[Libav-user] Invalid data found when processing input

[francesco at bltitalia.com]

Hi to all
I made a mov file with an ipad-mini with h264 codec.  This is the result
of frobe:

ffprobe.exe -i IMG_4824.MOV
ffprobe version 2.2.5 Copyright (c) 2007-2014 the FFmpeg developers
  built on Mar 23 2015 09:53:33 with gcc 4.8.1 (GCC)
  configuration: --enable-shared --disable-debug --prefix=/mingw --enable-pthrea
ds --enable-gpl --enable-libx264 --enable-libvpx --enable-libvorbis --enable-lib
theora
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.102 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'IMG_4824.MOV':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2016-01-05 21:25:04
    model           : iPad mini
    model-ita       : iPad mini
    encoder         : 6.1.3
    encoder-ita     : 6.1.3
    date            : 2016-01-05T22:25:04+0100
    date-ita        : 2016-01-05T22:25:04+0100
    location        : +44.0498+010.4806+166.899/
    location-ita    : +44.0498+010.4806+166.899/
    make            : Apple
    make-ita        : Apple
  Duration: 00:00:44.33, start: 0.000000, bitrate: 17285 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709)
, 1920x1080, 17201 kb/s, 24.01 fps, 24 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2016-01-05 21:25:04
      handler_name    : Core Media Data Handler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 k
b/s (default)
    Metadata:
      creation_time   : 2016-01-05 21:25:04
      handler_name    : Core Media Data Handler

When I attempt to decode using libavcodec it fails resultin in "Invalid data
found when processing input". The code is quite simple:

pCodec_qt=avcodec_find_decoder(AV_CODEC_ID_H264);
pCodecCtx_qt = avcodec_alloc_context3(pCodec_qt);
pFrame_qt=av_frame_alloc();
errCode = avcodec_open2(pCodecCtx_qt, pCodec_qt,NULL);
av_init_packet(&packet_qt);
packet_qt.size = <size read from table>
packet_qt.data = <buffer with data read>;
fFinished_qt = 1;
errCode = avcodec_decode_video2(pCodecCtx_qt,
pFrame_qt,&fFinished_qt,&packet_qt);

Code starts in a strange fashion: ussually non annex B h264 format starts
with (hex):
00 00 00 01 
while the first chunk size starts with (hex):
00 02 f0 84

any suggestion or idea ?
Regards
Francesco