84 lines
2.5 KiB
Markdown
84 lines
2.5 KiB
Markdown
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# Technik PCS 3.0
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**Legende:**
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---
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<img src="/img/streams/pcs3-legend.svg" />
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---
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<img src="/img/streams/pcs3-graph.svg" />
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**Bekannte Latenzen:**
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| von | bis | Latenz |
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| -------- | -------- | -------- |
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| `Übersetzer*in` | `/audio` | ca. 1s |
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| `/audio` | `OBS` | ca. 4-5s |
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[1] Service: `rec-<CHANNEL>.service`
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```
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.venv/bin/python3 -m c3lingo_mumble.recv_stdout mumble.octycs.eu <CHANNEL> | \
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ffmpeg -re -fflags nobuffer -probesize 32 -f s16le -ac 1 -ar 48000 -i pipe:0 \
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-filter_complex pan=7.1|BL=c0[a] -map [a] -c:a aac -ac 8 -ar 44100 \
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-f flv rtmp://localhost:1935/audio/<CHANNEL>
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```
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[2] Datei: `/opt/forwarder.sh`
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```
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ffmpeg -fflags nobuffer \
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-i rtmp://localhost:1935/input/$1 -c:v copy \
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-filter_complex "[a:0]pan=7.1|FL=c0|FR=c0" -c:a aac -ac 8 -ar 44100 \
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-f flv rtmp://localhost:1935/output/$1
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```
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[3] (Bisher nur zwei Sprachen) Datei: `/opt/splitter.sh`
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```
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ffmpeg -re -fflags nobuffer \
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-i rtmp://localhost:1935/split_in/live \
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-filter_complex \
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"[0:a]pan=stereo|c0=c0|c1=c1,aresample=async=1000[a0];
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[0:a]pan=stereo|c0=0.02*c0+0.98*c4|c1=0.02*c1+0.98*c4,aresample=async=1000[a1]" \
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-map 0:v -copyts -start_at_zero -vcodec copy \
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-map [a0] -c:a aac -ac 2 \
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-f flv rtmp://a.rtmp.youtube.com/live2/<Stream-Key-DE> \
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-map 0:v -copyts -start_at_zero -vcodec copy \
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-map [a1] -c:a aac -ac 2 \
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-f flv rtmp://a.rtmp.youtube.com/live2/<Stream-Key-EN>
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```
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[4] Die Streams von `/input` und `/output` sind funktional gleich, nur dass das Video bei `/output` 8 Kanäle hat und deswegen in OBS alle Kanäle angezeigt werden. Das ist nur relevant, falls die Kanäle in OBS anders gemixt werden mit dem rematrix Plugin. ~~Im Zweifel `/input` nehmen.~~
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Es scheint OBS hat Probleme mit Mono input im 7.1 Modus, deswegen besser `/output` nehmen. (Sollte das nicht möglich sein: unter `Advanced Audio Properties` das Häkchen bei `Downmix to Mono` aktivieren.)
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### Z.B. dann so konfiguriert in Nginx RTMP
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```nginx
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application input {
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live on;
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exec /opt/forwarder.sh $name;
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exec_kill_signal term;
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record all;
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record_path /opt/rec;
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record_suffix -%Y-%m-%dT%T.flv;
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}
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```
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und dann in `/opt/forwarder.sh`:
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```bash
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#!/bin/bash
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on_die() {
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pkill -KILL -P $$
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}
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trap 'on_die' TERM
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ffmpeg -fflags nobuffer \
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-i rtmp://localhost:1935/input/$1 -c:v copy \
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-filter_complex "[a:0]pan=7.1|FL=c0|FR=c0" -c:a aac -ac 8 -ar 44100 \
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-f flv rtmp://localhost:1935/output/$1 &
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wait
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```
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