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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.

./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.

• 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 athttps://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 -