philburr / atsc

Standalone ATSC encoder

ATSC 8VSB Software Defined Modulator

Build Status

Purpose

This software is an ATSC 8VSB modulator for SoapySDR compatible, TX capable software defined radios. The actual modulator is a library without external dependencies, other than a C++17 compiler. It requires as input an ATSC mpeg2ts stream. The mpeg2ts stream must at a minimum be encoded at a mux rate of 19393000. See examples below for exmples using FFmpeg.

Usage

./atsc_encoder [OPTION...] filename

-d, --driver arg     SoapySDR Driver String (default: "hackrf")
-f, --frequency arg  Transmit Frequency (default: 473000000)
-g, --gain arg       Gain (dB) (default: 54)

Filename should be a file with properly formatted mpeg2ts atsc stream or a single dash (-) to read from stdin.

Examples

• Broadcasting preencoded TS:

  ./atsc_encoder preencoded.ts
  

• Broadcasting trancoded video on ATSC channel 20:

  ffmpeg -i test.mkv -c:v mpeg2_vaapi -acodec eac3 -b:a:0 384k -ar 48k -ac 2 -muxrate 19393000 -f mpegts - | ./atsc_encoder -f 509e6 -
  

• Broadcasting with ATSC metadata. This requires FFmpeg patches that have not yet been merged upstream. They are available at https://github.com/philburr/FFmpeg

  ffmpeg -i test.mkv -c:v mpeg2_vaapi -acodec eac3 -b:a:0 384k -ar 48k -ac 2 -muxrate 19393000 -metadata atsc_name=KOOL -metadata atsc_channel=14.1 -f mpegts - | ./atsc_encoder -