Hi, I was the one who made that change. We needed a way to obtain individual stream durations from a Matroska file without reading the entire file. I don't think it adds to the file size greatly (< 50 bytes) compared to the size of video and audio data, hence I didn't hide it under an option. However if u really need it I can add an option.
On Jun 16, 2017 7:21 AM, <21na...@gmail.com> wrote: Le 16/06/2017 à 16:04, wm4 a écrit : > On Fri, 16 Jun 2017 15:43:51 +0200 > 21na...@gmail.com wrote: > > Le 16/06/2017 à 14:25, wm4 a écrit : >> >>> On Fri, 16 Jun 2017 13:51:20 +0200 >>> 21na...@gmail.com wrote: >>> >>> >>>> Le 16/06/2017 à 12:55, wm4 a écrit : >>>> >>>>> On Fri, 16 Jun 2017 02:32:10 +0200 >>>>> 21na...@gmail.com wrote: >>>>> >>>>> >>>>>> Hello, >>>>>> >>>>>> >>>>>> I would like to know why the tag “DURATION” in Matroska files (.mkv) >>>>>> is >>>>>> a necessity? Even mkvmerge lets the choice to use it or not with >>>>>> “--enable-durations”, in addition it is written “Write durations for >>>>>> all >>>>>> blocks. This will increase file size and does not offer any additional >>>>>> value for players at the moment.” (source >>>>>> https://mkvtoolnix.download/doc/mkvmerge.html#d4e535). >>>>>> >>>>>> Possibly linked to >>>>>> http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=3185254 >>>>>> 0d4fba0c4e8a16d0b3ddff08fc98e48fd >>>>>> >>>>> As far as I'm aware, the linked commit does not do the same thing as >>>>> the mkvmerge option you pointed out. >>>>> >>>> Yes that is why I wrote “possibly”, also because this commit is the one >>>> which adds the tag “DURATION” as a necessity, but a necessity that no >>>> software seems to use and it is not even a standard in the Matroska’s >>>> documentation if I am not mistaken. So the fact that it is a necessity >>>> and not a choice is the main problem. >>>> >>> Who says it's a necessity or standard? It's just what mkvmerge does. >>> Since the patch is by google, I assume google has some use for it >>> (there might also be a discussion about it on the ML). >>> >> Sorry for the bad word “necessity”, it is better with “imposed”. Could >> you let the choice to the user like mkvmerge with >> “--disable-track-statistics-tags”? >> > We could add a private option to the ffmpeg matroska muxer to disable > writing this tag, and we could even switch that option off by default > (so the tag isn't written unless the user explicitly requests it). Feel > free to propose a patch. > I do not have the capacity for the moment to write patches for such a software but what you have written is exactly what I would like. I can create a bug report if needed. _______________________________________________ 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
