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asciinema-scene

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asciinema-scene provides the sciine command line toolkit for editing screen casts produced by asciinema.

sciine takes as input the content of a screencast, apply a unitary transformation and returns the transformed content.

Installation

Installation from Pypi (recommended):

pip install asciinema-scene

Installation from sources:

uv sync

After installation from sources, you can check everything is working

uv run pytest

Usage

Commandes

There are 4 types of commands:

Usage: sciine [OPTIONS] COMMAND [ARGS]...

Options:
  --version  Show the version and exit.
  --help     Show this message and exit.

Commands:
  copy          Copy content between START and END timecodes.
  cut           Cut content between START and END timecodes.
  delete        Delete the frame with timecode >= TIMECODE.
  header        Print the header field of the content.
  include       Include the content of a .cast file at the timecode...
  insert        Insert a frame at the TIMECODE position.
  maximum       Set maximum duration of each frame.
  minimum       Set minimum duration of each frame.
  quantize      Set the duration of frames in duration range to DURATION.
  replace       Replace the text of frame with timecode >= TIMECODE by TEXT.
  show          Print detail of frames, from START to END (max LINES).
  speed         Change the speed of the screen cast.
  status        Print informations about the content (duration, ...).
  text-delete   Delete frames matching the text regex between START and END.
  text-merge    Merge successive frames matching the regex between START...
  text-replace  Replace text in frames matching the regex between START...

Input / output

By default, sciine reads content from standard input and returns the result to standard output. The --input and --output options allow reading/writing from files (sciine can also read from a compressed .zip or .gz file). sciine does not modify the input file.

-i, --input PATH   Input .cast file, default is stdin.
-o, --output PATH  Output .cast file, default is stdout.

Example:

Speed up a screencast and play a sub-part of it, using pipe redirection.

sciine speed 2.0 --input short.cast | sciine copy --start 1.4 --end 2.4| asciinema play -

Command status

Usage: sciine status [OPTIONS]

  Print informations about the content (duration, ...).

Options:
  -i, --input PATH  Input .cast file, default is stdin.
  --help            Show this message and exit.

Example:

Use status to see the number of frames and the duration of the screecast.

sciine status --input short.cast
Input: short.cast
Date: 2023-05-28 11:15:06+00:00
Frames: 22
Duration: 6.135993

Command header

Usage: sciine header [OPTIONS]

  Print the header field of the content.

Options:
  -i, --input PATH  Input .cast file, default is stdin.
  --help            Show this message and exit.

Example:

Display the original header.

sciine header -i short.cast
{'env': {'SHELL': '/bin/bash', 'TERM': 'linux'},
 'height': 36,
 'timestamp': 1685272506,
 'version': 2,
 'width': 133}

Command show

Usage: sciine show [OPTIONS]

  Print detail of frames, from START to END (max LINES).

  Each line prints the timecode, duration and text of the frame. If no START
  timecode is provided, start from the beginning. If no END timecode is
  provided, display all lines until the end, or LINES lines

Options:
  -s, --start FLOAT    Start timecode (sec), default is 0.0.
  -e, --end FLOAT      End timecode (sec), default is EOF.
  -l, --lines INTEGER  Number of lines to show.
  -p, --precise        Show all digits of time codes.
  -t, --text           Show message field as plain text.
  -i, --input PATH     Input .cast file, default is stdin.
  --help               Show this message and exit.

Example:

Display the first 5 lines and the precise duration of the frames.

sciine show --lines 5 --precise  -i short.cast
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '

Command copy

Usage: sciine copy [OPTIONS]

  Copy content between START and END timecodes.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Play content between 0.05 and 1.2 seconds.

sciine copy --start 0.05 --end 1.2 -i short.cast | asciinema play -

Command cut

Usage: sciine cut [OPTIONS]

  Cut content between START and END timecodes.

  If no START timecode is provided, cut from the beginning. If no END timecode
  is provided, cut until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -a, --adjust       Adjust durations of frames at precise cut values.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Cut end of content after 1.2 seconds.

sciine cut --start 1.2 < short.cast | asciinema play -

Command speed

Usage: sciine speed [OPTIONS] SPEED

  Change the speed of the screen cast.

  SPEED is the factor of acceleration. Use number below 1.0 to to slow down.
  If no START timecode is provided, modify speed from the beginning. If no END
  timecode is provided, modify speed until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Doubles the speed and displays the new duration.

sciine speed 2.0 -i short.cast|sciine status
Input: sys.stdin
Date: 2023-06-03 11:10:23+00:00
Frames: 22
Duration: 3.067996

Command minimum

Usage: sciine minimum [OPTIONS] DURATION

  Set minimum duration of each frame.

