ターミナルの録画再生共有などができるソフトウェアのasciinemaの3.0がリリースされました．
今回のリリースはrustで書き直され，ファイル形式も新しくなったようです．(asciicast v3 file format)また，ターミナルのウェブによるライブストリーミング機能も付きました．
自分のDebian環境ではパッケージ度導入しているのですが，出たばかりなのでunstableでも2.4.0です．
$ rmadison asciinema asciinema | 2.0.2-2 | oldoldstable | source, all asciinema | 2.2.0-1 | oldstable | source, all asciinema | 2.4.0-1 | stable | source, all asciinema | 2.4.0-1 | testing | source, all asciinema | 2.4.0-1 | unstable | source, all
LinuxではReleasesページにx86_64, aarch64のバイナリが用意されています．
armhfでのビルド
Raspberry Pi OS bookworm armhf環境でビルドを試してみました．
パッケージで導入したRustが古いようです，rust 1.66以降が必要そうです．
$ git clone https://github.com/asciinema/asciinema $ cd asciinema $ cargo build --release : error: package `toml v0.8.23` cannot be built because it requires rustc 1.66 or newer, while the currently active rustc version is 1.63.0 Either upgrade to rustc 1.66 or newer, or use cargo update -p toml@0.8.23 --precise ver where `ver` is the latest version of `toml` supporting rustc 1.63.0
以下のManual installationからarmv7-unknown-linux-gnueabihf版のrustup-initを入手します．
$ wget https://static.rust-lang.org/rustup/dist/armv7-unknown-linux-gnueabihf/rustup-init
https://static.rust-lang.org/rustup/dist/armv7-unknown-linux-gnueabihf/rustup-init.sha256
$ sha256sum --check rustup-init.sha256
./rustup-init: OK
$ chmod u+x ./rustup-initrustup-initコマンドを実行して新しいrustを導入します．
$ ./rustup-init : Continue? (y/N) y 1) Proceed with standard installation (default - just press enter) 2) Customize installation 3) Cancel installation >1 : info: installing component 'rustfmt' info: default toolchain set to 'stable-armv7-unknown-linux-gnueabihf' stable-armv7-unknown-linux-gnueabihf installed - rustc 1.90.0 (1159e78c4 2025-09-14) Rust is installed now. Great! To get started you may need to restart your current shell. This would reload your PATH environment variable to include Cargo's bin directory ($HOME/.cargo/bin). To configure your current shell, you need to source the corresponding env file under $HOME/.cargo. This is usually done by running one of the following (note the leading DOT): . "$HOME/.cargo/env" # For sh/bash/zsh/ash/dash/pdksh source "$HOME/.cargo/env.fish" # For fish source $"($nu.home-path)/.cargo/env.nu" # For nushell
バージョンを確認します．最近リリースされた1.90.0が使えるようになりました．
$ which cargo /usr/bin/cargo $ /usr/bin/cargo -V cargo 1.65.0 $ ~/.cargo/bin/cargo -V warning: `/home/matoken/.cargo/config` is deprecated in favor of `config.toml` note: if you need to support cargo 1.38 or earlier, you can symlink `config` to `config.toml` cargo 1.90.0 (840b83a10 2025-07-30)
rust 1.90.0を使って再度asciinemaをbuildします．今度は成功．
$ PATH=~/.cargo/bin:$PATH cargo build --release
Finished `release` profile [optimized] target(s) in 39m 49sasciinemaのusageとversionを確認．3.0.0になっています．
$ target/release/asciinema Terminal session recorder, streamer, and player Usage: asciinema [OPTIONS] <COMMAND> Commands: record Record a terminal session [aliases: rec] stream Stream a terminal session session Record and stream a terminal session play Play back a terminal session upload Upload a recording to an asciinema server auth Authenticate this CLI with an asciinema server account cat Concatenate multiple recordings convert Convert a recording to another format help Print this message or the help of the given subcommand(s) Options: -q, --quiet Quiet mode - suppress diagnostic messages -h, --help Print help (see more with '--help') -V, --version Print version $ target/release/asciinema --version asciinema 3.0.0
asciinema 3,0を試す
ライブストリーミング機能を試す
新機能のライブストリーミング機能を試します．
ローカルとリモートが選べます．
$ target/release/asciinema stream
error: the following required arguments were not provided:
<--local [<IP:PORT>]|--remote [<STREAM-ID|WS-URL>]>
Usage: asciinema stream <--local [<IP:PORT>]|--remote [<STREAM-ID|WS-URL>]>
For more information, try '--help'.
