On 1 November 2016 at 02:00, Steven Liu <lingjiujia...@gmail.com> wrote:
> 2016-11-01 3:16 GMT+08:00 Jan Ekstrom <jee...@gmail.com>: > > > On Mon, Oct 31, 2016 at 5:30 PM, Nicolas George <geo...@nsup.org> wrote: > > > Le nonidi 9 brumaire, an CCXXV, Steven Liu a écrit : > > >> I saw ffmpeg have no HDS and DASH demuxer, and all of them's > > format is > > >> use xml, maybe this parser is a very useful parser, what about the > basic > > >> xml :-D > > > > > > The Timed Text Markup Language, a subtitle format used by Youtube and > > > possibly a few others, is based on XML too. > > > > > > I have started working on a simple XML parser, but Michael quickly > found > > > a bug in my attempt to remove the recursiveness in libavfilter, and I > > > consider it to be the highest priority. Therefore, I stopped shortly > > > after implementing the framework API and input buffer handling. > > > > > > > Hi, > > > > As someone who thought about doing some work on formats that require > > an XML parser, while I do appreciate that you are making a "simple" > > XML parser, I am not sure if this is the best way forward. XML and > > thus by continuation libraries that handle XML are indeed > > abominations, but I am definitely not sure if we should be NIH'ing XML > > parsing. For example, namespaces are already utilized in DASH/CENC. > > Maybe we should just pick one XML parsing library that seems to be the > > least bad of all bad alternatives, and then standardize FFmpeg on it? > > Be it libxml2, libexpat or anything else? > > > > Best regards, > > Jan > > > > Hi Jan Ekstrom, > I cannot sure if i misunderstand you, but i think FFmpeg need a basic > XML parser, > because the FFmpeg have the muxer of DASH/HDS and so on but have no > demuxer, and not only FFmpeg have the muxer to the DASH/ HDS and so on. > There have many tools can muxing the format. > So the XML format is not unify , so need a basic XML parser to paring the > simple XML format at first. > of course, use the third part libxml2 or libexpat is a way to parse the > XML, but i think FFmpeg need a parser by itself, not depend on third part > and use --enable-xxxx, --disable-xxxx to decide the DASH/HDS demuxer enable > or not perhaps not a better way. > > > _______________________________________________ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > I think JEEB is right here as well, XML parsing needs to be done by a separate library because of how bad the format is. Mostly all distributions come with some form of XML parsing library already installed so it's not really a dependency which would require the user to install anything additional. Having to use --enable-lib<xml parsing library> is a small price to pay to not have to maintain a buggy and insecure XML parsing code in the repo. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
