On Wed, Jan 01, 2020 at 08:10:06PM +0100, Marton Balint wrote: > > > On Tue, 31 Dec 2019, Michael Niedermayer wrote: > > >On Tue, Dec 31, 2019 at 12:37:02PM +0100, Nicolas George wrote: > >>Marton Balint (12019-12-28): > >>>v2: simplified example > >>> > >>>Signed-off-by: Marton Balint <c...@passwd.hu> > >>>--- > >>> doc/muxers.texi | 11 +++++++++++ > >>> libavformat/img2enc.c | 13 ++++++++++++- > >>> 2 files changed, 23 insertions(+), 1 deletion(-) > >> > >>image2 is not the only demuxer that opens new streams. I think a generic > >>solution would be preferable. > > > >i also had a slightly ungood feeling about the patch but didnt > >had time to think more about it. a more generic solution like with > >child AVClasses or something would be interresting but as said i didnt > >had time to think about this ... > > It looks like a big can of worms. > > In the AVFMT_NOFILE case there is no IO context, so options can only be > passed using avformat_write_header/avformat_init_output. > > There is no way to determine which options the protocols will use without > actually opening an IO context (protocol options are passed to the url_open > method of each protocol), so we have to store all remaining options passed > to avformat_write_header/avformat_init_output for possible nested IO use. > > In the normal case (non AVFMT_NOFILE) muxers can use nested contexts too, so > avio_open should also store the original options, all of them, because the > nested contexts might use different protocols. This alone is problematic, > because avio_open should return the unrecognized options... > > Also it might make sense to specify different IO options for nested contexts > than main contexts (or different options for some of the nested contexts) > > IMHO being able to specify the nested options separately is a clean > solution, admittedly less user friendly, but I don't see how this can work > automagically without some major redesign.
ok, yes i agree it would need a too major redesign. thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB No great genius has ever existed without some touch of madness. -- Aristotle
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