Provided by: its-playback-time_0.2017-08-30.3c40fd3-1_amd64 bug


       ipbt - play back tty recording files with random access


       ipbt [ options ] file [ file ... ]


       ipbt  is  a  curses-based  playback  utility for recordings of terminal sessions in either
       ttyrec or nh-recorder format.

       ttyrec and nh-recorder are both programs which record the output of  a  terminal  session,
       interspersed  with  timestamps. This allows the session to be replayed on another terminal
       at the original speed, so that the  replaying  terminal  screen  looks  identical  to  the
       original,  provided  the  recording  and  replaying terminals are sufficiently compatible.
       ttyrec and nh-recorder produce differently formatted files,  but  the  principle  is  very

       To  replay  a  tty recording in a forward direction, a program such as ttyplay will simply
       write the contents of  the  file  to  the  output  terminal,  stopping  to  wait  for  the
       appropriate  period  every  time  it encounters a timestamp. Speeding up, slowing down and
       pausing the replay are easy. Rewinding, however, is almost  impossible  with  this  replay

       ipbt solves this by running the entire tty recording through an internal terminal emulator
       and storing the resulting screen contents in a manner that  permits  random  access.  Once
       this  loading  process  is  complete,  ipbt can play forwards and backwards, or jump to an
       arbitrary point in the recording, with equal ease.

       This flexibility comes with two disadvantages:

       ·      ipbt takes noticeable time to load a tty recording in the first place. At the  time
              of  writing  this,  it typically takes a few seconds per megabyte of input. Simpler
              programs such as ttyplay can begin playing instantly.

       ·      Since ipbt does its terminal emulation internally, it can support only one type  of
              terminal,  namely that provided by PuTTY (of which ipbt is a derived work). Any tty
              recording which is not compatible with that terminal type will not come out looking
              right. Simpler programs such as ttyplay rely on the terminal they are running in to
              interpret the terminal control sequences, so  they  can  be  made  to  support  any
              terminal type simply by running them in that type of terminal.

       If either of these is a serious problem, you probably don't want to be using ipbt.


       By  default,  ipbt interprets tty recordings as if they were intended to be replayed on an
       80×24 screen. You can alter this using the following options:

       -w width
              Set the width of the emulated terminal to width columns.

       -h height
              Set the height of the emulated terminal to height rows.

       -u     Set the width and height of the emulated terminal to be the same  as  that  of  the
              real terminal in which you are running ipbt.

       By  default,  ipbt will attempt to analyse the input files and automatically guess whether
       they are in ttyrec or nh-recorder format. On rare occasions this  automatic  guessing  may
       fail:  for example, a ttyrec made on a system whose clock occasionally jumps backwards may
       contain timestamps in non-increasing order, in which case ipbt may consider the  file  not
       to be a valid ttyrec and either try to interpret it as nh-recorder format or (more likely)
       refuse to load it at all. If this happens, you will need to explicitly tell ipbt what type
       of file it is dealing with using the following options:

       -T     Specify  that  all  files  appearing  on the command line after this point (until a
              subsequent format-specifying option) should be assumed to be in ttyrec format.

       -N     Specify that all files appearing on the command line  after  this  point  (until  a
              subsequent format-specifying option) should be assumed to be in nh-recorder format.

       ipbt also provides the following miscellaneous options:

       -f frame
              After loading the tty recordings, jump to the specified frame number. Frame numbers
              are allocated starting from zero, as if all the input files were  concatenated;  so
              if  you  provided  two input files, one with 100 frames and one with 50, then frame
              numbers 0-99 would indicate positions in the first file and frame  numbers  100-149
              would indicate positions in the second.

       -P     After loading the tty recordings, terminate immediately. This option is unlikely to
              be very useful at present, although  it  might  have  specialist  uses  for  people
              wanting to measure ipbt's loading speed or test its automatic format detection.

       -U     Treat the input terminal data as being encoded in UTF-8.

              If  ipbt  has  been compiled against the ncursesw library and is running in a UTF-8
              terminal, it will reproduce the Unicode characters in the input file as  faithfully
              as  it  can. If not, it will at least try to reproduce as many of the characters as
              it can on whatever terminal it does have.


       Once ipbt has loaded a set of tty recordings, it enters a full-screen playing  mode.  This
       section describes the keypresses which control the player.

       To terminate the player, press `q', or Control-C.

       Press  `p'  or  `s'  to  toggle between pause and play mode. The player starts up in pause
       mode, so you may well want to press this immediately to begin playing.

       To go back by one frame, press `b' or `<'. To go  back  by  many  frames,  type  a  number
       followed by `b' or `<'.

       To  go forward by one frame, press the space bar or `>'. To go back by many frames, type a
       number followed by the space bar or `>'.

       To jump to a particular frame number, type the number followed by `g'. Pressing `g' on its
       own will jump to the start of the recording.

       Pressing  capital `G' will jump to the end of the recording. If you type a number followed
       by `G', it will jump to that many frames before the end.

       To play back the recording at higher speed, type a number followed by  `x'.  For  example,
       typing  `3x' will set the player to three times normal speed. (This will not automatically
       bring you out of pause mode; you still need to press `p' or `s' for that.)

       To play back at a lower speed, type a number followed by capital `X';  for  example,  `3X'
       will set the player to one-third normal speed.

       To return to normal speed, you can type `1x' or `1X', or just `x' or `X'.

       If  you  press `l', the player will toggle logarithmic time compression. This is a mode in
       which the delay between frames is scaled in a non-linear fashion: small delays are changed
       very little, but extremely large delays are made significantly less large, so that an hour
       between frames in the original recording becomes only about eight seconds, a  day  becomes
       eleven,  and  even  a  year  between frames would become around seventeen seconds. This is
       helpful if the person who made the recording left the terminal for  a  long  time  in  the
       middle  of  their  session.  Logarithmic  mode can be used in conjunction with the `x'/`X'
       scaling feature.

       If you press `o', the player will show an on-screen display  near  the  top  left  of  the
       screen,  showing  the  current frame number and playback settings. Press `o' again to make
       the display go away.

       You can also search the recording for a frame in which a particular piece of text  appears
       on  the  screen.  Press `/' to search forwards from the current position, or `\' or `?' to
       search backwards. Each of these commands will cause ipbt to prompt for a piece of text  to
       find,  and  will  then search for a frame that contains that text. Press `n' to search for
       the same piece of text again in the same direction.


       ipbt's internal terminal emulation is that of PuTTY, but its display of the resulting data
       is  rather  more  simplistic.  Some  output  features supported by PuTTY are therefore not
       supported by ipbt

       For example, xterm 256-colour mode is not supported at all.

       Also, ipbt's Unicode support does not currently handle various Unicode complications  such
       as characters outside the Basic Multilingual Plane, double-width CJK characters, right-to-
       left scripts, or combining characters.

       (Patches or help from people who know how to persuade ncursesw to do any or all  of  those
       things would be welcome!)


       ipbt  is  free software, distributed under the MIT licence. Type ipbt --licence to see the
       full licence text.