[FFmpeg-user] decklink SDI output with subtitles

Izhar Marinov izhar.m at novelsat.com
Thu May 30 17:57:18 EEST 2024

I am trying to decode mpeg TS over UDP with subtitle stream into SDI port.


ffmpeg -i "udp://" -map 0:i:0x7d1 -map 0:i:0xbb9 -map 0:i:0x1389  -teletext_lines all -c:v v210 -f decklink 88:02a07762:00000000

if I don’t use the map command, the video and audio are working fine but the subtitle stream is ignored, if I specify the subtitles stream (PID 0x1389 in this example), I get the following error:

Input #0, mpegts, from 'udp://':
  Duration: N/A, start: 43965.121844, bitrate: N/A
  Program 1
  Stream #0:0[0x7d1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg, top first), 720x576 [SAR 16:11 DAR 20:11], 25 fps, 50 tbr, 90k tbn
  Stream #0:1[0xbb9](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 384 kb/s (clean effects)
  Stream #0:2[0xfa1](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 384 kb/s (clean effects)
  Stream #0:3[0x1389](spa,spa,spa,spa,spa,spa,spa): Subtitle: dvb_teletext (libzvbi_teletextdec) ([6][0][0][0] / 0x0006), 492x250
[sost#0:2 @ 0x55b721f91b40] Automatic encoder selection failed Default encoder for format decklink (codec eia_608) is probably disabled. Please choose an encoder manually.
[sost#0:2 @ 0x55b721f91b40] Error selecting an encoder


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