[GH-ISSUE #719] [v3] Bug: Piping stdin to `rec` command fails (worked in v2) #974

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opened 2026-03-15 11:11:26 +03:00 by kerem · 2 comments

kerem commented

2026-03-15 11:11:26 +03:00

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Originally created by @lunrenyi on GitHub (Dec 11, 2025).
Original GitHub issue: https://github.com/asciinema/asciinema/issues/719

Pre-submission checks

I have searched existing issues and this bug has not been reported yet
This is a bug report for asciinema CLI (not player or server)

Bug Description

Piping commands to asciinema rec for automation worked perfectly in v2.4.0 but fails in v3.0.1.

Steps to Reproduce

printf "echo hhh\nexit\n" | asciinema rec demo.cast

Expected Behavior

v2.4.0: Records successfully and exits.
v3.0.1: Fails.The command hangs not capture the input

Operating System

macOS 24.6.0

asciinema CLI Version

3.0.1

Installation Method

Downloaded binary

Terminal Information

Shell: zsh 5.9 (arm64-apple-darwin24.0)

Additional Context

No response

Originally created by @lunrenyi on GitHub (Dec 11, 2025). Original GitHub issue: https://github.com/asciinema/asciinema/issues/719 ### Pre-submission checks - [x] I have searched existing issues and this bug has not been reported yet - [x] This is a bug report for asciinema CLI (not player or server) ### Bug Description Piping commands to `asciinema rec` for automation worked perfectly in **v2.4.0** but fails in **v3.0.1**. ### Steps to Reproduce ```bash printf "echo hhh\nexit\n" | asciinema rec demo.cast ``` ### Expected Behavior * **v2.4.0**: Records successfully and exits. * **v3.0.1**: Fails.The command hangs not capture the input <img width="463" height="265" alt="Image" src="https://github.com/user-attachments/assets/8190d786-bcf9-4454-a732-2a9451244619" /> ### Operating System macOS 24.6.0 ### asciinema CLI Version 3.0.1 ### Installation Method Downloaded binary ### Terminal Information - Shell: zsh 5.9 (arm64-apple-darwin24.0) ### Additional Context _No response_

kerem commented

2026-03-15 11:11:32 +03:00

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@lunrenyi commented on GitHub (Dec 11, 2025):

I'm wondering if there is a plan to support this non-interactive use case in v3, or if there is a recommended workaround for automating recordings?

Thanks!

@lunrenyi commented on GitHub (Dec 11, 2025): I'm wondering if there is a plan to support this non-interactive use case in v3, or if there is a recommended workaround for automating recordings? Thanks!

kerem commented

2026-03-15 11:11:37 +03:00

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@ku1ik commented on GitHub (Mar 1, 2026):

I'm still trying to figure out whether it's worth adding this to v3. Btw, I'm planning to implement an RPC mechanism for controlling the recorder (sending input, setting markers, etc), which could potentially replace piping to stdin as a way of automation.

@ku1ik commented on GitHub (Mar 1, 2026): I'm still trying to figure out whether it's worth adding this to v3. Btw, I'm planning to implement an RPC mechanism for controlling the recorder (sending input, setting markers, etc), which could potentially replace piping to stdin as a way of automation.