Hi, balus
I think the second parameter of ngx_http_flv_read in ngx_http_flv_read_metadata 
and ngx_http_flv_read_tags is incorrect, it should be NGX_FLV_TAG_HEADER_SIZE.
Besides, 'keyframes' is a non-standard object in metadata, there is no 
description about it in official tech document, you can refer to 
https://www.adobe.com/devnet/f4v.html for details. Therefore, if a FLV file 
without the 'keyframes' object in metadata is played, the member 'times' of 
structure ngx_http_flv_file_t will be NULL, ngx_http_flv_timestamp_to_offset 
will crash then.
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