Technical

Tips, Tricks and Technical Information

Closed Caption Format Support

verifycc iconVarious Drastic products support closed caption decode and display.  Video I/O products such as Net-X-Code Server can capture and output closed caption information.  MediaReactor can convert closed caption formats along with the video and audio files. videoQC (Pro level and above) can decode and display both 608 and 708 captions for preview and confidence monitoring.  For some captions, default language/fonts can be set up, which are described here.

Supported Types

Here is the list of broadcast closed caption formats supported by Drastic products:

  • CEA-608
  • CEA-708
  • OP-47/RDD-08
  • Subtitles
  • MPEG-2 'user' CC (read)
  • h.264/MPEG-4/AVC1 'user' CC (read)
  • TS/MTS user and separate PID
  • MXF SMPTE 436M (read/write)
  • MXF Avid embedded CC (read)
  • GXF SMPTE 360 CC (read)
  • LXF Leitch/Harris CC (read)
  • MCC files sidebar MacCaption/PC-Caption (read/write)
  • SCC files sidebar MacCaption/PC-Caption (read/write)
  • MOV SD/HD CC tracks (read, and write with a special setup)
  • MP4 SD/HD CC tracks
  • AAF Data Track for Avid Editors (read/write)
  • N0 caption file for Grass Valley video servers (read/write)

Many subtitle caption formats are also supported for read and write:

  • Avid Caption - txt
  • Belle Nuit - stp
  • Comma Separated - csv
  • Digital Cinema 2007/2010 - xml
  • EBU Sub Titles - stl
  • Final Cut Pro - xml
  • Final Cut Pro X - xml
  • Flash - xml
  • iTunes Timed Text - txt
  • JSON (various) - json
  • QuickTime Text - txt
  • SAMI - smi
  • SMPTE 2052 - xml
  • SoftNI - sub
  • Sony DVD Architect - sub
  • Sony DVD - txt
  • SubRip - srt
  • Sub Station Alpha - ssa
  • Swift - sif
  • Timed Text - dxfp, ttml, xml
  • WebVVT - vvt
  • YouTube Annotations - xml
  • YouTube - sbv
  • YouTube Transcript - txt

Setting Defaults

Using the DDRConfig application, go to the Advanced tab and browse the XML tree to:

\VVW\Advanced\VGA\CCOP47DefaultCharacterSet

Depending on your default region, this should be set to one of the following to get the the correct fonts

  • 0 - Latin (English, French, German, Swedish, Finnish, Hungarian, Italian, Portuguese, Spanish, Czech, Slovak)
  • 1 - Latin (Polish)
  • 2 - Latin (Turkish)
  • 3 - Latin (Serbian, Croatian, Slovenian, Romanian)
  • 4 - Cyrillic (Serbian, Croatian, Russian, Bulgarian, Ukrainian) and Latin (Estonian, Latvian, Lithuanian)
  • 6 - Greek
  • 10 - Hebrew

Software Support

ccConvert

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ccConvert is a suite of tools for converting closed captions.  ccConvert supports capturing of 608 and 708 captions from live video, conversion between major closed caption types, and closed caption display and output to SDI. 

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Net-X-Code Server

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Drastic video I/O products will always capture side bar SCC (608 SD) or MCC (708 HD) text files if closed captioning is available.  SMPTE 436M is also captured, if recording a compatible MXF file type.  MOV closed caption track capture is also available, with a custom DDRConfig setup.

Video I/O products also support 608 and 708 insertion into the vertical blank area, if "Use Vertical Blank" is enabled.  Net-X-Code Server can read the MCC/SCC files, as well as MPEG-2 user closed caption (ATSC), Avid embedded, SMPTE 436 and MOV closed caption tracks.

These interfaces can also display the 608 or 708 captions to the VGA video preview area for confidence monitoring

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MediaReactor Workstation

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MediaReactor fully supports reading and writing the closed caption formats above.  All the supported formats are read when present.  SCC and MCC are always written, along with other formats when available.

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videoQC

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videoQC (Pro level and above) supports reading all the formats above, automatically.  These closed caption tracks are then decoded and can be displayed as a caption overlay on the VGA/DVI video signal.  This provides an incredibly cost effective closed caption monitor software. 

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