DIGIT SRT Preview

Subtitle files are easy to generate and easy to ship, and the gap between those two things is where DIGIT SRT Preview lives. It doesn't make captions - the other DIGIT SRT nodes do that - it checks the ones you already have and tells you what's wrong before you deliver. Paste SRT text or point it at a file, and it runs the standard broadcast QA checks and hands you a summary plus a list of warnings.

This is the node you drop in the pipeline after SRT Maker or SRT From Video (or after any tool, honestly), exactly the way you'd put a QC gate before a render leaves the farm. It's a ten-second sanity check that catches the embarrassing stuff.

What it checks

• Overlapping timestamps - an entry that starts before the previous one ends. The classic machine-transcription bug.
• Long lines - entries exceeding max_chars_per_line, default 42, which is the Netflix/broadcast standard.
• Too many lines - more than two lines of text in a single entry.
• Reading speed - characters per second above max_cps, default 20 (Netflix's adult standard; children's content should be 17). A subtitle that's on screen too briefly to read is a subtitle that fails its only job.
• Bad timing - entries with zero or negative duration.

Each check can be disabled by setting its threshold to 0.

The inputs

• srt_input - paste the SRT text directly.
• srt_filepath - a path to an SRT file instead; overrides the pasted text if both are set.
• max_chars_per_line and max_cps - the two thresholds above.

Outputs: summary (a formatted block like Entries: 47 / Duration: 2m 34s / Warnings: 3), entry_count (the integer, handy for a workflow counter or a conditional), and warnings (one per line, empty when the file is clean).

How it works and where it fits

It's a pure parser - no API calls, no credentials, no network. It reads the SRT, walks every entry, applies the checks, and counts. Because it's deterministic and offline, it also makes a nice non-destructive check node: leave it wired up at the end of a captioning workflow and it'll flag problems on every run without touching anything. If it finds issues, fix them with SRT Tools (which can merge, renumber, re-time, and re-post-process) and re-run Preview to confirm.

Install is just the pack: ComfyUI Manager, search comfyui-digit, restart. No model downloads, no API keys, no GCP setup - this is one of the rare DIGIT nodes that works completely offline. If you do subtitle work in ComfyUI at all, this is the cheapest QC you'll ever add.