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Subtitling
Workflows

Subtitle Insertion

Vcodes’ subtitling technology gives broadcasters exceptional versatility in delivering video content to broad and diverse audiences. 
Fully integrated into automated workflows, the system handles every step of the subtitling process — from monitoring watch folders and validating subtitle file compatibility to precise time alignment, format conversion, and seamless insertion — ensuring efficient, end-to-end automation.

Subtitle Tracks

In traditional MPEG-TS CableLabs VOD workflows, DVB subtitles and Closed Captions (CC) are embedded as distinct subtitle tracks, independent of the video stream. 
This approach allows for multi-language support within a single file and gives viewers the flexibility to toggle subtitles on or off. 
For modern streaming formats like MPEG-DASH and HLS, vCoder seamlessly integrates TTML and WebVTT subtitle tracks, ensuring compatibility across all standard ISO languages and delivering a smooth viewing experience across platforms.

Overlaid Subtitles

Overlaid subtitles — also known as open or burnt-in subtitles — are directly embedded into the video image during encoding. 
Because they become a permanent part of the visual stream, they’re compatible with any video format and require no separate subtitle track for playback.

Automatic Subtitle Ingest and Timecode Syncing

Vcodes can ingest subtitle files directly from your Media Asset Management system, ensuring a smooth and automated integration. 

Each file undergoes compliance checks, is converted to the appropriate output format, and precisely synchronized with the video timecode.

Multilingual subtitles are identified through naming conventions and support a wide range of industry-standard text and binary formats — including EBU, 890, PAC, STL, SRT, and others. 

Based on the output format, Vcodes intelligently assigns the correct subtitle workflow: for transport streams, individual language tracks are created with accurate language descriptors; for formats limited to burnt-in subtitles (also known as overlay or open subtitles), multiple output files are automatically generated, each featuring the corresponding language embedded directly into the video.

Powerful Subtitling Control

Unlike competing products which provide only basic subtitle insertion controls, Vcodes lets you fully control all aspects of the subtitle insertion process, including:

  • Timecode sync, automatic to the video file or manual
  • Supports all known languages
  • Automatic detection of special attributes in supporting formats, like blackboxed subtitles, superimposed or positioning
  • Separate controls for superimposed subtitles
  • Full character attributes control
  • Accurate positioning, line spacing and aspect ratio control
  • Colors and opacity