[Ffmpeg-devel] read_header() and AVFMTCTX_NOHEADER

[Allan Hsu]

	Hello all. I've been hacking on the ffmpeg FLV decoder a bit; I'm  
working on getting it so that decoding can start before the entire  
file is available. I've written an onMetaData parser to pull header  
information out of streams that contain the FLV META tag. I'm new to  
ffmpeg development though, so I have a few questions that might have  
simple answers:

1. How much information is required for a read_header implementation  
to *not* set AVFMTCTX_NOHEADER? In my use, I've been able to get away  
with creating empty streams (with no codec information set) and  
setting duration from the information in the metadata headers. Is  
this enough? (It sure doesn't feel like it...)

2. Is it always necessary to call av_find_stream_info() after  
av_open_input_stream()?

	-Allan
--
Allan Hsu <allan at counterpop dot net>
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