$ target/release/asciinema stream -h
Stream a terminal session
Usage: asciinema stream [OPTIONS] <--local [<IP:PORT>]|--remote [<STREAM-ID|WS-URL>]>
Options:
-l, --local [<IP:PORT>] Stream via the local HTTP server
-r, --remote [<STREAM-ID|WS-URL>] Stream via remote asciinema server
-c, --command <COMMAND> Command to start in the session [default: $SHELL]
-I, --capture-input Enable input (keyboard) capture
--capture-env <VARS> Comma-separated list of environment variables to capture
[default: SHELL]
-t, --title <TITLE> Title of the session
--headless Headless mode - don't use the terminal for I/O
--window-size <COLSxROWS> Override session's terminal window size
--return Return the session's exit status
--log-file <PATH> Log file path
--server-url <URL> asciinema server URL
-q, --quiet Quiet mode - suppress diagnostic messages
-h, --help Print help (see more with '--help')
Examples:
asciinema stream --local
Streams a shell session via the local HTTP server listening on an ephemeral port on 127.0.0.1
asciinema stream --local 0.0.0.0:8080
Streams via the local HTTP server listening on port 8080 on all network interfaces
asciinema stream --remote
Streams via an asciinema server for public viewing
asciinema stream -l -r
Streams both locally and remotely simultaneously
asciinema stream -r --command "ping asciinema.org"
Streams execution of the ping command
asciinema stream -r <ID> -t "Live coding"
Streams via a remote server, reusing the existing stream ID and setting the stream titleまずはローカルを試します．既定値ではlocalhostしか使えないようなのでlan内で使えるようにipアドレスと適当なportを指定して起動します．
$ target/release/asciinema stream --local 10.42.0.253:9999 ::: asciinema session started ::: Live streaming at http://10.42.0.253:9999 ::: Press <ctrl+d> or type 'exit' to end $ ^d exit ::: asciinema session ended
この状態でウェブブラウザで Live streaming at の後ろのアドレスにアクセスするとasciinema端末のストリーミングが表示されます．
次はリモート．
初回は認証が必要です．authサブコマンドを実行したときに表示されるurlにアクセスして認証します．
$ target/release/asciinema auth Open the following URL in a web browser to authenticate this CLI with your asciinema.org user account: https://asciinema.org/connect/abc123de-f345-7890-1234-abc123def456 This will associate all recordings uploaded from this machine with your account (including past uploads), and enable public live streaming via asciinema.org.
リモートサーバは未指定時の既定値ではasciinema.orgが利用されます．
$ target/release/asciinema stream --remote ::: asciinema session started ::: Live streaming at https://asciinema.org/s/aBcDeFgHiJkLmNoP ::: Press <ctrl+d> or type 'exit' to end
この状態でウェブブラウザで Live streaming at の後ろのアドレスにアクセスするとasciinema.orgで端末のストリーミングが表示されます．
閲覧のみですがデモにいい感じそうです．
録画と再生
以前は録画時にリモートにアップロードすると録画ファイルは消えていましたが，asciinema 3.0ではローカルにファイルが残るようになっています．
また，録画形式もasciicast v2, asciicast v3(default), raw, txtから選べるようになっています．基本的に規定値のasciicast v3形式でいいでしょうが，セルフホスト環境などでv3非対応の場合などはv2形式にする感じでしょうか．もしv3で録画したあとv2が必要だった(もしくはその逆)の場合でも後述の変換コマンドで相互変換が可能です．
$ target/release/asciinema rec -h [4/1462]
Record a terminal session
Usage: asciinema record [OPTIONS] <FILE>
Arguments:
<FILE> Output file path
Options:
-f, --output-format <FORMAT> Output file format [default: asciicast-v3] [possible values:
asciicast-v3, asciicast-v2, raw, txt]
-c, --command <COMMAND> Command to start in the session [default: $SHELL]
-I, --capture-input Enable input (keyboard) capture
--capture-env <VARS> Comma-separated list of environment variables to capture [default:
SHELL]
-a, --append Append to an existing recording file
--overwrite Overwrite the output file if it already exists
-t, --title <TITLE> Title of the recording
-i, --idle-time-limit <SECS> Limit idle time to a given number of seconds
--headless Headless mode - don't use the terminal for I/O
--window-size <COLSxROWS> Override session's terminal window size
--return Return the session's exit status
--log-file <PATH> Log file path
