[gstreamer-bugs] [Bug 310945] New: gst-ffmpeg plugin-"ffdemux_mov_mp4_m4a_3gp" read mov files error on ARM platform

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 http://bugzilla.gnome.org/show_bug.cgi?id=310945
 GStreamer | gst-ffmpeg | Ver: HEAD CVS

           Summary: gst-ffmpeg  plugin-"ffdemux_mov_mp4_m4a_3gp" read mov
                    files error on ARM platform
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: nwang at ihopen.cn
         QAContact: gstreamer-bugs at lists.sourceforge.net
                CC: all-bugs at bugzilla.gnome.org


Dear all,
 
 I develop gstreamer software ,use gst-ffmpeg-0.8.4 ,running on ARM platform 
and find a problem.
 
when play mov files , for example,
 
gst-launch filesrc location=/mnt/nfs/dragonballv_default.mp4 ! ffdemux_mov_mp4
_m4a_3gp

 will report errors that said read mov header error.
 
 I traced in source code and find reasons:
 
in gst-libs/ext/ffmpeg/libavformat/utils.c  function av_open_input_stream()
 
 err = ic->iformat->read_header(ic, ap);
 
this line will return error.
 
 
 In fact ,it calls mov_read_header. 
 
in mov.c 
function mov_read_header() first call   atom.size = url_filesize(url_fileno
(pb));
 
url_filesize will call seek functions in ext/ffmpeg/gstffmpegprotocol.c
 
Although the return value is ok and return current file pointer is OK ,
 Next seek, the return data are error :The return data are 32kbytes
offset from file header ! 

You know ,in aviobuf.c ,the buffer size is 32k bytes so I doubt it is realtive 
with the 
buffer operation. gst_bytestream_seek return new pos are OK ,but the data read 
from file are error !
32k bytes offset !
 
But all of these are all OK in X86 system ,only on ARM ,decode mov format files 
I found this error !

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