[Ffmpeg-devel] AVOptions

[Fred Rothganger]

Rich Felker wrote:

>>the idea was that they would be in the same list
>>    
>>
>
>What if a particular container has a key name that overlaps with a
>lavf muxer setting name? IMO something needs to be done to protect the
>namespace, even if they are in the same list. But I question the whole
>same list thing, since some containers allow arbitrary key names, and
>the AVOption list seems to be a fixed list of options..?
>  
>

    I like the idea of separate namespaces, and it seems like the 
easiest way to do this is separate lists.  Maybe there could be a 
function in AV*Format that delivers a pointer to the current string of 
available metadata (and perhaps a second one the delivers a pointer to 
the string of options that the format supports).  One good reason for 
separate name spaces is that it would simplify the task of matching up 
supported metadata keys between two different containers.  You probably 
wouldn't want parameters to get involved in this unless you are trying 
to copy over the quality settings or something like that.

    The key thing to consider here is whether or not to mix the job of 
handling command line options with the job of accessing metadata.  It 
seems to me that they are best separated, although there is some 
elegance in having a single set of keys to access everything.

-- Fred