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• Incompatible Pointer Type Error, sws_scale, ffmpeg

  28 septembre 2011, par James Felix Black

  My code is very straightforward ; it consumes YUV420P data, resizes it, and produces a PNG or JPEG image (OS X Lion, Apple's gcc 4.2.1). It works fine ; I'm using ffmpeg (HEAD, as of mumble days ago), but when running in -pedantic-errors mode (which I like to do from time to time) :

  zc_libav.c:30: error: passing argument 2 of ‘sws_scale’ from incompatible pointer type

  Ouch ! Well, what's my code look like ?

  sws_scale(sws_ctx, 
  
            in_pic->data,
  
            in_pic->linesize, 
  
            0, 
  
            in->y, 
  
            out_pic->data, 
  
            out_pic->linesize); 

  (You can assume for the sake of argument that the in_pic and out_pic AVPicture structures have been properly initialized, as the code works).

  Well, what're the offending data types ?

  from libswscale/swscale.h :

  int sws_scale(struct SwsContext *c, const uint8_t* const srcSlice[], …

  from libavcodec/avcodec.h

  typedef struct AVPicture {
  
    uint8_t *data[4];
  
    int linesize[4];       ///< number of bytes per line
  
  } AVPicture;

  As I noted above, when I change -pedantic-errors to -pedantic, I get the same complaint, but the code compiles and runs correctly. For my own neurotic sanity, is there any way to get the advantages of -pedantic-errors and, you know, compile this code ?

• Ajouter un moyen de voir la configuration de php

  27 septembre 2011

  Il peut être intéressant d’avoir dans la configuration un accès direct aux informations de configuration de PHP pour débugguer un site ...

  Pour ce faire, on va rajouté un onglet de configuration dans la partie "Configuration avancée" qui nous permettra en un coup de click d’avoir cette configuration visible.

  On ajoute donc une page ms_config qui montrera le résultat de

  phpinfo()

  et le tour sera joué.

• Why does FFMPEG reports the wrong duration ?

  20 octobre 2011, par Adrian Lynch

  I have an oldish build of FFMPEG that I can't easily change.

  We use FFMPEG to find the duration of video and sound files. So far it has been working wonderfully.

  Recently on an uploaded file, FFMPEG has reported a 30 second file as being 5 minutes 30 seconds in length.

  Could it be something wrong with the file rather than FFMPEG ?

  If I use FFMPEG to convert to another file, the duration is restored.

  In case it matters, ffmpeg -i 'path to the file' produces :

      FFmpeg version Sherpya-r15618, Copyright (c) 2000-2008 Fabrice Bellard, et al.
        libavutil     49.11. 0 / 49.11. 0
        libavcodec    52. 0. 0 / 52. 0. 0
        libavformat   52.22. 1 / 52.22. 1
        libavdevice   52. 1. 0 / 52. 1. 0
        libswscale     0. 6. 1 /  0. 6. 1
        libpostproc   51. 2. 0 / 51. 2. 0
        built on Oct 14 2008 23:43:47, gcc : 4.2.5 20080919 (prerelease) [Sherpya]
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'H :\path\to\file.mov' :
        Duration : 00:05:35.00, start : 0.000000, bitrate : 1223 kb/s
          Stream #0.0(eng) : Audio : aac, 44100 Hz, stereo, s16
          Stream #0.1(eng) : Video : h264, yuv420p, 720x576, 25.00 tb(r)
      Must supply at least one output file
  

  It's that very command I use to then extract the duration with RegEx.

  Does anyone have a nice application that can do what I'm trying above but get it right 100% of the time ?