[FFmpeg-user] avio_close() delay in releasing file on Windows/MinGW?

Thomas Worth dev at rarevision.com
Sat May 28 22:34:57 CEST 2011

Using MinGW on Windows 7, I create an output file like this:

char *output_file = "somefile.mov";

AVFormatContext *outputCtx;
avformat_alloc_output_context2(&outputCtx, NULL, NULL, output_file);
AVOutputFormat *fmt = outputCtx->oformat;

blah blah code blah...

if(!(fmt->flags & AVFMT_NOFILE)){
if(avio_open(&outputCtx->pb, output_file, AVIO_FLAG_WRITE) < 0) {
 return -1;


blah blah more code...


This all works fine. But if I try to open the file immediately after:

FILE *infile;
if(!(infile = fopen(output_file,"rb+"))){
return -1;

This fails 99% of the time, but once in a while it will work! What's going
on here? I am I forgetting to release something?

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