[Matroska-devel] Duration (EBML: 44 89) in Seg inf part

[Peter Ivanov]

How I could find what is the value of the TimecodeScale? 
I am working on test1.mkv file from download section on matroska.org
With mkvinfo.exe the Duration in Segment Information part is:

Duration: 87.336s(00:01:27.336), but my hex value is 0x47AA9400
In float this is 1202361344.00000 

1202361344.00000 *1000000 = doesn't equal to 87.336

Where is my mistake?







 -------- Оригинално писмо --------

От: Moritz Bunkus moritz at bunkus.org

Относно: Re: [Matroska-devel] Duration (EBML: 44 89) in Seg inf part

До: Discussion about the current and future development of Matroska
  

Изпратено на: Сряда, 2013, Март 6 13:55:59 EET


Hey,



SegmentDuration is an EBML float, not an integer. See

 http://www.matroska.org/technical/specs/index.html  and see

 http://www.matroska.org/technical/specs/rfc/index.html 



So: read it as a four-byte IEEE floating point number (C data type:

"float"), cast into an eight-byte IEEE floating point number (C data

type: "double") in order to avoid overflows, then multiply by

TimecodeScale, and you should get the duration in nanoseconds.



Kind regards,

mosu

_______________________________________________

Matroska-devel mailing list

 Matroska-devel at lists.matroska.org 

 http://lists.matroska.org/cgi-bin/mailman/listinfo/matroska-devel 

Read Matroska-Devel on GMane:  http://dir.gmane.org/gmane.comp.multimedia.matroska.devel 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.matroska.org/pipermail/matroska-devel/attachments/20130306/72df5024/attachment-0001.html>