video - DirectShow - what is it? -

-

what microsoft's directshow, , how relate to:

  • codecs?
  • containers?

and exact difference between codecs , containers?

in plain english:

codec piece of algorithm and/or code transform audio or video raw format coded format , back; encoder , decoder.

in case of video, raw format pixels in memory, , in case of audio samples.

containers way write encoded data file on hard drive. or way write encoded data stream internet transmission.


Comments

Post a Comment

Popular posts from this blog

python - Scipy curvefit RuntimeError:Optimal parameters not found: Number of calls to function has reached maxfev = 1000 -

-
Image
i want make logharitmic fit. keep getting runtime error: optimal parameters not found: number of calls function has reached maxfev = 1000 i use following script. can tell me go wrong? use spyder still beginner. import math import matplotlib mpl scipy.optimize import curve_fit import numpy np #data f1=[735.0,696.0,690.0,683.0,680.0,678.0,679.0,675.0,671.0,669.0,668.0,664.0,664.0] t1=[1,90000.0,178200.0,421200.0,505800.0,592200.0,768600.0,1036800.0,1371600.0,1630800.0,1715400.0,2345400.0,2409012.0] f1n=np.array(f1) t1n=np.array(t1) plt.plot(t1,f1,'ro',label="original data") # curvefit def func(t,a,b): return a+b*np.log(t) t=np.linspace(0,3600*24*28,13) popt, pcov = curve_fit(func, t, f1n, maxfev=1000) plt.plot(t, func(t, *popt), label="fitted curve") plt.legend(loc='upper left') plt.show() your original data t1 , f1 . therefore curve_fit should given t1 second argument, not t . popt, pcov = curve_fit(func,...
Read more

java - where to store the user credentials in an enterprise application(EAI)? -

-
Image
background/context we developing event notification service . application @ high level looks below: our developene scope involves widget , ens. " ens " acts central point of collection types of events of interest users. user wants know when these types of events occur registers ens, identifies events in order , matches notifications subscriptions. the user wants subscibe should valid user of intergrated application(db, sap system etc) the sequence of events: now question is: what best pracitces in storing users db, sap etc credentials. edit how should user authenticated? should everytime messages delivered?(as @duffymo mentioned, if use strategy, affect source system) additional info: ens web-services. ens polls sap(and other applications) , problem becoming more complex. in sap there data-level authorization. not users allowed see events/data. if sap has pushed data, along user info has authorized see, no issues @ all. case 1: scheduler init...
Read more

openxml - Programmatically format a date in an excel sheet using Office Open Xml SDK -

-
i'm building excel xlsx spreadsheet using office open xml sdk. can add dates sheet converting them "ao" date representation , setting cell value number. can't, however, figure out how add dd-mm-yy formatting cell. i've seen lot of complicated examples have create stylesheet scratch, add format , reference format, figure there must easier way. i'm creating sheet template, , excel has builtin formats/styles. imo should able load stylesheet excel file i'm using template , apply format. can't figure out how though. if you're creating xlsx scratch can't avoid creating style sheet. minimally need style sheet , cell format element. cell format element can reference built-in date format in case can avoid custom number format, if want date format isn't built-in need number format element too. if you're creating xlsx template xlsx, can reference cell format that's defined, can sensitive since references based on index, sa...
Read more