  The minimum duration of frames will be set to DURATION seconds, the
  timecodes will be adjusted accordingly. If no START timecode is provided,
  apply from the beginning. If no END timecode is provided, apply until the
  end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Set the frame duration to a minimum of 0.2s and display the new durations.

sciine minimum 0.2 -i short.cast | sciine show -l 5 -p
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.200000│ 'c'
  1.094038│ 0.200000│ 'h'
  1.294038│ 0.300601│ 'o'
  1.594639│ 0.392259│ ' '

Command maximum

Usage: sciine maximum [OPTIONS] DURATION

  Set maximum duration of each frame.

  The duration of frames will be limited to DURATION seconds, the timecodes
  will be adjusted accordingly. If no START timecode is provided, apply from
  the beginning. If no END timecode is provided, apply until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Set the frame duration to a maximum of 0.2s and display the new durations.

sciine maximum 0.2 -i short.cast | sciine show -l 5 -p
  0.000000│ 0.200000│ 'e'
  0.200000│ 0.104510│ 'c'
  0.304510│ 0.164761│ 'h'
  0.469271│ 0.200000│ 'o'
  0.669271│ 0.200000│ ' '

Command quantize

Usage: sciine quantize [OPTIONS] RANGE_MIN RANGE_MAX DURATION

  Set the duration of frames in duration range to DURATION.

  Set the duration of frames to DURATION if their current duration is between
  RANGE_MIN and RANGE_MAX. If no START timecode is provided, apply from the
  beginning. If no END timecode is provided, apply until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Set the frame duration to 0.2s for all frames lasting between 0.1 and 0.4s.

sciine quantize 0.1 0.4 0.2 -i short.cast | sciine show -l 5 -p
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.200000│ 'c'
  1.094038│ 0.200000│ 'h'
  1.294038│ 0.200000│ 'o'
  1.494038│ 0.200000│ ' '

Command include

Usage: sciine include [OPTIONS] TIMECODE INCLUDE_FILE

  Include the content of a .cast file at the timecode position.

  All frames of the INCLUDE_FILE .cast file will be copied in the current
  screen cast. The timecodes will be adjusted as required.

Options:
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Add the content of long.cast to the beginning of the screencast, and display the final duration.

sciine include 0.0 long.cast.gz  -i short.cast|sciine status
Input: sys.stdin
Date: 2023-06-03 12:14:22+00:00
Frames: 71391
Duration: 22.925312

Command insert

Usage: sciine insert [OPTIONS] TIMECODE DURATION TEXT [ETYPE]

  Insert a frame at the TIMECODE position.

  The frame will display TEXT during DURATION seconds. By default the event
  type ETYPE is set to "o".

Options:
  -b, --line-break   Add line break at end of text.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Insert the string 'xyz' at position 2.0 for a duration of 0.1s. View content before and after the change.

sciine show -l 8 -p -i short.cast
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.150277│ 'a'
  2.363413│ 0.511288│ ' '

sciine insert 2.0 0.1 "xyz" -i short.cast | sciine show -l 8 -p
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.100000│ 'xyz'
  2.313136│ 0.150277│ 'a'

Command replace

Usage: sciine replace [OPTIONS] TIMECODE TEXT

  Replace the text of frame with timecode >= TIMECODE by TEXT.

Options:
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Replace the string 'xyz' at position 2.0 for a duration of 0.1s. View content before and after the change.

sciine show -l 8 -p -i short.cast
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.150277│ 'a'
  2.363413│ 0.511288│ ' '

sciine replace 2.0 "xyz" -i short.cast | sciine show -l 8 -p
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.150277│ 'xyz'
  2.363413│ 0.511288│ ' '

Command delete

Usage: sciine delete [OPTIONS] TIMECODE

  Delete the frame with timecode >= TIMECODE.

Options:
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Delete the frame at position 2.0. View content before and after the change.

sciine show -l 8 -p -i short.cast
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.150277│ 'a'
  2.363413│ 0.511288│ ' '

sciine delete 2.0  -i short.cast | sciine show -l 8 -p
  0.000000│ 0.894038│ 'e'
  0.894038│ 0.104510│ 'c'
  0.998548│ 0.164761│ 'h'
  1.163309│ 0.300601│ 'o'
  1.463910│ 0.392259│ ' '
  1.856169│ 0.356967│ '"'
  2.213136│ 0.511288│ ' '
  2.724424│ 0.237965│ 's'

Command text-delete

Usage: sciine text-delete [OPTIONS] TEXT

  Delete frames matching the text regex between START and END.

