<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=gb2312" http-equiv=Content-Type> <META content="MSHTML 5.00.3502.5390" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=2>Dear all,</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2> I develop gstreamer software ,use gst-ffmpeg-0.8.4 ,running on ARM platform and find a problem.</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>when play mov files , for example,</FONT></DIV> <DIV><FONT size=2> </FONT></DIV> <DIV><FONT size=2>gst-launch filesrc location=/mnt/nfs/dragonballv_default.mp4 ! ffdemux_mov_mp4<BR>_m4a_3gp<BR></DIV></FONT> <DIV> <FONT size=2>will report errors that said read mov header error.</FONT></DIV> <DIV> </DIV> <DIV> </DIV> <DIV><FONT size=2>I traced in source code and find reasons:</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>in gst-libs/ext/ffmpeg/libavformat/utils.c  function av_open_input_stream()</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2> err = ic->iformat->read_header(ic, ap);</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>this line will return error.</FONT></DIV> <DIV> </DIV> <DIV> </DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>In fact ,it calls mov_read_header. </FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>in mov.c </FONT></DIV> <DIV><FONT size=2>function mov_read_header() first call   atom.size = url_filesize(url_fileno(pb));</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>url_filesize will call seek functions in ext/ffmpeg/gstffmpegprotocol.c</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Although the return value is ok and return current file pointer is </FONT><FONT size=2>OK </FONT><FONT size=2>,</FONT></DIV> <DIV><FONT size=2> Next seek, the return data are error :The return data are </FONT><FONT size=2>32kbytes</FONT></DIV> <DIV><FONT size=2>offset from file header ! </FONT></DIV> <DIV><FONT size=2><BR>You know ,in aviobuf.c ,the buffer size is 32k bytes so I doubt it is realtive with the </FONT></DIV> <DIV><FONT size=2>buffer operation. gst_bytestream_seek return new pos are OK ,but the data read from file are error !</FONT></DIV> <DIV><FONT size=2>32k bytes offset !</FONT></DIV> <DIV> </DIV> <DIV> </DIV> <DIV><FONT size=2>But all of these are all OK in X86 system ,only on ARM ,decode mov  I found this error !</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>I debug one week and confused .</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>Please Help me !!!</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Thank you! </FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>Nan Wang</FONT></DIV> <DIV><FONT size=2> </DIV></FONT> <DIV><FONT size=2><BR> </DIV></FONT></BODY></HTML>