구차니의 잡동사니 모음

[root@localhost data]# ll

합계 48

-rw-r--r-- 1 root root 39852  8월  3  2017 default-testpage.pdf

-rw-r--r-- 1 root root   845  8월  3  2017 default.pdf

-rw-r--r-- 1 root root   234  8월  3  2017 testprint

[root@localhost data]# file *

default-testpage.pdf: PDF document, version 1.5

default.pdf:          PDF document, version 1.5

testprint:            ASCII text 

[root@localhost data]# cat testprint

#PDF-BANNER

Template default-testpage.pdf

Show printer-name printer-info printer-location printer-make-and-model printer-driver-name printer-driver-version paper-size imageable-area job-id options time-at-creation time-at-processing

$ escputil -P Stylus-C45 -m C45 -u -c 

웹 스트로지 생명주기와 범위

로컬 스토리지와 세션 스토리지는 저장된 데이터의 생명주기와 범위에 차이가 있다. 로컬 스토리지를 통해 저장된 데이터는 만료기한이 없고, 웹 애플리케이션이 삭제되기 전이나 사용자가 브라우저의 특정 인터페이스를 통해 삭제하기전까지는 사용자의 컴퓨터에 존재하므로 영구적으로 저장된다고 할 수 있다.

-o page-bottom=N

-o page-left=N

-o page-right=N

-o page-top=N

Sets the page margins when printing text files. The values are in points - there are 72 points to the inch. 

probesize integer (input)

Set probing size in bytes, i.e. the size of the data to analyze to get stream information. A higher value will enable detecting more information in case it is dispersed into the stream, but will increase latency. Must be an integer not lesser than 32. It is 5000000 by default.

-r[:stream_specifier] fps (input/output,per-stream)

Set frame rate (Hz value, fraction or abbreviation).

As an input option, ignore any timestamps stored in the file and instead generate timestamps assuming constant frame rate fps. This is not the same as the -framerate option used for some input formats like image2 or v4l2 (it used to be the same in older versions of FFmpeg). If in doubt use -framerate instead of the input option -r.

As an output option, duplicate or drop input frames to achieve constant output frame rate fps.

Also setting -probesize and -analyzeduration to low values may help your stream start up more quickly (it uses these to scan for "streams" in certain muxers, like ts, where some can appears "later", and also to estimate the duration, which, for live streams, the latter you don't need anyway). This should be unneeded by dshow input.

Reducing cacheing at the client side can help, too, for instance mplayer has a "-nocache" option, other players may similarly has some type of pre-playback buffering that is occurring. (The reality is mplayers -benchmark option has much more effect). 

ffmpeg -h full | grep 'analyzeduration\|probesize'

-probesize         <int>        .D.... set probing size (from 32 to INT_MAX)

-analyzeduration   <int>        .D.... specify how many microseconds are analyzed to probe the input (from 0 to INT_MAX) 

analyzeduration integer (input)

Specify how many microseconds are analyzed to probe the input. A higher value will enable detecting more accurate information, but will increase latency. It defaults to 5,000,000 microseconds = 5 seconds. 

-probesize 32 -analyzeduration 0