  If no START timecode is provided, delete from the beginning. If no END
  timecode is provided, delete until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Delete the frames from 3.0 seconds that match '{server}'. View content before and after the change.

sciine show -s3 -i back.cast
  3.057│ 0.20│ '\x1b[K    \\ {server}\r'
  3.258│ 0.21│ '\x1b[K    | {server}\r'
  3.463│ 0.21│ '\x1b[K    / {server}\r'
  3.668│ 0.20│ '\x1b[K    - {server}\r'
  3.871│ 0.20│ '\x1b[K    \\ {server}\r'
  4.073│ 0.20│ '\x1b[K    | {server}\r'
  4.275│ 0.21│ '\x1b[K    / {server}\r'
  4.480│ 0.20│ '\x1b[K    - {server}\r'
  4.682│ 0.18│ '\x1b[K    \\ {server}\r'
  4.861│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

sciine text-delete -s3 -i back.cast '.*{server}' | sciine show -s3
  3.057│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

Command text-replace

Usage: sciine text-replace [OPTIONS] TEXT REPLACEMENT

  Replace text in frames matching the regex between START and END.

  If no START timecode is provided, replace from the beginning. If no END
  timecode is provided, replace until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Replace in the frames from 3.0 seconds '. {server}' by 'box '. View content before and after the change.

sciine show -s3 -i back.cast
  3.057│ 0.20│ '\x1b[K    \\ {server}\r'
  3.258│ 0.21│ '\x1b[K    | {server}\r'
  3.463│ 0.21│ '\x1b[K    / {server}\r'
  3.668│ 0.20│ '\x1b[K    - {server}\r'
  3.871│ 0.20│ '\x1b[K    \\ {server}\r'
  4.073│ 0.20│ '\x1b[K    | {server}\r'
  4.275│ 0.21│ '\x1b[K    / {server}\r'
  4.480│ 0.20│ '\x1b[K    - {server}\r'
  4.682│ 0.18│ '\x1b[K    \\ {server}\r'
  4.861│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

sciine text-replace -s3 -i back.cast '. {server}' 'box' | sciine show -s3
  3.057│ 0.20│ '\x1b[K    box\r'
  3.258│ 0.21│ '\x1b[K    box\r'
  3.463│ 0.21│ '\x1b[K    box\r'
  3.668│ 0.20│ '\x1b[K    box\r'
  3.871│ 0.20│ '\x1b[K    box\r'
  4.073│ 0.20│ '\x1b[K    box\r'
  4.275│ 0.21│ '\x1b[K    box\r'
  4.480│ 0.20│ '\x1b[K    box\r'
  4.682│ 0.18│ '\x1b[K    box\r'
  4.861│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

Command text-merge

Usage: sciine text-merge [OPTIONS] TEXT

  Merge successive frames matching the regex between START and END.

  If no START timecode is provided, merge from the beginning. If no END
  timecode is provided, merge until the end.

Options:
  -s, --start FLOAT  Start timecode (sec), default is 0.0.
  -e, --end FLOAT    End timecode (sec), default is EOF.
  -i, --input PATH   Input .cast file, default is stdin.
  -o, --output PATH  Output .cast file, default is stdout.
  --help             Show this message and exit.

Example:

Merge frames from 3.0 seconds matching '. {server}', keeping total duration. View content before and after the change.

sciine show -s3 -i back.cast
  3.057│ 0.20│ '\x1b[K    \\ {server}\r'
  3.258│ 0.21│ '\x1b[K    | {server}\r'
  3.463│ 0.21│ '\x1b[K    / {server}\r'
  3.668│ 0.20│ '\x1b[K    - {server}\r'
  3.871│ 0.20│ '\x1b[K    \\ {server}\r'
  4.073│ 0.20│ '\x1b[K    | {server}\r'
  4.275│ 0.21│ '\x1b[K    / {server}\r'
  4.480│ 0.20│ '\x1b[K    - {server}\r'
  4.682│ 0.18│ '\x1b[K    \\ {server}\r'
  4.861│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

sciine text-merge -s3 -i back.cast '. {server}' | sciine show -s3
  3.057│ 1.80│ '\x1b[K    \\ {server}\r'
  4.861│ 0.00│ '\x1b[K    \x1b[0m[\x1b[1mserver\x1b[0m] \x1b[32mSuccess\x1b[0m\r\n'

Code source

Github repository: https://github.com/jdum/asciinema-scene

License

This project is licensed under the MIT License (see the LICENSE file for details).

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Toolbox to edit asciinema screencasts (sciine).

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Releases 10

v1.2.2 Latest
Oct 11, 2025
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