Create videostaff.md

instructions/fosdem2021/videostaff.md

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+## Diagnostics
+From ingestion to website, you want to check where things go wrong
+- Is the prerecorded file there?
+
+  ```ssh root@<track>-vocto.video.fosdem.org ls -lh /mnt/video/*.mp4```
+- Is the prerecorded file a sensible length?
+
+  ```ssh root@<track>-vocto.video.fosdem.org ffprobe /mnt/video/<penta_id>.mp4 |& grep Duration```
+- Are all talks for this room properly scheduled?
+
+```ssh root@<track>-vocto.video.fosdem.org systemctl list-timers```
+- Is the output of the voctomix mixer nominal?
+
+  ```mpv http://<track>-vocto.video.fosdem.org:8899 checks the output of the vocto mixer for the room```
+- Is the public stream output nominal?
+
+  ```mpv https://stream.fosdem.org/<track>.m3u8