[FFmpeg-user] HLS ABR packaging from multiple MPEGTS sources

[Denis Lemire]

Hello,

I'm trying to use FFmpeg to package three MPEGTS streams that are the same
source at different resolutions, bitrates and overall quality profile into
an ABR HLS feed.

I can make it work using an ffmpeg process per MPEGTS input / HLS output
and then manually creating a playlist but I'm trying to figure out if
there's an elegant way to do it with a single process or if there are other
advantages in doing so.

I was trying something like:

/usr/local/bin/ffmpeg \
-i 'udp://239.x.x.127:1241' -i 'udp://239.x.x.127:1244 -i
'udp://239.x.x.127:1247' \
-map '#0:0' -map '#0:1' -codec copy -f hls low.m3u8 \
-map '#1:0' -map '#1:1' -codec copy -f hls med.m3u8 \
-map '#2:0' -map '#2:1' -codec copy -f hls high.m3u8


When attempting to run it this way I get something like:

Input #0, mpegts, from 'udp://239.x.x.127:1241':
  Duration: N/A, start: 63021.092978, bitrate: N/A
  Program 1
    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(progressive), 512x288 [SAR 1:1 DAR 16:9], Closed Captions, 59.94
fps, 59.94 tbr, 90k tbn, 119.88 tbc
    Stream #0:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 84 kb/s
    Stream #0:2[0x102](afr): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 62 kb/s

Input #1, mpegts, from 'udp://239.x.x.127:1244':
  Duration: N/A, start: 63026.170311, bitrate: N/A
 Program 1
    Stream #1:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
yuv420p(progressive), 896x504 [SAR 1:1 DAR 16:9], Closed Captions, 59.94
fps, 59.94 tbr, 90k tbn, 119.88 tbc
    Stream #1:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 125 kb/s
    Stream #1:2[0x102](afr): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 133 kb/s

Input #2, mpegts, from 'udp://239.x.x.127:1247':
  Duration: N/A, start: 63031.247644, bitrate: N/A
  Program 1
    Stream #2:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94
fps, 59.94 tbr, 90k tbn, 119.88 tbc
    Stream #2:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 127 kb/s
    Stream #2:2[0x102](afr): Audio: aac (LC) ([15][0][0][0] / 0x000F),
48000 Hz, stereo, fltp, 126 kb/s

[mpegts @ 0x55bea4125380] Invalid stream specifier: #0:0.
    Last message repeated 5 times
Stream map '#0:0' matches no streams.
To ignore this, add a trailing '?' to the map.

Am I missing something obvious in terms of mapping multiple MPEGTS streams
into multiple HLS outputs... Is the approach I'm attempting valid?