-q, --quiet Quiet mode - suppress diagnostic messages
-h, --help Print help (see more with '--help')
Examples:
asciinema rec demo.cast
Records a shell session to a file
asciinema rec --command "python script.py" demo.cast
Records execution of a Python script
asciinema rec --idle-time-limit 2 demo.cast
Records with idle time capped at 2 seconds
asciinema rec --capture-input --title "API Demo" demo.cast
Records with keyboard input and sets a title
asciinema rec --append demo.cast
Continues recording to an existing file
asciinema rec demo.txt
Records as a plain-text log - output format inferred from the .txt extension録画してみる．
$ target/release/asciinema rec hello-asciinema3.0.cast ::: asciinema session started ::: Recording to hello-asciinema3.0.cast ::: Press <ctrl+d> or type 'exit' to end $ $ ^d exit ::: asciinema session ended ::: Recorded to hello-asciinema3.0.cast
録画ファイルから再生．
$ target/release/asciinema play hello-asciinema3.0.cast ::: Replaying session from hello-asciinema3.0.cast $ exit ::: Playback ended
録画ファイルのasciinema.orgへのアップロード
asciicast v1, v2, v3形式のファイルをasciinemaサーバにアップロードします．今回は既定値のasciinema.orgへアップロードします．
$ target/release/asciinema upload -h
Upload a recording to an asciinema server
Usage: asciinema upload [OPTIONS] <FILE>
Arguments:
<FILE> The path to the asciicast recording file to upload, in a supported asciicast format (v1,
v2, or v3)
Options:
--server-url <URL> asciinema server URL
-q, --quiet Quiet mode - suppress diagnostic messages
-h, --help Print help (see more with '--help')録画ファイルを指定してアップロードします．成功したら共有urlが表示されます．
$ target/release/asciinema upload hello-asciinema3.0.cast
View the recording at:
https://asciinema.org/a/OyMKojer2JRgnQbICxZ14mmKCTip | 大きなファイルはアップロードに失敗します．asciinema serverをセルフホストしたり，asciinema playerをセルフホストすることで大きなファイルを共有することが可能です． |
asciicast形式の変換
asciinema 3.0でファイル形式がasciicast v3になりました．
convertコマンドでasciicast v1, v2, v3を相互に変換可能になっています．また，rawからのasciicast形式への変換もできるようです．以前は別のサードパーティツールを使っていましたがasciinemaコマンドだけで完結できるようになったようです．
$ target/release/asciinema convert -h
Convert a recording to another format
Usage: asciinema convert [OPTIONS] <INPUT> <OUTPUT>
Arguments:
<INPUT> The source recording to convert. Can be a local file path, HTTP(S) URL for remote files,
or '-' to read from standard input. Remote URLs allow converting recordings directly
from the web without need for manual downloading. Supported input formats include
asciicast v1, v2 and v3
<OUTPUT> The output path for the converted recording. Can be a file path or '-' to write to
standard output
Options:
-f, --output-format <FORMAT> Output file format [default: asciicast-v3] [possible values:
asciicast-v3, asciicast-v2, raw, txt]
--overwrite Overwrite the output file if it already exists
-q, --quiet Quiet mode - suppress diagnostic messages
-h, --help Print help (see more with '--help')
Examples:
asciinema convert old.cast new.cast
Converts a recording to the latest asciicast format (v3)
asciinema convert demo.cast demo.txt
Exports a recording as a plain-text log - output format inferred from the .txt extension
asciinema convert --output-format raw demo.cast demo.txt
Exports as raw terminal output
asciinema convert -f txt demo.cast -
Exports as plain text to stdout
asciinema convert https://asciinema.org/a/569727 starwars.cast
Downloads a remote recording and converts it to the latest asciicast format (v3)変換してみます．
asciicast v3からv2へ変換
$ target/release/asciinema convert --output-format asciicast-v2 hello-asciinema3.0.cast hello-asciinema3.0.v2.cast
asciicast v2からv3へ変換
$ target/release/asciinema convert --output-format asciicast-v3 hello-asciinema3.0.v2.cast hello-asciinema3.0.v3.cast
変換後のファイルをplayコマンドで再生してみると問題なく再生できました．
おわりに
asciinema 3.0がリリースされました．標準でローカルに録画ファイルが残るようになったり，ストリーミング機能，ファイル形式変換機能が便利そうです．
その他asciicast v3形式に対応したplayerも試してみたいところです．
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