
      3C virtual size
    
   55000 virtual address (00455000 to 0045503B)
    
     200 size of raw data
    
   4FA00 file pointer to raw data (0004FA00 to 0004FBFF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #7
    
    .tls name
    
      20 virtual size
    
   56000 virtual address (00456000 to 0045601F)
    
     200 size of raw data
    
   4FC00 file pointer to raw data (0004FC00 to 0004FDFF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
  Summary
    

    
        1000 .CRT
    
        2000 .bss
    
        1000 .data
    
        4000 .idata
    
        B000 .rdata
    
       42000 .text
    
        1000 .tls

    When I attempt to run the executable on XP, it just closes. There is no "missing dll" messages, nor anything in the event viewer.

  • FFMPEG compiled binaries don't run on XP using MinGW

    10 juin 2015, par Paul Knopf

    I am trying to build windows executables/dlls for Windows XP, and they are not working. They are the correct architecture. They run fine on my Windows 8 device machine.

    I used dependency walker to find missing DLLs, and all were present.

    Here are the compiled executables I am trying to run.

    I ran the windows build script for ffmpeg.

    Here is a dumpbin /headers ffmpeg.exe

    Microsoft (R) COFF/PE Dumper Version 10.00.30319.01
    
Copyright (C) Microsoft Corporation.  All rights reserved.
    

    

    
Dump of file ffmpeg.exe
    

    
PE signature found
    

    
File Type: EXECUTABLE IMAGE
    

    
FILE HEADER VALUES
    
             14C machine (x86)
    
               7 number of sections
    
           51A40 time date stamp Sun Jan 04 15:53:20 1970
    
               0 file pointer to symbol table
    
               0 number of symbols
    
              E0 size of optional header
    
             32F characteristics
    
                   Relocations stripped
    
                   Executable
    
                   Line numbers stripped
    
                   Symbols stripped
    
                   Application can handle large (>2GB) addresses
    
                   32 bit word machine
    
                   Debug information stripped
    

    
OPTIONAL HEADER VALUES
    
             10B magic # (PE32)
    
            2.25 linker version
    
           41400 size of code
    
           4FA00 size of initialized data
    
            1200 size of uninitialized data
    
            14E0 entry point (004014E0)
    
            1000 base of code
    
           43000 base of data
    
          400000 image base (00400000 to 00456FFF)
    
            1000 section alignment
    
             200 file alignment
    
            4.00 operating system version
    
            1.00 image version
    
            4.00 subsystem version
    
               0 Win32 version
    
           57000 size of image
    
             400 size of headers
    
           597A9 checksum
    
               3 subsystem (Windows CUI)
    
             140 DLL characteristics
    
                   Dynamic base
    
                   NX compatible
    
          200000 size of stack reserve
    
            1000 size of stack commit
    
          100000 size of heap reserve
    
            1000 size of heap commit
    
               0 loader flags
    
              10 number of directories
    
               0 [       0] RVA [size] of Export Directory
    
           51000 [    36F0] RVA [size] of Import Directory
    
               0 [       0] RVA [size] of Resource Directory
    
               0 [       0] RVA [size] of Exception Directory
    
               0 [       0] RVA [size] of Certificates Directory
    
               0 [       0] RVA [size] of Base Relocation Directory
    
               0 [       0] RVA [size] of Debug Directory
    
               0 [       0] RVA [size] of Architecture Directory
    
               0 [       0] RVA [size] of Global Pointer Directory
    
           56004 [      18] RVA [size] of Thread Storage Directory
    
               0 [       0] RVA [size] of Load Configuration Directory
    
               0 [       0] RVA [size] of Bound Import Directory
    
           517F0 [     6C4] RVA [size] of Import Address Table Directory
    
               0 [       0] RVA [size] of Delay Import Directory
    
               0 [       0] RVA [size] of COM Descriptor Directory
    
               0 [       0] RVA [size] of Reserved Directory
    

    

    
SECTION HEADER #1
    
   .text name
    
   412BC virtual size
    
    1000 virtual address (00401000 to 004422BB)
    
   41400 size of raw data
    
     400 file pointer to raw data (00000400 to 000417FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
60500060 flags
    
         Code
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Execute Read
    

    
SECTION HEADER #2
    
   .data name
    
     19C virtual size
    
   43000 virtual address (00443000 to 0044319B)
    
     200 size of raw data
    
   41800 file pointer to raw data (00041800 to 000419FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0700040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #3
    
  .rdata name
    
    A7D8 virtual size
    
   44000 virtual address (00444000 to 0044E7D7)
    
    A800 size of raw data
    
   41A00 file pointer to raw data (00041A00 to 0004C1FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
40700040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Only
    

    
SECTION HEADER #4
    
    .bss name
    
    1200 virtual size
    
   4F000 virtual address (0044F000 to 004501FF)
    
       0 size of raw data
    
       0 file pointer to raw data
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0700080 flags
    
         Uninitialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #5
    
  .idata name
    
    36F0 virtual size
    
   51000 virtual address (00451000 to 004546EF)
    
    3800 size of raw data
    
   4C200 file pointer to raw data (0004C200 to 0004F9FF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #6
    
    .CRT name
    
      3C virtual size
    
   55000 virtual address (00455000 to 0045503B)
    
     200 size of raw data
    
   4FA00 file pointer to raw data (0004FA00 to 0004FBFF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
SECTION HEADER #7
    
    .tls name
    
      20 virtual size
    
   56000 virtual address (00456000 to 0045601F)
    
     200 size of raw data
    
   4FC00 file pointer to raw data (0004FC00 to 0004FDFF)
    
       0 file pointer to relocation table
    
       0 file pointer to line numbers
    
       0 number of relocations
    
       0 number of line numbers
    
C0300040 flags
    
         Initialized Data
    
         RESERVED - UNKNOWN
    
         RESERVED - UNKNOWN
    
         Read Write
    

    
  Summary
    

    
        1000 .CRT
    
        2000 .bss
    
        1000 .data
    
        4000 .idata
    
        B000 .rdata
    
       42000 .text
    
        1000 .tls

    When I attempt to run the executable on XP, it just closes. There is no "missing dll" messages, nor anything in the event viewer.

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