DJI FPV SRT converter

This is a little tool to re-format or convert SRT files generated by the DJI FPV System for on-google recordings. You run the script with a .srt file to create an .ass or .ssa file which can be viewed via VLCPlayer or used to encode into the video using handbrake or ffmpeg.

Dependencies:

• basic perl v5x+, onboard on most Linux/OSX systems
• for Windows use cygwin (select perl package on install) or strawberr-yperl

Features:

• reformat and filter the default Subtitle-OSD using SSA/ASS format
• optional colorized bar for bitrate
• adjustable size in percent
• adjustable colorization
• csv output without units for graphs and analysis

Configuration:

1. open the convertsrt.pl file in your favorite editor
2. enter values for ALIGN,MARGIN,FONTSIZE,OUTPUTFORMAT
3. adjust OUTPUTTEMPLATE as you like
   • each field must be specified between {< >}
   • available fields are:
     • signal
     • ch
     • flightTime
     • uavBat
     • glsBat
     • uavBatCells
     • glsBatCells
     • delay
     • bitrate
     • rcSignal
     • start_time
     • end_time

• for ASS:
  • use the last bit of the example
  • \N can be used as linebreak
  • set BITRATE _BAR _ENABLE to 1 if you want to have a progress-bar
    • BITRATE _BAR _ENABLE 2 will create a shorter bar
  • optionally: change BITRATE _BAR _COLORS, first color will be background, follwed by the colors to gradient
  • more optionally: adjust or replace the complete $header for more options, easiest created with Aegisub
• for CSV:
  • see example or OUTPUTTEMPLATE
  • set BITRATE_BAR_ENABLE to 0

Usage:

• perl convertsrt.pl DJIG0006.srt

• perl convertsrt.pl DJIG0006.srt DJIG0006.ass

• perl convertsrt.pl DJIG0006.srt DJIG0006.ssa

• perl convertsrt.pl DJIG0006.srt DJIG0006.csv

Examples:

Reference:

• http://www.tcax.org/docs/ass-specs.htm
• https://en.wikipedia.org/wiki/SubStation_Alpha
• AndyRC: FREE DJI FPV HD Format And HardCode OSD