Playback Speed And Timeline Control

I got tired of sharing AI demos with terminal screenshots or screen recordings.Claude Code already stores full session transcripts locally as JSONL files. Those logs contain everything: prompts, tool calls, thinking blocks, and timestamps.I built a small CLI tool that converts those logs into an int

Unique: Applies standard video player UX (play/pause/seek/speed) to code sessions, making session review feel natural to users familiar with video playback rather than requiring custom navigation commands

vs others: More accessible than command-line session logs because familiar video controls reduce the learning curve and allow non-technical viewers to navigate sessions intuitively

via “interactive-replay-timeline-scrubbing”

[Game data replay](https://huggingface.co/spaces/cr7-gjx/Suspicion-Agent-Data-Visualization)

Unique: Uses keyframe-indexed replay architecture enabling O(log n) seek time regardless of replay length, with delta-frame decompression for non-keyframe positions, avoiding full replay re-parsing on each seek operation

vs others: Achieves frame-accurate seeking with sub-second latency on large replays, whereas naive implementations require sequential parsing from the last keyframe (linear seek time)

via “playback speed control”

via “multi-scale temporal sonification with playback rate control”

Unique: Implements simple time-stretching by adjusting playback rate at the HTMLMediaElement level rather than performing pitch-correction, keeping implementation lightweight but accepting the pitch-shift tradeoff. This design prioritizes responsiveness over audio fidelity.

vs others: More intuitive than academic sonification tools that require manual re-synthesis at different tempos; simpler than professional audio workstations with advanced time-stretching algorithms (which would add significant latency).

via “narration speed adjustment”

via “playback speed and audio effect controls”

Unique: Implements real-time playback speed adjustment without pitch correction, maintaining natural voice characteristics at variable speeds — simpler than Spotify's time-stretching but sufficient for speech-heavy content

vs others: More granular speed control than Audible (0.5x-2.0x vs. 0.75x-1.25x) and more accessible audio effects than basic players; comparable to Pocket Casts' playback controls but simpler effect suite

via “audio preview and playback”

via “video editing and pacing control”

via “video speed and slow-motion control”

via “video speed and slow-motion adjustment”

via “real-time video preview with scrubbing and playback control”

Unique: Preview rendering uses Canvas 2D layer compositing with frame rate capping at 30fps to maintain browser responsiveness, rather than decoding full video frames which would consume excessive memory

vs others: More responsive than DaVinci Resolve's preview for simple edits because it uses lightweight Canvas rendering, but less accurate than Premiere Pro's preview which renders at full resolution and frame rate