Warnings and limits
Real-time QC (or QA)
Projects can be configured with captioning constraints, such as reading speed, caption length, duration, and timing rules. CaptionHub continuously checks your captions against these limits and immediately flags any issues it detects.
If any warnings or errors are present, the Real-time QC button will appear in orange or red. The affected captions will also be highlighted within the editor, timeline, or spreadsheet view, depending on the type of issue detected.
Clicking the Real-time QC button opens a list of all detected issues, along with a plain-language explanation of what needs to be corrected. Each issue includes a link that takes you directly to the affected caption, making it easy to review and resolve problems quickly.
Filtering by QC issues
Limit constraint severities
Each limit can be set up with a unique severity. If real-time validation is left unchecked, this means that it’s only an instructive value and will be used by automatic transcriptions to inform the style of captions.
If validation is enabled, setting it to Error means that any captions that fail validation can’t be approved. Setting this to Warning means that CaptionHub will let the user approve captions, but will also warn them that validation has failed.
You can choose to apply limits to Track 1 only or to both Track 1 and Track 2. Selecting Apply limits to T1 only disables validation for the second caption track, while Apply limits to T1 & T2 enables validation for both.
You can define the severity of the limits on your team’s caption settings and define the specific values on the language profile.
The limits that CaptionHub checks for are:
Character length per line
The maximum number of characters in a single line of a caption. (Captions may have one or two lines, depending on the line count limit. If you exceed the allowed amount, the character count for that line will turn red.
Note: In CJK captions (Chinese, Japanese, and Korean), characters from the Latin alphabet are counted as having half the value of a CJK character.
Number of lines
The number of lines in a single caption. If this is exceeded, the entire caption box will turn red. Careful: an extra carriage return (new line) at the end of the caption will add an extra line, which might cause errors.
Caption duration
The minimum or maximum time a caption can appear on screen. The original caption set has been set up with all captions at least the correct length. Should you alter the timings, any caption that lasts less than the minimum duration or longer than the maximum duration will turn red in the timeline.
Frame gaps
CaptionHub can be configured to warn the user if captions are too close together, usually according to a broadcast standard. A minimum frame gap can be configured, and CaptionHub will enforce this where possible and warn the user if not.
Reading speed
CaptionHub has optional controls to enforce a maximum reading speed for your captions. Reading speed can be defined as either Characters Per Second (CPS), Words Per Minute (WPM), or both.
Presence of metadata
Some workflows require video metadata – title & description – to be translated. If "Require metadata" is enabled in Team Settings, then captions can only be approved if these fields have been filled in.